- A 58-year-old man with a 30-pack-year smoking history presents with 40 minutes of crushing substernal chest pain radiating to the jaw. He is diaphoretic. ECG shows 3-mm ST elevations in leads V2 through V4. The cardiac catheterization lab is available on site within 30 minutes. What is the most appropriate reperfusion strategy?
- Primary percutaneous coronary intervention
- Fibrinolytic therapy with alteplase
- Coronary artery bypass grafting within the hour
- Exercise stress testing before any intervention
Correct answer: Primary percutaneous coronary intervention
Primary percutaneous coronary intervention is correct because this patient has a STEMI (anterior ST elevations) and a catheterization-capable facility can achieve device time well within the 90-minute goal, making primary PCI superior to fibrinolytics. Fibrinolysis is reserved for when timely PCI is unavailable. Emergent bypass is not the first-line reperfusion approach, and stress testing is contraindicated in an active STEMI.
- A 62-year-old woman arrives at a rural hospital with 50 minutes of chest pain and 2-mm ST elevations in leads II, III, and aVF. The nearest PCI-capable center is a 3-hour transfer away. She has no contraindications to thrombolytics. What is the best immediate reperfusion treatment?
- Schedule elective angiography in 1 week
- Fibrinolytic therapy with tenecteplase
- Begin oral metoprolol and observe
- Administer nitroglycerin paste and discharge
Correct answer: Fibrinolytic therapy with tenecteplase
Fibrinolytic therapy with tenecteplase is correct because this is an inferior STEMI presenting within the time window, and when primary PCI cannot be delivered within 120 minutes, prompt fibrinolysis restores perfusion fastest. Delaying angiography forgoes timely reperfusion. Beta-blockers and nitrates are adjuncts, not reperfusion therapy, and discharge would be dangerous.
- A 55-year-old man presents with chest pressure at rest. His initial ECG shows 1-mm ST depressions in the lateral leads, and a high-sensitivity troponin returns elevated and rising. He is hemodynamically stable and pain-free after nitroglycerin. What is the most appropriate management?
- Immediate fibrinolytic therapy
- Reassurance and outpatient follow-up
- Dual antiplatelet therapy, anticoagulation, and angiography within 24 hours
- Emergency pericardiocentesis
Correct answer: Dual antiplatelet therapy, anticoagulation, and angiography within 24 hours
Dual antiplatelet therapy, anticoagulation, and angiography within 24 hours is correct because the elevated troponin with ischemic ECG changes defines NSTEMI; an early invasive strategy within 24 hours is recommended for high-risk patients. Fibrinolytics are not indicated in NSTEMI and may cause harm. Discharge ignores an evolving infarct, and pericardiocentesis treats tamponade, not ACS.
- A 49-year-old man with a STEMI is being prepared for the catheterization lab. Which medication combination is most appropriate to give immediately before percutaneous coronary intervention?
- Aspirin alone with no anticoagulation
- Warfarin plus clopidogrel
- A statin alone
- Aspirin plus a P2Y12 inhibitor plus an anticoagulant
Correct answer: Aspirin plus a P2Y12 inhibitor plus an anticoagulant
Aspirin plus a P2Y12 inhibitor plus an anticoagulant is correct because dual antiplatelet therapy with periprocedural anticoagulation reduces stent thrombosis and ischemic events during primary PCI. Aspirin alone provides inadequate platelet inhibition. Warfarin has no role in acute reperfusion, and a statin, while indicated long-term, is not the periprocedural antithrombotic regimen.
- A 70-year-old man develops a new harsh holosystolic murmur and acute pulmonary edema 5 days after an anterior STEMI. An echocardiogram shows a left-to-right shunt at the interventricular septum. What is the most likely complication?
- Ventricular septal rupture
- Pulmonary embolism
- Aortic dissection
- Constrictive pericarditis
Correct answer: Ventricular septal rupture
Ventricular septal rupture is correct because a new holosystolic murmur with a left-to-right interventricular shunt and acute decompensation several days after an MI is the hallmark of post-infarction septal rupture. Pulmonary embolism does not cause a septal shunt, aortic dissection produces a different murmur and presentation, and constrictive pericarditis is a chronic process.
- A 64-year-old woman 3 days after an inferior MI develops sudden hypotension, jugular venous distention, and clear lung fields. Her ECG had shown ST elevations in II, III, and aVF. What is the most appropriate next step?
- Give a high-dose intravenous diuretic
- Administer an intravenous fluid bolus
- Start high-dose nitroglycerin infusion
- Begin urgent hemodialysis
Correct answer: Administer an intravenous fluid bolus
Administer an intravenous fluid bolus is correct because hypotension with clear lungs and elevated neck veins after an inferior MI suggests right ventricular infarction, which is preload-dependent and treated with volume. Diuretics and nitrates reduce preload and worsen the hypotension. Dialysis has no role in this hemodynamic picture.
- A 53-year-old man is diagnosed with NSTEMI. Which of the following findings would most strongly favor an immediate (within 2 hours) invasive strategy rather than an early invasive strategy?
- A single mildly elevated troponin
- Resolved symptoms after nitroglycerin
- Refractory chest pain with hemodynamic instability
- A normal ejection fraction
Correct answer: Refractory chest pain with hemodynamic instability
Refractory chest pain with hemodynamic instability is correct because ongoing ischemia or hemodynamic/electrical instability defines a very-high-risk NSTEMI warranting immediate angiography. A single mild troponin elevation, symptom resolution, and preserved ejection fraction all suggest lower acuity that can be managed with an early rather than immediate invasive approach.
- A 60-year-old man with acute chest pain has an ECG showing ST elevation in leads V1 to V6, I, and aVL. This pattern is most consistent with occlusion of which coronary vessel?
- Right coronary artery
- Posterior descending artery
- Left circumflex artery
- Left anterior descending artery
Correct answer: Left anterior descending artery
Left anterior descending artery is correct because extensive anterior precordial ST elevation involving the anterolateral leads localizes to the LAD territory. The right coronary artery supplies the inferior wall (II, III, aVF), the posterior descending artery produces posterior changes, and the circumflex typically affects the lateral or posterolateral leads.
- A 57-year-old man presents with chest pain and is found to have a STEMI. He reports that 6 months ago he had a gastrointestinal bleed requiring transfusion and currently has melena. Reperfusion with which strategy is most appropriate?
- Primary percutaneous coronary intervention
- Full-dose fibrinolytic therapy
- Therapeutic-dose enoxaparin with no PCI
- High-intensity anticoagulation without reperfusion
Correct answer: Primary percutaneous coronary intervention
Primary percutaneous coronary intervention is correct because active gastrointestinal bleeding is an absolute contraindication to fibrinolysis, so mechanical reperfusion with primary PCI is the safest way to open the artery. Full-dose lytics would risk catastrophic hemorrhage. Anticoagulation alone does not achieve reperfusion in STEMI.
- A patient with an acute STEMI is given sublingual nitroglycerin for chest pain. Which recent medication exposure would make nitroglycerin administration most dangerous?
- Acetaminophen taken for a headache
- A phosphodiesterase-5 inhibitor taken for erectile dysfunction
- A daily multivitamin
- An inhaled albuterol dose
Correct answer: A phosphodiesterase-5 inhibitor taken for erectile dysfunction
A phosphodiesterase-5 inhibitor taken for erectile dysfunction is correct because combining nitrates with sildenafil-class drugs causes profound, potentially fatal hypotension. Acetaminophen, multivitamins, and inhaled albuterol do not have this dangerous synergistic vasodilatory interaction with nitroglycerin.
- A 66-year-old man is admitted with NSTEMI and started on appropriate antithrombotic therapy. Beyond antiplatelet agents, which medication has the strongest evidence for reducing mortality and should be started during the hospitalization unless contraindicated?
- A proton pump inhibitor
- A long-acting nitrate
- A high-intensity statin
- An oral calcium channel blocker
Correct answer: A high-intensity statin
A high-intensity statin is correct because early high-intensity statin therapy stabilizes plaque and reduces recurrent events and mortality after acute coronary syndrome. Proton pump inhibitors protect the gut but do not reduce cardiovascular mortality, nitrates relieve symptoms without a clear survival benefit, and calcium channel blockers are not first-line mortality agents.
- A 72-year-old woman presents with epigastric discomfort, nausea, and dyspnea but no classic chest pain. She is diabetic. Her ECG shows ST elevations in the inferior leads. Which feature of her presentation is most important to recognize?
- Epigastric pain rules out a cardiac cause
- Absence of chest pain excludes STEMI
- ST elevation in this setting is benign
- Diabetic and elderly patients often have atypical or silent infarct symptoms
Correct answer: Diabetic and elderly patients often have atypical or silent infarct symptoms
Diabetic and elderly patients often have atypical or silent infarct symptoms is correct because autonomic neuropathy and age can blunt classic chest pain, so an inferior STEMI may present with nausea, epigastric pain, or dyspnea. Epigastric pain does not exclude cardiac ischemia, lack of chest pain does not rule out STEMI, and the ST elevations are clearly pathologic.
- A 59-year-old man with a STEMI undergoes successful primary PCI with drug-eluting stent placement. Which discharge regimen regarding antiplatelet therapy is most appropriate?
- Aspirin indefinitely plus a P2Y12 inhibitor for at least 12 months
- Aspirin for 1 week only
- A P2Y12 inhibitor alone with no aspirin
- Warfarin in place of antiplatelet agents
Correct answer: Aspirin indefinitely plus a P2Y12 inhibitor for at least 12 months
Aspirin indefinitely plus a P2Y12 inhibitor for at least 12 months is correct because dual antiplatelet therapy after drug-eluting stenting for ACS prevents stent thrombosis, with aspirin continued lifelong. Stopping aspirin early, using a P2Y12 inhibitor alone, or substituting warfarin would increase ischemic stent-related risk.
- A 61-year-old man develops chest pain and ST elevations; he is taken for angiography, which shows no obstructive coronary disease, but ventriculography reveals apical ballooning with a hypercontractile base following the recent death of his spouse. What is the most likely diagnosis?
- Acute plaque rupture STEMI
- Stress (takotsubo) cardiomyopathy
- Prinzmetal variant angina
- Acute pericarditis
Correct answer: Stress (takotsubo) cardiomyopathy
Stress (takotsubo) cardiomyopathy is correct because apical ballooning with non-obstructive coronaries after intense emotional stress is the classic catecholamine-mediated picture mimicking STEMI. Plaque rupture would show an occluded vessel, variant angina causes transient vasospasm, and pericarditis produces diffuse ST elevation without wall-motion ballooning.
- A 54-year-old man with crushing chest pain has an ECG showing ST depression in V1 to V3 with tall R waves and upright T waves. Posterior leads (V7 to V9) show ST elevation. What is the correct interpretation?
- Benign early repolarization
- Pulmonary embolism pattern
- Posterior STEMI requiring reperfusion
- Left bundle branch block
Correct answer: Posterior STEMI requiring reperfusion
Posterior STEMI requiring reperfusion is correct because anterior ST depression with tall R waves that becomes ST elevation on posterior leads indicates a true posterior infarction, an ST-elevation equivalent needing reperfusion. Early repolarization and PE patterns do not show posterior-lead elevation, and this ECG does not describe a bundle branch block.
- A 50-year-old man arrives with an acute STEMI. While the catheterization team is mobilized, which initial medication should be given immediately to all eligible ACS patients unless contraindicated?
- Intravenous heparin bolus without antiplatelet therapy
- A loop diuretic
- Intravenous magnesium
- Chewable aspirin
Correct answer: Chewable aspirin
Chewable aspirin is correct because immediate aspirin reduces mortality in acute coronary syndrome and should be given to every eligible patient at first medical contact. Anticoagulation is added but not in place of aspirin, loop diuretics treat congestion rather than the thrombus, and routine magnesium is not indicated.
- A 68-year-old man 2 hours after a large anterior STEMI suddenly loses consciousness; the monitor shows a wide, rapid, regular ventricular rhythm with no palpable pulse. What is the most appropriate immediate intervention?
- Immediate unsynchronized defibrillation
- Synchronized cardioversion
- Intravenous adenosine
- Carotid sinus massage
Correct answer: Immediate unsynchronized defibrillation
Immediate unsynchronized defibrillation is correct because pulseless ventricular tachycardia is a shockable cardiac arrest rhythm requiring immediate defibrillation and CPR. Synchronized cardioversion is for unstable patients with a pulse, adenosine treats supraventricular tachycardia, and carotid massage has no role in pulseless arrest.
- A 56-year-old man with an NSTEMI is found to have a hemoglobin of 7.2 g/dL from chronic anemia. Which principle should guide his transfusion management?
- Transfuse aggressively to a hemoglobin above 12 g/dL
- Use a restrictive transfusion strategy, transfusing for symptoms or a low threshold
- Withhold all transfusion regardless of symptoms
- Transfuse only whole blood
Correct answer: Use a restrictive transfusion strategy, transfusing for symptoms or a low threshold
Use a restrictive transfusion strategy, transfusing for symptoms or a low threshold is correct because liberal transfusion targets have not improved and may worsen outcomes in most cardiac patients, so a restrictive approach is generally preferred. Aggressive over-transfusion and rigid withholding of needed blood are both inappropriate, and whole blood is not the standard product.
- A 47-year-old cocaine user presents with chest pain and ST-segment changes. Which class of medication should generally be avoided as initial monotherapy because of the risk of unopposed alpha stimulation?
- Benzodiazepines
- Aspirin
- Beta-blockers
- Nitroglycerin
Correct answer: Beta-blockers
Beta-blockers is correct because in cocaine-associated chest pain, beta-blockade can leave alpha-adrenergic vasoconstriction unopposed and worsen coronary spasm and hypertension. Benzodiazepines reduce sympathetic drive and are helpful, while aspirin and nitroglycerin are appropriate initial therapies.
- A 63-year-old man presents with 6 hours of chest pain and an ECG diagnostic of STEMI, but he reports he initially felt the pain begin 13 hours ago. He is currently pain-free and hemodynamically stable with no ongoing ischemia. What is the most appropriate management?
- Immediate full-dose fibrinolytic therapy
- Discharge home with outpatient follow-up
- Begin only aspirin and observe indefinitely
- Coronary angiography with PCI as clinically indicated rather than fibrinolytics
Correct answer: Coronary angiography with PCI as clinically indicated rather than fibrinolytics
Coronary angiography with PCI as clinically indicated rather than fibrinolytics is correct because beyond roughly 12 hours of symptom onset, fibrinolysis offers little benefit and an invasive strategy is preferred for risk stratification and revascularization. Late fibrinolytics carry bleeding risk without clear gain, and discharge or observation alone would undertreat the infarct.
- A 60-year-old woman with an acute MI develops a new loud systolic murmur and flash pulmonary edema; echo shows a flail mitral leaflet from papillary muscle rupture. Which intervention is the definitive treatment?
- Emergent surgical mitral valve repair or replacement
- Long-term oral diuretics alone
- Therapeutic anticoagulation
- Permanent pacemaker placement
Correct answer: Emergent surgical mitral valve repair or replacement
Emergent surgical mitral valve repair or replacement is correct because acute severe mitral regurgitation from papillary muscle rupture is a mechanical complication requiring urgent surgery, often with intra-aortic balloon pump stabilization. Diuretics and anticoagulation do not fix the ruptured muscle, and pacing is unrelated to the valvular failure.
- A 52-year-old man is admitted with chest pain. Serial high-sensitivity troponins are drawn. Which result pattern best supports the diagnosis of acute myocardial infarction rather than a chronic troponin elevation?
- A stable, unchanging mildly elevated troponin
- A significant rise and/or fall in troponin with one value above the 99th percentile
- An undetectable troponin throughout
- An isolated elevated BNP with normal troponin
Correct answer: A significant rise and/or fall in troponin with one value above the 99th percentile
A significant rise and/or fall in troponin with one value above the 99th percentile is correct because acute MI is defined by a dynamic troponin change in the right clinical context. A flat chronic elevation suggests structural disease rather than acute infarction, an undetectable troponin argues against MI, and BNP reflects ventricular stretch rather than acute necrosis.
- A 65-year-old man with a STEMI has a heart rate of 92 and blood pressure of 138/84 with no signs of heart failure. Which oral medication started early during the hospitalization reduces reinfarction and arrhythmia risk in stable patients?
- A potent vasodilator infusion
- A class IC antiarrhythmic
- A beta-blocker
- A short-acting dihydropyridine
Correct answer: A beta-blocker
A beta-blocker is correct because early oral beta-blockade in hemodynamically stable post-MI patients lowers myocardial oxygen demand and reduces reinfarction and ventricular arrhythmias. Vasodilator infusions are not routine, class IC antiarrhythmics increase mortality after MI, and short-acting dihydropyridines can cause reflex tachycardia.
- A 58-year-old man presents with chest pain, and his ECG shows a new left bundle branch block with concordant ST elevation. In the setting of a clinical picture consistent with ACS, how should this be treated?
- As a benign finding requiring no acute therapy
- With outpatient stress testing only
- As definitive pulmonary embolism
- As a STEMI equivalent warranting emergent reperfusion
Correct answer: As a STEMI equivalent warranting emergent reperfusion
As a STEMI equivalent warranting emergent reperfusion is correct because a new left bundle branch block with concordant ST changes (Sgarbossa criteria) in an ischemic presentation should be managed like a STEMI. Treating it as benign or deferring to outpatient testing risks missing an evolving infarct, and the picture is not that of pulmonary embolism.
- A 70-year-old man recovering from a STEMI has a measured ejection fraction of 30% at follow-up despite optimal medical therapy more than 40 days after the event. Which intervention reduces his risk of sudden cardiac death?
- Placement of an implantable cardioverter-defibrillator
- Initiation of a long-acting nitrate
- Addition of digoxin
- Routine antibiotic prophylaxis
Correct answer: Placement of an implantable cardioverter-defibrillator
Placement of an implantable cardioverter-defibrillator is correct because a persistently reduced ejection fraction at or below 35% beyond 40 days post-MI on optimal therapy meets criteria for a primary-prevention defibrillator to prevent sudden death. Nitrates and digoxin do not reduce arrhythmic death, and antibiotics have no preventive role here.
- A 48-year-old man without prior cardiac disease develops chest pain at rest, predominantly at night, with transient ST elevation that resolves spontaneously; coronary arteries are angiographically normal. Which treatment is most appropriate?
- Lifelong dual antiplatelet therapy and stenting
- Calcium channel blockers and nitrates
- A nonselective beta-blocker as monotherapy
- Emergent coronary bypass surgery
Correct answer: Calcium channel blockers and nitrates
Calcium channel blockers and nitrates is correct because vasospastic (Prinzmetal) angina with transient ST elevation and normal coronaries responds to vasodilators that relieve spasm. Stenting is unnecessary without fixed obstruction, nonselective beta-blockers can worsen spasm, and bypass surgery is not indicated for coronary vasospasm.
- A 68-year-old woman with known systolic heart failure presents with 3 days of worsening dyspnea, orthopnea, and bilateral leg edema. She is warm, well-perfused, with crackles and an elevated jugular venous pressure. Blood pressure is 142/86. What is the most appropriate initial therapy?
- Aggressive intravenous fluid bolus
- Intravenous norepinephrine
- Intravenous loop diuretic
- Immediate intubation
Correct answer: Intravenous loop diuretic
Intravenous loop diuretic is correct because this 'warm and wet' decompensation reflects volume overload with adequate perfusion, and diuresis relieves congestion. Fluid boluses would worsen the overload, vasopressors are for hypoperfusion (cold profiles), and intubation is not indicated in a patient who is oxygenating and perfusing adequately.
- A 72-year-old man with decompensated heart failure presents with severe dyspnea, blood pressure 188/104, and pulmonary edema. In addition to a loop diuretic, which therapy most rapidly reduces preload and afterload to relieve his pulmonary congestion?
- Intravenous normal saline
- Oral beta-blocker uptitration
- Intravenous calcium gluconate
- Intravenous nitroglycerin
Correct answer: Intravenous nitroglycerin
Intravenous nitroglycerin is correct because in hypertensive acute heart failure, nitrate-mediated venous and arterial dilation rapidly lowers filling pressures and relieves pulmonary edema. Saline worsens congestion, beta-blocker uptitration is avoided during acute decompensation, and calcium gluconate has no role here.
- A 60-year-old man with acute heart failure appears cool and clammy, with a narrow pulse pressure, blood pressure 84/60, and rising lactate. Which hemodynamic profile does he display, and what does it indicate?
- Cold and wet, indicating hypoperfusion with congestion
- Warm and dry, indicating compensated status
- Warm and wet, indicating isolated congestion
- Cold and dry, indicating pure hypovolemia
Correct answer: Cold and wet, indicating hypoperfusion with congestion
Cold and wet, indicating hypoperfusion with congestion is correct because cool extremities, narrow pulse pressure, hypotension, and rising lactate signal low output combined with volume overload, which may require inotropes plus careful diuresis. The other profiles do not match a hypoperfused, congested patient.
- A 75-year-old woman is admitted with acute pulmonary edema and respiratory distress but is alert and protecting her airway with oxygen saturation of 86% on a face mask. Which intervention improves oxygenation and reduces the need for intubation?
- Immediate tracheostomy
- Noninvasive positive pressure ventilation
- Chest tube placement
- High-volume intravenous fluids
Correct answer: Noninvasive positive pressure ventilation
Noninvasive positive pressure ventilation is correct because BiPAP/CPAP reduces work of breathing, improves oxygenation, and lowers intubation rates in cardiogenic pulmonary edema. Tracheostomy is not an emergency airway, chest tubes treat pneumothorax or effusion, and fluids would worsen the edema.
- A 64-year-old man with chronic heart failure with reduced ejection fraction is stabilized after an acute exacerbation. Which class of medication, when added to standard therapy, has been shown to reduce mortality in heart failure with reduced ejection fraction?
- A short-acting dihydropyridine calcium channel blocker
- A class I antiarrhythmic
- An angiotensin receptor-neprilysin inhibitor
- Chronic nonsteroidal anti-inflammatory therapy
Correct answer: An angiotensin receptor-neprilysin inhibitor
An angiotensin receptor-neprilysin inhibitor is correct because sacubitril-valsartan improves survival in heart failure with reduced ejection fraction as part of guideline-directed therapy. Short-acting calcium channel blockers and class I antiarrhythmics do not improve survival, and chronic NSAIDs promote fluid retention and worsen heart failure.
- A 58-year-old man with heart failure is found to have which set of medications that together form the foundation of guideline-directed medical therapy for reduced ejection fraction?
- Digoxin, nitrates, and a calcium channel blocker
- An antibiotic, a statin, and aspirin
- A loop diuretic alone
- A renin-angiotensin system inhibitor, beta-blocker, mineralocorticoid antagonist, and SGLT2 inhibitor
Correct answer: A renin-angiotensin system inhibitor, beta-blocker, mineralocorticoid antagonist, and SGLT2 inhibitor
A renin-angiotensin system inhibitor, beta-blocker, mineralocorticoid antagonist, and SGLT2 inhibitor is correct because these four pillars together reduce mortality and hospitalization in heart failure with reduced ejection fraction. The other combinations relieve symptoms or treat unrelated conditions but are not the survival-improving foundation.
- A 70-year-old man with severe acute heart failure remains hypotensive with poor perfusion despite diuresis. An inotrope is needed. Which agent increases contractility and is appropriate for cardiogenic shock with low output?
- Dobutamine
- A pure alpha-agonist with no inotropy
- A loop diuretic infusion alone
- Oral metoprolol
Correct answer: Dobutamine
Dobutamine is correct because it is a beta-1 agonist inotrope that augments contractility and cardiac output in low-output heart failure. A pure vasoconstrictor without inotropy does not improve contractility, more diuresis would not address pump failure, and beta-blockade further depresses an already failing heart.
- A 62-year-old woman with heart failure with preserved ejection fraction is admitted with volume overload. Which statement best reflects the management focus for this condition?
- High-dose inotropes to raise ejection fraction
- Diuresis for congestion and aggressive control of blood pressure and comorbidities
- Routine anticoagulation regardless of rhythm
- Avoidance of all diuretics
Correct answer: Diuresis for congestion and aggressive control of blood pressure and comorbidities
Diuresis for congestion and aggressive control of blood pressure and comorbidities is correct because heart failure with preserved ejection fraction is managed by relieving congestion and treating drivers such as hypertension, with SGLT2 inhibitors now beneficial. Inotropes do not help a normal ejection fraction, routine anticoagulation is not indicated, and diuretics are needed for congestion.
- A 55-year-old man with new heart failure is being evaluated for the cause. Which initial test is most useful to assess ejection fraction and structural abnormalities?
- Cardiac stress test only
- 24-hour ambulatory blood pressure monitoring
- Transthoracic echocardiography
- Plain chest radiograph alone
Correct answer: Transthoracic echocardiography
Transthoracic echocardiography is correct because it noninvasively quantifies ejection fraction, chamber size, valvular function, and wall motion, guiding heart failure classification and therapy. A chest radiograph shows congestion but not ejection fraction, stress testing assesses ischemia, and ambulatory blood pressure does not characterize cardiac structure.
- A 69-year-old man hospitalized with acute heart failure has a brain natriuretic peptide (BNP) that is markedly elevated. How should this result be interpreted in the context of his dyspnea?
- It confirms primary pulmonary embolism
- It excludes any cardiac contribution
- It indicates renal failure as the sole cause
- It supports a cardiac cause of dyspnea from elevated ventricular wall stress
Correct answer: It supports a cardiac cause of dyspnea from elevated ventricular wall stress
It supports a cardiac cause of dyspnea from elevated ventricular wall stress is correct because BNP rises with myocardial stretch and helps distinguish cardiac from noncardiac dyspnea. It does not confirm pulmonary embolism, a high value supports rather than excludes cardiac involvement, and although renal dysfunction can raise BNP, the marked elevation here points to heart failure.
- A 71-year-old woman with acute decompensated heart failure has a serum sodium of 124 mEq/L and persistent congestion. Which combined approach to her hyponatremia and volume overload is most appropriate?
- Diuresis with fluid restriction
- Rapid infusion of free water
- Liberal oral and intravenous fluids
- Immediate hypertonic saline for asymptomatic mild hyponatremia
Correct answer: Diuresis with fluid restriction
Diuresis with fluid restriction is correct because hyponatremia in heart failure is typically dilutional from volume overload and neurohormonal water retention, so removing excess fluid and restricting intake corrects both problems. Free water and liberal fluids worsen the picture, and hypertonic saline is reserved for severe symptomatic hyponatremia.
- A 60-year-old man with heart failure is taking a loop diuretic, an ACE inhibitor, and spironolactone. He presents with weakness and a potassium of 6.4 mEq/L with peaked T waves on ECG. What is the most appropriate immediate intervention?
- Adding a potassium supplement
- Intravenous calcium gluconate to stabilize the cardiac membrane
- Increasing the spironolactone dose
- Administering an oral beta-blocker
Correct answer: Intravenous calcium gluconate to stabilize the cardiac membrane
Intravenous calcium gluconate to stabilize the cardiac membrane is correct because hyperkalemia with ECG changes requires immediate cardiac membrane stabilization with calcium, followed by therapies to shift and remove potassium and discontinuation of offending agents. Potassium supplements and higher spironolactone worsen hyperkalemia, and a beta-blocker does not address the emergency.
- A 50-year-old man presents with new-onset heart failure 2 weeks after a viral upper respiratory illness, with global ventricular dysfunction and no coronary disease. What is the most likely underlying cause?
- Hypertrophic obstructive cardiomyopathy
- Constrictive pericarditis
- Viral myocarditis leading to dilated cardiomyopathy
- Acute aortic stenosis
Correct answer: Viral myocarditis leading to dilated cardiomyopathy
Viral myocarditis leading to dilated cardiomyopathy is correct because a recent viral illness followed by global systolic dysfunction without coronary disease classically reflects post-viral myocarditis. Hypertrophic cardiomyopathy causes diastolic dysfunction with hypertrophy, constrictive pericarditis impairs filling, and aortic stenosis does not develop acutely after a viral illness.
- A 66-year-old man recovering from acute heart failure has reached euvolemia. When is the optimal time to start or uptitrate his beta-blocker?
- During the peak of acute pulmonary edema
- Only after discharge by the outpatient provider weeks later
- Never, because beta-blockers are contraindicated in heart failure
- Once he is hemodynamically stable and no longer volume overloaded
Correct answer: Once he is hemodynamically stable and no longer volume overloaded
Once he is hemodynamically stable and no longer volume overloaded is correct because beta-blockers are started or uptitrated after compensation to avoid worsening acute decompensation, yet they are essential long-term therapy. Starting during florid edema can be harmful, indefinite delay forgoes survival benefit, and beta-blockers are indicated, not contraindicated, in stable systolic heart failure.
- A 78-year-old woman with end-stage heart failure has refractory congestion despite high-dose intravenous loop diuretics. Which strategy is a reasonable next step to overcome diuretic resistance?
- Add a thiazide-type diuretic for sequential nephron blockade
- Stop all diuretics and restrict no fluids
- Begin large-volume intravenous fluids
- Switch to oral diuretics at a lower dose
Correct answer: Add a thiazide-type diuretic for sequential nephron blockade
Add a thiazide-type diuretic for sequential nephron blockade is correct because adding a thiazide such as metolazone to a loop diuretic blocks distal sodium reabsorption and enhances diuresis in resistant patients. Stopping diuretics or giving fluids worsens congestion, and switching to lower-dose oral therapy reduces efficacy.
- A 59-year-old man with heart failure asks about lifestyle measures. Which recommendation is most appropriate for reducing recurrent decompensation?
- Unrestricted high-sodium diet
- Daily weight monitoring and dietary sodium restriction
- Avoidance of all physical activity
- Stopping all medications when feeling well
Correct answer: Daily weight monitoring and dietary sodium restriction
Daily weight monitoring and dietary sodium restriction is correct because tracking weight detects early fluid gain and limiting sodium reduces congestion and hospitalizations. A high-sodium diet promotes retention, complete inactivity is harmful and supervised exercise is beneficial, and stopping medications precipitates decompensation.
- A 67-year-old man with acute heart failure and cardiogenic shock not responding to inotropes is being considered for mechanical support. Which device provides temporary circulatory support as a bridge to recovery or further therapy?
- A permanent transvenous pacemaker
- An implantable loop recorder
- An intra-aortic balloon pump or percutaneous ventricular assist device
- A peripherally inserted central catheter
Correct answer: An intra-aortic balloon pump or percutaneous ventricular assist device
An intra-aortic balloon pump or percutaneous ventricular assist device is correct because temporary mechanical circulatory support augments cardiac output in refractory cardiogenic shock as a bridge to recovery, decision, or transplant. A pacemaker addresses rhythm, a loop recorder only monitors, and a central catheter provides venous access, not circulatory support.
- A 73-year-old man with heart failure with reduced ejection fraction in sinus rhythm remains symptomatic with a resting heart rate of 78 despite a maximally tolerated beta-blocker. Which additional medication can reduce heart failure hospitalizations by slowing the heart rate?
- A short-acting nitrate
- An oral antibiotic
- A nonsteroidal anti-inflammatory drug
- Ivabradine
Correct answer: Ivabradine
Ivabradine is correct because it slows the sinus node in patients still tachycardic in sinus rhythm on maximal beta-blockade, reducing heart failure hospitalizations. Nitrates do not control rate, antibiotics treat infection, and NSAIDs worsen fluid retention in heart failure.
- A 65-year-old woman with acute heart failure has worsening renal function and rising creatinine during aggressive diuresis, a pattern termed cardiorenal syndrome. Which approach best balances decongestion and renal perfusion?
- Continue effective decongestion while monitoring renal function, adjusting as needed
- Stop diuresis entirely and accept congestion
- Give large fluid boluses to protect the kidneys
- Start dialysis immediately for any creatinine rise
Correct answer: Continue effective decongestion while monitoring renal function, adjusting as needed
Continue effective decongestion while monitoring renal function, adjusting as needed is correct because adequate decongestion often improves cardiorenal physiology, and a modest creatinine rise during effective diuresis is frequently acceptable. Abandoning diuresis perpetuates congestion, fluid boluses worsen overload, and dialysis is reserved for refractory or severe cases.
- A 61-year-old man with ischemic cardiomyopathy and an ejection fraction of 28% has a wide QRS with left bundle branch block morphology and remains symptomatic on optimal therapy. Which device therapy can improve symptoms and survival?
- Carotid sinus stimulation
- Cardiac resynchronization therapy
- A single-chamber atrial pacemaker
- Routine ablation of the AV node
Correct answer: Cardiac resynchronization therapy
Cardiac resynchronization therapy is correct because biventricular pacing resynchronizes contraction in patients with reduced ejection fraction and a wide left bundle branch block, improving symptoms and survival. Carotid stimulation, an atrial-only pacemaker, and AV node ablation do not correct interventricular dyssynchrony.
- A 56-year-old man is discharged after an acute heart failure hospitalization. Which intervention most reduces his 30-day readmission risk?
- Discontinuing his guideline-directed medications at discharge
- Avoiding any outpatient follow-up
- Early follow-up with medication reconciliation and education
- Restricting fluids to less than 500 mL per day routinely
Correct answer: Early follow-up with medication reconciliation and education
Early follow-up with medication reconciliation and education is correct because timely post-discharge visits, optimized medications, and self-care teaching reduce readmissions. Stopping guideline therapy and skipping follow-up increase decompensation risk, and extreme fluid restriction is not routinely indicated and can cause harm.
- A 68-year-old man presents with palpitations and an irregularly irregular pulse. ECG confirms atrial fibrillation with a ventricular rate of 140. His blood pressure is 128/78 and he is asymptomatic apart from the palpitations. What is the most appropriate initial management?
- Immediate synchronized cardioversion
- Intravenous fibrinolytic therapy
- Emergent permanent pacemaker placement
- Rate control with a beta-blocker or non-dihydropyridine calcium channel blocker
Correct answer: Rate control with a beta-blocker or non-dihydropyridine calcium channel blocker
Rate control with a beta-blocker or non-dihydropyridine calcium channel blocker is correct because a hemodynamically stable patient with rapid atrial fibrillation is first managed by slowing the ventricular rate. Immediate cardioversion is reserved for instability, fibrinolytics treat thrombotic occlusion, and pacing is not indicated for a rapid rate.
- A 60-year-old woman with new atrial fibrillation has a CHA2DS2-VASc score of 3. She has no contraindications to anticoagulation. Which therapy is most appropriate to reduce her stroke risk?
- A direct oral anticoagulant
- Aspirin monotherapy
- No antithrombotic therapy
- A short course of a nonsteroidal anti-inflammatory drug
Correct answer: A direct oral anticoagulant
A direct oral anticoagulant is correct because a CHA2DS2-VASc score of 3 indicates sufficient stroke risk to warrant oral anticoagulation, and direct oral anticoagulants are preferred over warfarin in nonvalvular atrial fibrillation. Aspirin is inadequate for stroke prevention in this setting, no therapy leaves her at risk, and NSAIDs do not prevent stroke.
- A 74-year-old man presents with atrial fibrillation, a heart rate of 160, blood pressure of 78/44, chest pain, and altered mental status. What is the most appropriate immediate treatment?
- Oral rate-control medication and observation
- Immediate synchronized cardioversion
- Outpatient cardiology referral
- Carotid sinus massage
Correct answer: Immediate synchronized cardioversion
Immediate synchronized cardioversion is correct because atrial fibrillation with hemodynamic instability (hypotension, ischemia, altered mentation) requires prompt electrical cardioversion regardless of duration. Oral medications work too slowly for an unstable patient, outpatient referral delays needed treatment, and carotid massage will not restore stability.
- A 55-year-old man is found to have atrial fibrillation of uncertain duration and is hemodynamically stable. He is not on anticoagulation. Before attempting elective cardioversion, which approach reduces the risk of thromboembolism?
- Cardiovert immediately without any anticoagulation
- Give a single dose of aspirin and cardiovert
- Anticoagulate for at least 3 weeks before and 4 weeks after, or perform transesophageal echocardiography to exclude thrombus
- Delay all therapy for several months
Correct answer: Anticoagulate for at least 3 weeks before and 4 weeks after, or perform transesophageal echocardiography to exclude thrombus
Anticoagulate for at least 3 weeks before and 4 weeks after, or perform transesophageal echocardiography to exclude thrombus is correct because atrial fibrillation lasting 48 hours or more risks atrial thrombus that can embolize with cardioversion, so anticoagulation or TEE exclusion is required. Immediate cardioversion without these steps, aspirin alone, or indefinite delay are not appropriate.
- A 62-year-old woman with paroxysmal atrial fibrillation has a CHA2DS2-VASc score of 0. She has no other risk factors. What is the recommended antithrombotic strategy?
- Lifelong warfarin
- A direct oral anticoagulant indefinitely
- Dual antiplatelet therapy
- No antithrombotic therapy
Correct answer: No antithrombotic therapy
No antithrombotic therapy is correct because a CHA2DS2-VASc score of 0 in a man (or low score with appropriate consideration) reflects low stroke risk that does not justify the bleeding risk of anticoagulation. Warfarin, direct oral anticoagulants, and dual antiplatelet therapy all add bleeding risk without sufficient benefit at this low score.
- A 58-year-old man with atrial fibrillation has decompensated heart failure with a reduced ejection fraction and needs rate control. Which agent is preferred and which should generally be avoided?
- Prefer a beta-blocker or digoxin; avoid non-dihydropyridine calcium channel blockers
- Prefer verapamil; avoid all beta-blockers
- Prefer diltiazem; avoid digoxin entirely
- Prefer a short-acting dihydropyridine; avoid beta-blockers
Correct answer: Prefer a beta-blocker or digoxin; avoid non-dihydropyridine calcium channel blockers
Prefer a beta-blocker or digoxin; avoid non-dihydropyridine calcium channel blockers is correct because verapamil and diltiazem have negative inotropic effects that can worsen reduced-ejection-fraction heart failure, so beta-blockers or digoxin are safer for rate control. The other choices recommend the agents that should be avoided in this setting.
- A 70-year-old man has persistent symptomatic atrial fibrillation despite adequate rate control, significantly impairing his quality of life. Which strategy is reasonable to restore and maintain sinus rhythm?
- Permanent discontinuation of anticoagulation
- Antiarrhythmic drug therapy or catheter ablation
- Indefinite high-dose diuretics
- Routine implantable defibrillator placement
Correct answer: Antiarrhythmic drug therapy or catheter ablation
Antiarrhythmic drug therapy or catheter ablation is correct because a rhythm-control strategy with antiarrhythmics or pulmonary vein isolation is appropriate when symptoms persist despite rate control. Stopping anticoagulation increases stroke risk, diuretics do not control rhythm, and a defibrillator does not treat atrial fibrillation.
- A 65-year-old man taking warfarin for atrial fibrillation asks why a direct oral anticoagulant might be preferred for nonvalvular atrial fibrillation. Which is an accurate advantage of direct oral anticoagulants?
- They are safe to use in mechanical heart valves
- They require frequent dietary vitamin K restriction
- They do not require routine INR monitoring and have fewer food and drug interactions
- They have no risk of bleeding
Correct answer: They do not require routine INR monitoring and have fewer food and drug interactions
They do not require routine INR monitoring and have fewer food and drug interactions is correct because direct oral anticoagulants offer predictable dosing without INR checks in nonvalvular atrial fibrillation. They are contraindicated in mechanical valves, do not require vitamin K restriction, and still carry bleeding risk.
- A 50-year-old man presents with new atrial fibrillation, weight loss, tremor, and a suppressed TSH with elevated free T4. What underlying condition should be addressed as part of his management?
- Primary hypothyroidism
- Iron deficiency anemia
- Chronic kidney disease
- Hyperthyroidism precipitating the atrial fibrillation
Correct answer: Hyperthyroidism precipitating the atrial fibrillation
Hyperthyroidism precipitating the atrial fibrillation is correct because thyrotoxicosis is a reversible cause of atrial fibrillation, and treating the hyperthyroidism is essential for rhythm control. Hypothyroidism, anemia, and kidney disease are not indicated by the suppressed TSH and elevated free T4.
- A 67-year-old woman with atrial fibrillation has a CHA2DS2-VASc score of 4 but also a history of recurrent severe gastrointestinal bleeding that precludes long-term anticoagulation. Which intervention can reduce her stroke risk?
- Left atrial appendage occlusion
- Permanent pacemaker implantation
- Coronary stenting
- Lifelong aspirin and clopidogrel as definitive therapy
Correct answer: Left atrial appendage occlusion
Left atrial appendage occlusion is correct because percutaneous closure of the left atrial appendage offers stroke reduction for patients with atrial fibrillation who cannot tolerate long-term anticoagulation. Pacemakers and coronary stents do not prevent atrial thromboembolism, and dual antiplatelet therapy is not equivalent definitive stroke prevention in this scenario.
- A 59-year-old man presents with palpitations; his ECG shows an irregularly irregular rhythm with no discernible P waves. Which finding best confirms the diagnosis of atrial fibrillation?
- Regular sawtooth flutter waves
- Irregularly irregular ventricular response with absent organized atrial activity
- A delta wave with short PR interval
- Regular narrow-complex tachycardia with retrograde P waves
Correct answer: Irregularly irregular ventricular response with absent organized atrial activity
Irregularly irregular ventricular response with absent organized atrial activity is correct because atrial fibrillation is defined electrocardiographically by chaotic atrial activity without P waves and an irregularly irregular ventricular rate. Sawtooth waves indicate atrial flutter, a delta wave suggests pre-excitation, and a regular narrow-complex tachycardia describes a different supraventricular arrhythmia.
- A 72-year-old man with atrial fibrillation is started on a beta-blocker for rate control. What resting heart rate target is generally appropriate for a lenient rate-control strategy in an asymptomatic patient?
- A resting heart rate below 50 beats per minute
- A resting heart rate of exactly 60 beats per minute required
- A resting heart rate below 110 beats per minute
- No target is needed because rate does not matter
Correct answer: A resting heart rate below 110 beats per minute
A resting heart rate below 110 beats per minute is correct because lenient rate control to under 110 is acceptable in asymptomatic patients with preserved ventricular function and is as effective as strict control. A target below 50 risks bradycardia, an exact value of 60 is not required, and ignoring rate entirely is inappropriate.
- A 63-year-old woman is diagnosed with atrial flutter with 2:1 conduction and a regular rate of 150. Which feature distinguishes typical atrial flutter from atrial fibrillation on the ECG?
- Completely absent atrial activity
- An irregularly irregular ventricular response
- A wide QRS with delta waves
- A regular sawtooth pattern of flutter waves, often in the inferior leads
Correct answer: A regular sawtooth pattern of flutter waves, often in the inferior leads
A regular sawtooth pattern of flutter waves, often in the inferior leads is correct because atrial flutter produces organized, regular sawtooth atrial waves, unlike the disorganized atrial activity and irregular ventricular response of atrial fibrillation. Absent atrial activity and irregular rhythm describe fibrillation, and delta waves indicate pre-excitation.
- A 56-year-old man develops acute atrial fibrillation following coronary artery bypass surgery. He is hemodynamically stable. Beyond rate control, what is an important consideration in this postoperative setting?
- Postoperative atrial fibrillation is often transient and may resolve, but anticoagulation risk and benefit must still be weighed
- It always indicates a new structural heart defect requiring valve surgery
- Anticoagulation is never appropriate after cardiac surgery
- It mandates immediate pacemaker placement
Correct answer: Postoperative atrial fibrillation is often transient and may resolve, but anticoagulation risk and benefit must still be weighed
Postoperative atrial fibrillation is often transient and may resolve, but anticoagulation risk and benefit must still be weighed is correct because post-cardiac-surgery atrial fibrillation is common and frequently self-limited, yet stroke and bleeding risks must be individualized. It does not invariably signal a new valve defect, anticoagulation is sometimes appropriate, and pacing is not routinely required.
- A 48-year-old man with no structural heart disease has recurrent paroxysmal atrial fibrillation triggered by binge alcohol use on weekends. What is the most appropriate first-line counseling?
- Recommend lifelong amiodarone immediately
- Advise reduction or cessation of alcohol to decrease atrial fibrillation episodes
- Begin warfarin regardless of stroke risk score
- Schedule immediate catheter ablation as first-line therapy
Correct answer: Advise reduction or cessation of alcohol to decrease atrial fibrillation episodes
Advise reduction or cessation of alcohol to decrease atrial fibrillation episodes is correct because alcohol is a well-recognized, modifiable trigger ('holiday heart'), and reducing intake decreases recurrences. Amiodarone has significant toxicity and is not first-line here, anticoagulation depends on the stroke risk score, and ablation is reserved for refractory symptomatic cases.
- A 71-year-old man with atrial fibrillation has the components of his CHA2DS2-VASc score reviewed. Which factor contributes 2 points rather than 1?
- Hypertension
- Diabetes mellitus
- Prior stroke or transient ischemic attack
- Vascular disease
Correct answer: Prior stroke or transient ischemic attack
Prior stroke or transient ischemic attack is correct because prior thromboembolism (and age 75 or older) each contribute 2 points in the CHA2DS2-VASc score, reflecting their strong association with recurrent stroke. Hypertension, diabetes, and vascular disease each add only 1 point.
- A 64-year-old woman taking a direct oral anticoagulant for atrial fibrillation needs an elective colonoscopy. Regarding her anticoagulation around the procedure, which approach is generally appropriate?
- Continue full-dose anticoagulation through the procedure regardless of bleeding risk
- Permanently discontinue anticoagulation after the procedure
- Bridge every patient with therapeutic heparin
- Temporarily hold the anticoagulant for an appropriate interval based on renal function and bleeding risk, then resume
Correct answer: Temporarily hold the anticoagulant for an appropriate interval based on renal function and bleeding risk, then resume
Temporarily hold the anticoagulant for an appropriate interval based on renal function and bleeding risk, then resume is correct because direct oral anticoagulants are briefly interrupted around procedures with bleeding risk and restarted afterward, with timing guided by renal clearance. Continuing full dose increases bleeding, permanent discontinuation removes stroke protection, and routine heparin bridging is usually unnecessary with these agents.
- A 60-year-old man with atrial fibrillation and rapid ventricular response is given intravenous diltiazem, but his rate remains elevated and he develops mild hypotension. Which alternative rate-controlling agent works partly by enhancing vagal tone and is useful when blood pressure is borderline?
- Digoxin
- Intravenous nitroprusside
- Intravenous epinephrine
- Oral hydralazine
Correct answer: Digoxin
Digoxin is correct because it slows AV nodal conduction largely through vagal enhancement and does not lower blood pressure, making it useful in atrial fibrillation with hypotension or heart failure. Nitroprusside and hydralazine lower blood pressure, and epinephrine would increase the heart rate.
- A 55-year-old man presents with a wide-complex irregular tachycardia at rates exceeding 250, and his baseline ECG shows a short PR interval with a delta wave. He has atrial fibrillation in the setting of Wolff-Parkinson-White. Which agent should be avoided?
- Procainamide
- AV nodal blocking agents such as diltiazem or digoxin
- Synchronized cardioversion if unstable
- An antiarrhythmic that acts on the accessory pathway
Correct answer: AV nodal blocking agents such as diltiazem or digoxin
AV nodal blocking agents such as diltiazem or digoxin is correct because in pre-excited atrial fibrillation, blocking the AV node can accelerate conduction down the accessory pathway and precipitate ventricular fibrillation. Procainamide and accessory-pathway antiarrhythmics are appropriate, and cardioversion is correct if the patient is unstable.
- A 69-year-old man with persistent atrial fibrillation is being counseled that landmark trials comparing rate control and rhythm control found which general result for many patients?
- Rhythm control always reduces mortality compared with rate control
- Rate control is contraindicated in all patients
- Rate control and rhythm control yield similar outcomes for many patients, so symptoms and individual factors guide the choice
- Anticoagulation can be stopped once sinus rhythm is restored
Correct answer: Rate control and rhythm control yield similar outcomes for many patients, so symptoms and individual factors guide the choice
Rate control and rhythm control yield similar outcomes for many patients, so symptoms and individual factors guide the choice is correct because trials showed broadly comparable outcomes, making symptom burden and patient characteristics decisive. Rhythm control is not universally superior, rate control is widely used, and anticoagulation decisions depend on stroke risk, not on transiently restored sinus rhythm.
- A 24-year-old woman with type 1 diabetes presents with vomiting, abdominal pain, and Kussmaul breathing. Labs show glucose 480 mg/dL, anion gap 24, bicarbonate 10 mEq/L, and large serum ketones. What is the most appropriate first step in management?
- An immediate intravenous insulin bolus before any fluids
- Intravenous sodium bicarbonate
- Subcutaneous long-acting insulin alone
- Intravenous isotonic fluid resuscitation
Correct answer: Intravenous isotonic fluid resuscitation
Intravenous isotonic fluid resuscitation is correct because patients in diabetic ketoacidosis are profoundly volume depleted, and fluids are the first priority to restore perfusion before or alongside insulin. Insulin without fluids risks vascular collapse, bicarbonate is reserved for severe acidemia, and long-acting subcutaneous insulin alone does not acutely close the gap.
- A 19-year-old man with diabetic ketoacidosis is being started on an insulin infusion. His initial potassium is 3.2 mEq/L. What is the most appropriate action regarding insulin and potassium?
- Hold insulin and replace potassium first, then start insulin once potassium is adequate
- Start insulin immediately and ignore the potassium
- Give potassium only after the acidosis resolves
- Administer a potassium-binding resin
Correct answer: Hold insulin and replace potassium first, then start insulin once potassium is adequate
Hold insulin and replace potassium first, then start insulin once potassium is adequate is correct because insulin drives potassium intracellularly and can cause fatal hypokalemia when the level is already low, so potassium is repleted to a safe level before insulin is given. Starting insulin immediately or delaying potassium worsens hypokalemia, and a binding resin is the opposite of what is needed.
- A 27-year-old woman being treated for diabetic ketoacidosis has her glucose fall to 200 mg/dL on the insulin infusion, but her anion gap remains elevated and ketones persist. What is the most appropriate next step?
- Stop the insulin infusion immediately
- Add dextrose to the intravenous fluids while continuing the insulin infusion
- Discontinue all intravenous fluids
- Switch to subcutaneous sliding-scale insulin only
Correct answer: Add dextrose to the intravenous fluids while continuing the insulin infusion
Add dextrose to the intravenous fluids while continuing the insulin infusion is correct because insulin must continue to clear ketones and close the anion gap; adding dextrose prevents hypoglycemia while the infusion runs. Stopping insulin halts ketone clearance, removing fluids worsens depletion, and switching to sliding scale prematurely interrupts the gap-closing therapy.
- A patient with diabetic ketoacidosis is ready to transition off the insulin infusion. Which criteria best indicate it is appropriate to switch to subcutaneous insulin?
- Normal glucose alone, regardless of the gap
- Resolution of thirst
- Resolution of the anion gap, bicarbonate at least 15-18, and the patient able to eat
- A single normal potassium value
Correct answer: Resolution of the anion gap, bicarbonate at least 15-18, and the patient able to eat
Resolution of the anion gap, bicarbonate at least 15-18, and the patient able to eat is correct because ketoacidosis resolution is defined by closure of the gap and corrected acidosis, not glucose alone, with overlap of subcutaneous insulin before stopping the drip. Normal glucose, relief of thirst, or a single potassium value do not confirm resolution.
- A 22-year-old man presents in diabetic ketoacidosis. Which precipitating factor should be actively investigated as a common trigger?
- Excessive water intake
- A high-fiber diet
- Recent vaccination
- Infection or insulin nonadherence
Correct answer: Infection or insulin nonadherence
Infection or insulin nonadherence is correct because infection and missed insulin doses are the most common precipitants of diabetic ketoacidosis and should be sought and treated. Water intake, a high-fiber diet, and vaccination are not recognized common triggers of ketoacidosis.
- A 30-year-old woman with diabetic ketoacidosis has a measured serum sodium of 132 mEq/L with a glucose of 600 mg/dL. How should her sodium be interpreted?
- The sodium should be corrected upward for hyperglycemia, revealing true hypertonic dehydration
- The sodium is truly low and requires hypertonic saline
- The value indicates water intoxication
- The sodium is irrelevant in ketoacidosis
Correct answer: The sodium should be corrected upward for hyperglycemia, revealing true hypertonic dehydration
The sodium should be corrected upward for hyperglycemia, revealing true hypertonic dehydration is correct because hyperglycemia osmotically draws water into the vasculature, falsely lowering measured sodium, so correction reveals the underlying hypertonic state. The measured value is not a true hyponatremia needing hypertonic saline, does not indicate water intoxication, and is clinically relevant.
- A 25-year-old man with diabetic ketoacidosis has an arterial pH of 7.05. His team considers bicarbonate. According to current guidance, when is bicarbonate generally considered in diabetic ketoacidosis?
- Routinely for any pH below 7.3
- Only for severe acidemia, generally a pH below 6.9
- Whenever ketones are present
- As the first-line therapy before fluids
Correct answer: Only for severe acidemia, generally a pH below 6.9
Only for severe acidemia, generally a pH below 6.9 is correct because bicarbonate has not shown benefit and may cause harm in moderate ketoacidosis, so it is reserved for very severe acidemia. Routine use at higher pH, use for any ketones, or using it before fluids are not appropriate.
- A 28-year-old woman with type 1 diabetes presents with nausea and ketosis but a glucose of only 165 mg/dL; she is pregnant and was on an SGLT2 inhibitor. The anion gap is elevated with ketonemia. What diagnosis should be recognized?
- Hyperosmolar hyperglycemic state
- Lactic acidosis from sepsis
- Euglycemic diabetic ketoacidosis
- Simple starvation ketosis without acidosis
Correct answer: Euglycemic diabetic ketoacidosis
Euglycemic diabetic ketoacidosis is correct because pregnancy and SGLT2 inhibitors can produce ketoacidosis with near-normal glucose, so a relatively low glucose does not exclude the diagnosis when the gap and ketones are elevated. Hyperosmolar state involves very high glucose, sepsis causes lactic acidosis, and simple starvation does not produce a high anion gap acidosis of this magnitude.
- A patient with diabetic ketoacidosis is started on an insulin infusion and aggressive fluids. Which laboratory parameter is most useful to monitor the resolution of ketoacidosis and titrate therapy?
- Serum amylase
- The white blood cell count alone
- Serum magnesium alone
- The anion gap (and beta-hydroxybutyrate if available)
Correct answer: The anion gap (and beta-hydroxybutyrate if available)
The anion gap (and beta-hydroxybutyrate if available) is correct because closure of the anion gap and falling beta-hydroxybutyrate reflect resolving ketosis and guide when to transition therapy. Amylase, white count, and magnesium do not track ketoacidosis resolution.
- A 21-year-old man with diabetic ketoacidosis develops worsening headache and decreasing consciousness several hours into treatment, after rapid correction of glucose and large fluid volumes. What complication should be suspected?
- Cerebral edema
- Hyperosmolar coma
- Acute pancreatitis
- Pulmonary embolism
Correct answer: Cerebral edema
Cerebral edema is correct because deteriorating mental status during ketoacidosis treatment, especially after rapid osmolar shifts, suggests cerebral edema, a feared complication more common in younger patients. Hyperosmolar coma involves rising rather than falling osmolality, and pancreatitis and embolism do not classically present this way during ketoacidosis correction.
- A 26-year-old woman recovering from diabetic ketoacidosis is being educated on prevention. Which sick-day instruction is most appropriate?
- Stop all insulin when unable to eat
- Continue insulin even when not eating well and monitor glucose and ketones frequently during illness
- Discontinue fluids during illness
- Double the insulin dose only when feeling well
Correct answer: Continue insulin even when not eating well and monitor glucose and ketones frequently during illness
Continue insulin even when not eating well and monitor glucose and ketones frequently during illness is correct because stress of illness raises insulin requirements, and stopping basal insulin during sickness is a leading cause of ketoacidosis. Stopping insulin or fluids and dosing only when well are exactly the behaviors that precipitate ketoacidosis.
- A 33-year-old man with diabetic ketoacidosis is volume resuscitated; once he is hemodynamically stable and his glucose and sodium are reassessed, which fluid is typically chosen if the corrected sodium is normal or high?
- Continued bolus normal saline indefinitely
- 5% dextrose with no electrolytes
- Half-normal saline (0.45% sodium chloride)
- Hypertonic 3% saline
Correct answer: Half-normal saline (0.45% sodium chloride)
Half-normal saline (0.45% sodium chloride) is correct because after initial resuscitation, hypotonic fluid replaces the free water deficit when the corrected sodium is normal or elevated. Endless isotonic boluses can cause hyperchloremia, dextrose alone neglects sodium needs, and hypertonic saline would worsen the hypertonic dehydration.
- A 23-year-old woman is admitted with diabetic ketoacidosis precipitated by a urinary tract infection. Beyond fluids, insulin, and electrolytes, what additional management is essential?
- Withhold antibiotics until ketoacidosis fully resolves
- Avoid any cultures to limit testing
- Begin chronic immunosuppression
- Treat the underlying precipitating infection
Correct answer: Treat the underlying precipitating infection
Treat the underlying precipitating infection is correct because identifying and treating the trigger, such as infection, is integral to resolving ketoacidosis and preventing recurrence. Delaying antibiotics, avoiding cultures, and immunosuppression are inappropriate and would worsen the precipitant.
- A patient in diabetic ketoacidosis has potassium of 5.8 mEq/L initially. As insulin and fluids are given, what is expected to happen to the serum potassium and why?
- It will fall as insulin shifts potassium intracellularly and acidosis resolves
- It will rise further despite insulin
- It will remain unchanged regardless of treatment
- It will become irrelevant once glucose normalizes
Correct answer: It will fall as insulin shifts potassium intracellularly and acidosis resolves
It will fall as insulin shifts potassium intracellularly and acidosis resolves is correct because total body potassium is depleted in ketoacidosis even when the initial level is high, and insulin plus correction of acidosis drives potassium into cells, mandating monitoring and repletion. The level does not rise with insulin, is not static, and remains clinically critical.
- A 29-year-old man with diabetic ketoacidosis is treated and improves. Which finding distinguishes diabetic ketoacidosis from hyperosmolar hyperglycemic state?
- Higher glucose levels and more profound dehydration in ketoacidosis
- Marked ketonemia and high anion gap acidosis in ketoacidosis
- Absence of any insulin in hyperosmolar state
- Lack of mental status changes in hyperosmolar state
Correct answer: Marked ketonemia and high anion gap acidosis in ketoacidosis
Marked ketonemia and high anion gap acidosis in ketoacidosis is correct because ketoacidosis is characterized by significant ketosis and acidemia, whereas hyperosmolar state has minimal ketosis but extreme hyperglycemia and dehydration. The other statements reverse or misattribute the defining features of these two conditions.
- A 31-year-old woman with diabetic ketoacidosis on an insulin drip has frequent glucose checks. What is the typical recommended frequency of glucose monitoring during active insulin infusion treatment?
- Once every 12 hours
- Only once at admission
- Hourly
- Every 30 seconds continuously by lab draw
Correct answer: Hourly
Hourly is correct because frequent (typically hourly) glucose monitoring during an insulin infusion allows titration to avoid hypoglycemia and ensure steady gap closure. Checking every 12 hours or only once is too infrequent for an active drip, and laboratory draws every 30 seconds are impractical and unnecessary.
- A 26-year-old man presents with his first episode of diabetic ketoacidosis and is newly diagnosed with diabetes. Which type of diabetes is most consistent with ketoacidosis as the presenting event in a young, lean patient?
- Well-controlled type 2 diabetes
- Gestational physiology
- Maturity-onset diabetes of the young with mild hyperglycemia
- Type 1 diabetes mellitus
Correct answer: Type 1 diabetes mellitus
Type 1 diabetes mellitus is correct because absolute insulin deficiency in type 1 diabetes commonly presents with ketoacidosis, especially in young, lean patients. Well-controlled type 2 diabetes rarely presents this way, and the other entities do not typically debut with ketoacidosis.
- A patient being treated for diabetic ketoacidosis has the insulin infusion rate reduced when glucose approaches 200 mg/dL, yet the team ensures the rate stays high enough to suppress ketogenesis. What is the rationale for not stopping insulin at this point?
- Insulin is still required to suppress ketone production until the anion gap closes
- Glucose alone determines resolution
- Insulin has no effect on ketone production
- Stopping insulin speeds recovery
Correct answer: Insulin is still required to suppress ketone production until the anion gap closes
Insulin is still required to suppress ketone production until the anion gap closes is correct because insulin halts lipolysis and ketogenesis, and prematurely stopping it allows ketosis to recur even with normalized glucose. Glucose alone does not define resolution, insulin clearly affects ketogenesis, and stopping it would prolong the illness.
- A 24-year-old woman with diabetic ketoacidosis has phosphate measured and found to be low. When is phosphate replacement generally considered in ketoacidosis?
- Routinely in every patient regardless of level
- For severe hypophosphatemia or associated cardiac, respiratory, or muscle dysfunction
- Never under any circumstances
- Only after the patient is discharged
Correct answer: For severe hypophosphatemia or associated cardiac, respiratory, or muscle dysfunction
For severe hypophosphatemia or associated cardiac, respiratory, or muscle dysfunction is correct because routine phosphate replacement does not improve outcomes and is reserved for severe depletion or related organ dysfunction. Replacing it in everyone, never replacing it, or waiting until discharge are not the appropriate criteria.
- A 27-year-old man with diabetic ketoacidosis is hemodynamically stable after fluids. The team emphasizes that the most important interventions to reverse the ketoacidosis are which combination?
- Bicarbonate and antibiotics
- Vasopressors and inotropes
- Fluids, insulin, and careful potassium management
- Diuretics and free water restriction
Correct answer: Fluids, insulin, and careful potassium management
Fluids, insulin, and careful potassium management is correct because volume repletion, an insulin infusion, and correction of potassium constitute the core therapy that reverses ketoacidosis. Bicarbonate is rarely needed, vasopressors are for shock, and diuretics with water restriction are inappropriate in a volume-depleted patient.
- A 70-year-old man presents with fever, hypotension (blood pressure 86/50), tachycardia, and a suspected urinary source of infection. Lactate is 4.2 mmol/L. What is the most appropriate initial fluid management?
- A 250 mL bolus then immediate vasopressors
- Diuresis to offload fluid
- No fluids until blood cultures result
- A 30 mL/kg crystalloid bolus
Correct answer: A 30 mL/kg crystalloid bolus
A 30 mL/kg crystalloid bolus is correct because septic shock with hypotension and elevated lactate is initially treated with prompt crystalloid resuscitation of about 30 mL/kg. A tiny bolus delays adequate resuscitation, diuresis worsens hypoperfusion, and withholding fluids pending cultures is dangerous.
- A 64-year-old woman in septic shock remains hypotensive with a mean arterial pressure of 55 despite adequate fluid resuscitation. Which vasopressor is the recommended first-line agent?
- Norepinephrine
- Dopamine
- Phenylephrine
- Low-dose vasopressin as monotherapy
Correct answer: Norepinephrine
Norepinephrine is correct because it is the first-line vasopressor in septic shock, effectively raising mean arterial pressure with a favorable profile. Dopamine causes more arrhythmias, phenylephrine is not first-line, and vasopressin is an adjunct rather than initial monotherapy.
- A 58-year-old man with septic shock is being resuscitated. What is the recommended target mean arterial pressure to guide vasopressor titration?
- At least 90 mmHg
- At least 65 mmHg
- Exactly 50 mmHg
- Whatever level abolishes all tachycardia
Correct answer: At least 65 mmHg
At least 65 mmHg is correct because a mean arterial pressure target of 65 mmHg balances adequate organ perfusion against the risks of excessive vasopressor use. A target of 90 is unnecessarily high, 50 is too low for organ perfusion, and titrating to abolish tachycardia is not a perfusion-based goal.
- A 72-year-old woman presents with suspected sepsis from pneumonia. Regarding antibiotics, what is the most appropriate timing and selection?
- Wait for culture results before any antibiotics
- Narrow-spectrum oral antibiotics only
- Broad-spectrum empiric antibiotics within the first hour, after obtaining cultures if it does not delay therapy
- Antibiotics only if fever exceeds 40 degrees Celsius
Correct answer: Broad-spectrum empiric antibiotics within the first hour, after obtaining cultures if it does not delay therapy
Broad-spectrum empiric antibiotics within the first hour, after obtaining cultures if it does not delay therapy is correct because early appropriate empiric antibiotics improve survival in sepsis, with cultures drawn first only if they do not delay treatment. Waiting for cultures, using narrow oral agents, or requiring extreme fever before treating all worsen outcomes.
- A 66-year-old man with sepsis has blood cultures drawn. What is the most important reason to obtain cultures before starting antibiotics when feasible?
- To delay antibiotic administration
- To rule out the need for fluids
- To confirm the patient has a fever
- To identify the organism and allow later narrowing of antibiotic therapy
Correct answer: To identify the organism and allow later narrowing of antibiotic therapy
To identify the organism and allow later narrowing of antibiotic therapy is correct because pre-antibiotic cultures increase the yield of pathogen identification, enabling de-escalation to targeted therapy. Cultures should not delay antibiotics, do not bear on fluid decisions, and are not for confirming fever.
- A 60-year-old woman with septic shock is on norepinephrine but remains hypotensive at high doses. Which adjunctive vasopressor is commonly added to reduce catecholamine requirements?
- Vasopressin
- An additional fluid bolus of 30 mL/kg every hour indefinitely
- Oral midodrine
- A beta-blocker infusion
Correct answer: Vasopressin
Vasopressin is correct because adding vasopressin to norepinephrine in refractory septic shock raises mean arterial pressure and spares catecholamine doses. Repeated large boluses risk fluid overload, oral midodrine is inadequate for shock, and a beta-blocker would worsen hypotension.
- A 68-year-old man with septic shock remains hypotensive despite adequate fluids and norepinephrine plus vasopressin. Which additional therapy is recommended for refractory shock?
- High-dose insulin
- Intravenous hydrocortisone
- Routine activated protein C
- Therapeutic hypothermia
Correct answer: Intravenous hydrocortisone
Intravenous hydrocortisone is correct because stress-dose corticosteroids are recommended in septic shock that remains vasopressor-dependent despite fluids and pressors. Insulin treats hyperglycemia, activated protein C has been withdrawn from use, and hypothermia is not a sepsis therapy.
- A 55-year-old man is evaluated for sepsis using the quick SOFA (qSOFA) criteria. Which set of findings represents the qSOFA components?
- Fever, leukocytosis, and tachycardia
- Hypoglycemia, bradycardia, and hypothermia
- Altered mentation, respiratory rate at least 22, and systolic blood pressure 100 or below
- Elevated creatinine, bilirubin, and platelets
Correct answer: Altered mentation, respiratory rate at least 22, and systolic blood pressure 100 or below
Altered mentation, respiratory rate at least 22, and systolic blood pressure 100 or below is correct because qSOFA uses these three bedside criteria to flag patients at higher risk of poor outcomes from infection. The other groupings describe systemic inflammatory response criteria or unrelated laboratory values rather than qSOFA.
- A 74-year-old woman with septic shock has source control considered. Which intervention exemplifies appropriate source control?
- Increasing the norepinephrine dose alone
- Giving additional crystalloid only
- Starting enteral nutrition
- Drainage of an intra-abdominal abscess
Correct answer: Drainage of an intra-abdominal abscess
Drainage of an intra-abdominal abscess is correct because source control means physically eliminating the infectious focus, such as draining an abscess or removing infected hardware, which is essential alongside antibiotics. Adjusting vasopressors, giving fluids, and nutrition support do not remove the source.
- A 62-year-old man with sepsis is reassessed after the initial fluid bolus to guide further resuscitation. Which approach best assesses his ongoing volume responsiveness?
- Dynamic measures such as passive leg raise or pulse pressure variation
- A single static central venous pressure target alone
- Daily weights only
- The presence or absence of thirst
Correct answer: Dynamic measures such as passive leg raise or pulse pressure variation
Dynamic measures such as passive leg raise or pulse pressure variation is correct because dynamic indices better predict fluid responsiveness than a single static pressure, helping avoid both under- and over-resuscitation. Central venous pressure alone is unreliable, daily weights are too slow, and thirst is not a resuscitation endpoint.
- A 70-year-old woman with septic shock has lactate clearance monitored during resuscitation. What does a falling lactate during treatment generally indicate?
- Worsening shock requiring more pressors
- Improving tissue perfusion and a favorable resuscitation response
- Resolution of the underlying infection
- A laboratory error
Correct answer: Improving tissue perfusion and a favorable resuscitation response
Improving tissue perfusion and a favorable resuscitation response is correct because clearing lactate reflects restored oxygen delivery to tissues and correlates with better outcomes in sepsis. A falling lactate suggests improvement rather than worsening, does not by itself prove the infection is cured, and is not an artifact.
- A 59-year-old man develops sepsis with hypotension. After fluids and antibiotics, his oxygenation worsens with bilateral infiltrates and a low ratio of arterial oxygen to inspired oxygen not explained by heart failure. What complication has developed?
- Simple atelectasis
- Pneumothorax
- Acute respiratory distress syndrome
- Pulmonary embolism
Correct answer: Acute respiratory distress syndrome
Acute respiratory distress syndrome is correct because sepsis is a leading cause of ARDS, defined by acute bilateral infiltrates and hypoxemia not due to cardiac failure. Atelectasis and pneumothorax produce different imaging and physiology, and embolism does not typically cause diffuse bilateral infiltrates.
- A patient with septic shock and ARDS requires mechanical ventilation. Which ventilator strategy improves survival in ARDS?
- High tidal volume ventilation to maximize oxygenation
- Permissive volutrauma with high plateau pressures
- Routine disconnection for frequent suctioning
- Low tidal volume lung-protective ventilation
Correct answer: Low tidal volume lung-protective ventilation
Low tidal volume lung-protective ventilation is correct because limiting tidal volumes (around 6 mL/kg of predicted body weight) and plateau pressures reduces ventilator-induced lung injury and improves survival in ARDS. High tidal volumes and high plateau pressures cause barotrauma, and routine disconnection is harmful.
- A 65-year-old man meets criteria for sepsis. Which definition best characterizes sepsis under current consensus terminology?
- Life-threatening organ dysfunction caused by a dysregulated host response to infection
- Any positive blood culture
- Fever alone in a hospitalized patient
- Isolated tachycardia without infection
Correct answer: Life-threatening organ dysfunction caused by a dysregulated host response to infection
Life-threatening organ dysfunction caused by a dysregulated host response to infection is correct because the modern definition centers on infection-driven organ dysfunction rather than inflammatory criteria alone. A positive culture, isolated fever, or tachycardia without organ dysfunction does not by itself define sepsis.
- A 71-year-old woman with septic shock has glucose levels checked frequently. What is the recommended general glycemic target during critical illness?
- Tight control below 80 mg/dL
- Moderate glucose control, generally targeting roughly 140-180 mg/dL
- Allowing glucose to exceed 300 mg/dL
- No glucose monitoring is needed
Correct answer: Moderate glucose control, generally targeting roughly 140-180 mg/dL
Moderate glucose control, generally targeting roughly 140-180 mg/dL is correct because moderate glycemic targets avoid both the hypoglycemia of intensive control and the harms of severe hyperglycemia in critically ill patients. A target below 80 risks hypoglycemia, permitting very high glucose is harmful, and monitoring is required.
- A 67-year-old man with suspected sepsis is being worked up to identify the infectious source. Which initial step is most appropriate to localize the source of infection?
- Empiric surgery without localization
- Withholding all diagnostics to start antibiotics faster
- A focused history, examination, and directed cultures and imaging based on suspected source
- Treating for fungemia in every patient
Correct answer: A focused history, examination, and directed cultures and imaging based on suspected source
A focused history, examination, and directed cultures and imaging based on suspected source is correct because identifying the infectious focus guides antibiotic choice and source control. Blind surgery, skipping diagnostics, and empiric antifungal therapy in all patients are not appropriate initial strategies.
- A 60-year-old woman with septic shock is on appropriate antibiotics, and cultures return identifying a susceptible organism. What is the recommended next step regarding antibiotics?
- Continue broad-spectrum agents indefinitely
- Add a second broad agent for redundancy
- Stop all antibiotics once the patient is afebrile for an hour
- De-escalate to targeted narrow-spectrum therapy based on susceptibilities
Correct answer: De-escalate to targeted narrow-spectrum therapy based on susceptibilities
De-escalate to targeted narrow-spectrum therapy based on susceptibilities is correct because narrowing antibiotics once the pathogen is known reduces resistance and adverse effects while maintaining efficacy. Indefinite broad-spectrum use, redundant agents, and premature cessation are inappropriate.
- A 56-year-old man with septic shock from a catheter-related bloodstream infection is identified. Beyond antibiotics, what specific source-control measure is indicated?
- Removal of the infected intravascular catheter
- Increasing fluids alone
- Switching antibiotics every 6 hours
- Permanent anticoagulation
Correct answer: Removal of the infected intravascular catheter
Removal of the infected intravascular catheter is correct because an infected device serves as an ongoing nidus that must be removed for source control. Additional fluids, frequent antibiotic switching, and anticoagulation do not eliminate the infected hardware.
- A 69-year-old woman with sepsis is being monitored for end-organ perfusion. Which finding indicates inadequate perfusion warranting more aggressive resuscitation?
- A normal lactate that is falling
- Rising creatinine, oliguria, and altered mental status
- Warm, well-perfused extremities
- Stable blood pressure at goal with good urine output
Correct answer: Rising creatinine, oliguria, and altered mental status
Rising creatinine, oliguria, and altered mental status is correct because these are markers of hypoperfusion and organ dysfunction prompting further resuscitation. A normalizing lactate, warm extremities, and stable pressure with good urine output indicate adequate perfusion.
- A 63-year-old man presents with sepsis and is started on the sepsis bundle. Which set of actions reflects the early hour-1 sepsis bundle priorities?
- Order an outpatient follow-up and discharge
- Give a single dose of an oral antibiotic and observe at home
- Measure lactate, obtain cultures, give broad-spectrum antibiotics, and begin fluids for hypotension or high lactate
- Start chronic corticosteroids and statins
Correct answer: Measure lactate, obtain cultures, give broad-spectrum antibiotics, and begin fluids for hypotension or high lactate
Measure lactate, obtain cultures, give broad-spectrum antibiotics, and begin fluids for hypotension or high lactate is correct because these are the core early sepsis bundle interventions linked to improved survival. Discharge, oral antibiotics at home, and chronic statins do not represent acute sepsis bundle care.
- A 72-year-old man with vomiting and poor oral intake for 3 days has a rising creatinine. Urinalysis is bland, the fractional excretion of sodium is below 1%, and the BUN-to-creatinine ratio is 25:1. Which type of acute kidney injury is most likely?
- Acute tubular necrosis
- Acute interstitial nephritis
- Postrenal obstruction
- Prerenal azotemia
Correct answer: Prerenal azotemia
Prerenal azotemia is correct because volume depletion with a low fractional excretion of sodium, high BUN-to-creatinine ratio, and bland urine indicates the kidneys are appropriately conserving sodium in response to hypoperfusion. Acute tubular necrosis shows a higher fractional excretion and casts, interstitial nephritis shows white cells, and obstruction would show hydronephrosis.
- A 65-year-old woman develops acute kidney injury after a prolonged episode of hypotension. Urine microscopy shows muddy brown granular casts, and the fractional excretion of sodium is above 2%. What is the most likely diagnosis?
- Acute tubular necrosis
- Prerenal azotemia
- Postrenal obstruction
- Minimal change disease
Correct answer: Acute tubular necrosis
Acute tubular necrosis is correct because muddy brown granular casts and a high fractional excretion of sodium after ischemic injury indicate intrinsic tubular damage with impaired sodium reabsorption. Prerenal injury has a low fractional excretion and bland sediment, obstruction shows hydronephrosis, and minimal change disease causes nephrotic-range proteinuria.
- A 78-year-old man with benign prostatic hyperplasia presents with anuria, suprapubic fullness, and a rising creatinine. What is the most appropriate next step to evaluate and relieve his acute kidney injury?
- Immediate hemodialysis
- Bladder catheterization and renal ultrasound to assess for obstruction
- A large fluid bolus
- A renal biopsy
Correct answer: Bladder catheterization and renal ultrasound to assess for obstruction
Bladder catheterization and renal ultrasound to assess for obstruction is correct because postrenal acute kidney injury from bladder outlet obstruction is quickly diagnosed and relieved by catheter placement with imaging to confirm. Dialysis is not first-line for relievable obstruction, a fluid bolus could worsen retention, and biopsy is unnecessary for obstructive injury.
- A 60-year-old man develops acute kidney injury, rash, fever, and eosinophilia about a week after starting a new antibiotic. Urinalysis shows white cells and white cell casts. What is the most likely cause?
- Acute tubular necrosis
- Prerenal azotemia
- Acute interstitial nephritis
- Rapidly progressive glomerulonephritis
Correct answer: Acute interstitial nephritis
Acute interstitial nephritis is correct because the triad of rash, fever, and eosinophilia with sterile pyuria after a culprit drug points to a hypersensitivity interstitial process. Acute tubular necrosis lacks the allergic features, prerenal azotemia has bland urine, and rapidly progressive glomerulonephritis shows red cell casts and active nephritic features.
- A 70-year-old woman with acute kidney injury has the following indications evaluated for urgent dialysis. Which is a classic indication for emergent renal replacement therapy?
- An isolated mild creatinine elevation
- A single low urine output reading
- Asymptomatic mild hyponatremia
- Refractory hyperkalemia, severe acidosis, fluid overload, or uremic complications
Correct answer: Refractory hyperkalemia, severe acidosis, fluid overload, or uremic complications
Refractory hyperkalemia, severe acidosis, fluid overload, or uremic complications is correct because these life-threatening derangements (often summarized as AEIOU) are the classic indications for urgent dialysis. A mild creatinine rise, a single low urine output, or mild hyponatremia do not by themselves require emergent dialysis.
- A 55-year-old man received intravenous contrast for a CT scan and develops a transient rise in creatinine peaking at 48-72 hours, then improving. Which preventive measure is most appropriate for high-risk patients receiving contrast?
- Adequate intravenous hydration before and after contrast
- Routine prophylactic dialysis
- High-dose loop diuretics before contrast
- Withholding all fluids to avoid overload
Correct answer: Adequate intravenous hydration before and after contrast
Adequate intravenous hydration before and after contrast is correct because volume expansion is the best-supported measure to reduce contrast-associated kidney injury in at-risk patients. Prophylactic dialysis is not indicated, loop diuretics can worsen injury, and withholding fluids increases risk.
- A 68-year-old woman on lisinopril develops acute kidney injury after starting a nonsteroidal anti-inflammatory drug and becoming volume depleted. What is the mechanism of her acute kidney injury?
- Direct toxic tubular necrosis from the ACE inhibitor
- Reduced glomerular perfusion pressure from combined afferent and efferent effects
- Allergic interstitial inflammation from the diuretic
- Crystal-induced obstruction
Correct answer: Reduced glomerular perfusion pressure from combined afferent and efferent effects
Reduced glomerular perfusion pressure from combined afferent and efferent effects is correct because NSAIDs constrict the afferent arteriole while ACE inhibitors dilate the efferent arteriole, and with volume depletion this drops glomerular filtration pressure (prerenal physiology). The scenario does not describe toxic necrosis, allergic interstitial nephritis, or crystal obstruction.
- A 62-year-old man with acute kidney injury has his medications reviewed. Which management step is essential when caring for any patient with acute kidney injury?
- Continue all home medications unchanged
- Maximize diuretic doses regardless of volume status
- Adjust or hold nephrotoxic and renally cleared medications and dose by renal function
- Avoid measuring potassium
Correct answer: Adjust or hold nephrotoxic and renally cleared medications and dose by renal function
Adjust or hold nephrotoxic and renally cleared medications and dose by renal function is correct because stopping nephrotoxins and adjusting renally cleared drug doses prevents further injury and toxicity. Continuing all drugs unchanged, blindly maximizing diuretics, and ignoring potassium are unsafe in acute kidney injury.
- A 75-year-old man has acute kidney injury, and a renal ultrasound reveals bilateral hydronephrosis. What does this finding indicate about the cause of his kidney injury?
- Intrinsic glomerular disease
- Prerenal hypoperfusion
- Acute tubular necrosis
- Postrenal obstruction of urinary outflow
Correct answer: Postrenal obstruction of urinary outflow
Postrenal obstruction of urinary outflow is correct because bilateral hydronephrosis reflects obstruction to urine flow causing back-pressure, a postrenal cause that is often reversible with decompression. Glomerular disease, prerenal hypoperfusion, and tubular necrosis do not produce bilateral hydronephrosis.
- A 58-year-old woman with crush injury develops acute kidney injury with tea-colored urine that is dipstick-positive for blood but shows few red cells on microscopy, along with a markedly elevated creatine kinase. What is the cause of her kidney injury?
- Pigment nephropathy from rhabdomyolysis
- Acute glomerulonephritis
- Prerenal azotemia
- Postrenal obstruction
Correct answer: Pigment nephropathy from rhabdomyolysis
Pigment nephropathy from rhabdomyolysis is correct because myoglobin from muscle breakdown causes a positive blood dipstick without red cells, and a high creatine kinase confirms rhabdomyolysis-induced tubular injury treated with aggressive fluids. Glomerulonephritis shows red cell casts, and prerenal and postrenal causes do not produce pigmenturia.
- A 64-year-old man with acute kidney injury has his volume status assessed at the bedside as part of the workup. Why is determining volume status a central early step?
- It determines the need for a renal biopsy in all cases
- It distinguishes prerenal hypoperfusion from other causes and guides whether to give or remove fluid
- It identifies the specific antibiotic to use
- It replaces the need for urinalysis
Correct answer: It distinguishes prerenal hypoperfusion from other causes and guides whether to give or remove fluid
It distinguishes prerenal hypoperfusion from other causes and guides whether to give or remove fluid is correct because volume assessment helps separate prerenal from intrinsic and postrenal injury and directs fluid management. It does not mandate biopsy in all cases, select antibiotics, or replace the diagnostic value of urinalysis.
- A 69-year-old woman develops oliguric acute kidney injury with hyperkalemia of 6.7 mEq/L and ECG changes despite medical therapy, plus worsening acidemia unresponsive to treatment. What is the most appropriate next step?
- Administer additional potassium
- Begin a high-potassium diet
- Initiate renal replacement therapy
- Restrict all intravenous access
Correct answer: Initiate renal replacement therapy
Initiate renal replacement therapy is correct because refractory hyperkalemia with ECG changes and severe acidemia not responding to medical management are urgent dialysis indications. Giving potassium, a high-potassium diet, or restricting access would worsen or fail to address the life-threatening derangements.
- A 60-year-old man with new acute kidney injury has urine microscopy showing dysmorphic red blood cells and red cell casts, along with hypertension and proteinuria. Which category of kidney injury does this suggest?
- Prerenal azotemia
- Postrenal obstruction
- Pure tubular necrosis
- Intrinsic glomerular disease (glomerulonephritis)
Correct answer: Intrinsic glomerular disease (glomerulonephritis)
Intrinsic glomerular disease (glomerulonephritis) is correct because dysmorphic red cells and red cell casts with hypertension and proteinuria indicate a nephritic glomerular process. Prerenal and postrenal causes have bland sediment, and isolated tubular necrosis shows granular casts rather than red cell casts.
- A 71-year-old man with sepsis develops acute kidney injury. As part of supportive management of his kidney injury, which intervention is most appropriate?
- Optimize hemodynamics and renal perfusion while avoiding further nephrotoxins
- Start chronic dialysis regardless of recovery potential
- Give nephrotoxic antibiotics preferentially
- Severely restrict fluids despite hypotension
Correct answer: Optimize hemodynamics and renal perfusion while avoiding further nephrotoxins
Optimize hemodynamics and renal perfusion while avoiding further nephrotoxins is correct because restoring perfusion and removing nephrotoxic insults supports recovery of sepsis-associated acute kidney injury. Committing to chronic dialysis prematurely, choosing nephrotoxic drugs, and restricting fluids in a hypotensive patient are inappropriate.
- A 66-year-old woman recovering from acute tubular necrosis enters a phase of high urine output with risk of electrolyte loss. What is this phase called, and what is the key management concern?
- The oliguric phase, requiring fluid restriction
- The polyuric recovery phase, requiring monitoring and replacement of fluids and electrolytes
- Complete recovery requiring no monitoring
- Obstructive phase requiring catheterization
Correct answer: The polyuric recovery phase, requiring monitoring and replacement of fluids and electrolytes
The polyuric recovery phase, requiring monitoring and replacement of fluids and electrolytes is correct because as tubules recover they may produce large urine volumes, risking dehydration and electrolyte depletion that must be replaced. This describes recovery rather than the oliguric phase, still requires monitoring, and is not an obstructive phenomenon.
- A 59-year-old man is found to have acute kidney injury on routine labs. To characterize the injury, which combination of tests is most informative in the initial workup?
- A renal biopsy in every patient first
- Serum lipase alone
- Urinalysis with microscopy, urine electrolytes for fractional excretion, and renal ultrasound
- A 24-hour electroencephalogram
Correct answer: Urinalysis with microscopy, urine electrolytes for fractional excretion, and renal ultrasound
Urinalysis with microscopy, urine electrolytes for fractional excretion, and renal ultrasound is correct because these tests categorize the injury as prerenal, intrinsic, or postrenal and reveal obstruction. Biopsy is reserved for selected cases, lipase assesses the pancreas, and an electroencephalogram evaluates the brain.
- A 73-year-old man on a loop diuretic and an ACE inhibitor presents with prerenal acute kidney injury from volume depletion. What is the most appropriate initial treatment?
- Increase the diuretic dose
- Begin urgent dialysis
- Add a second antihypertensive
- Restore intravascular volume with intravenous fluids and reduce offending agents
Correct answer: Restore intravascular volume with intravenous fluids and reduce offending agents
Restore intravascular volume with intravenous fluids and reduce offending agents is correct because prerenal injury from volume depletion is reversed by replenishing volume and holding diuretics and renin-angiotensin blockers. Increasing the diuretic, adding antihypertensives, or rushing to dialysis would worsen hypoperfusion or be unnecessary.
- A 67-year-old woman with multiple myeloma develops acute kidney injury. Which myeloma-related mechanism most directly causes intrinsic kidney injury?
- Light chain (cast) nephropathy
- Bladder outlet obstruction
- Renal artery stenosis
- Simple dehydration only
Correct answer: Light chain (cast) nephropathy
Light chain (cast) nephropathy is correct because filtered monoclonal light chains form obstructing casts and are toxic to tubules, a hallmark intrinsic cause of kidney injury in myeloma. Outlet obstruction and artery stenosis are not the primary myeloma mechanism, and dehydration alone does not explain cast nephropathy.
- A 61-year-old man develops acute kidney injury after an arterial procedure, with livedo reticularis, eosinophilia, and a slowly rising creatinine days later. What is the most likely cause?
- Contrast-induced nephropathy resolving in 48 hours
- Atheroembolic (cholesterol embolization) kidney injury
- Prerenal azotemia
- Acute interstitial nephritis
Correct answer: Atheroembolic (cholesterol embolization) kidney injury
Atheroembolic (cholesterol embolization) kidney injury is correct because cholesterol crystal emboli after vascular instrumentation cause a subacute, stepwise creatinine rise with livedo reticularis and eosinophilia. Contrast nephropathy peaks earlier and recovers, prerenal azotemia is hemodynamic, and interstitial nephritis follows a drug exposure with different features.
- A 45-year-old previously healthy man presents with fever, productive cough, and a lobar infiltrate on chest radiograph. He has no comorbidities and a CURB-65 score of 0. What is the most appropriate management?
- Admission to the intensive care unit
- Intravenous antibiotics for at least a week inpatient
- Outpatient treatment with oral antibiotics
- No antibiotics and supportive care alone
Correct answer: Outpatient treatment with oral antibiotics
Outpatient treatment with oral antibiotics is correct because a healthy patient with a low CURB-65 score can be safely treated as an outpatient with oral therapy. Intensive care and prolonged inpatient intravenous therapy are unnecessary for low-risk disease, and antibiotics are indicated for bacterial pneumonia.
- A 70-year-old man with community-acquired pneumonia has confusion, a BUN of 24 mg/dL, respiratory rate of 32, blood pressure of 88/56, and is over 65 years old. What does his CURB-65 score indicate about disposition?
- A low score suitable for outpatient care
- No need for antibiotics
- Immediate discharge with oral antibiotics
- A high score indicating need for hospitalization and consideration of intensive care
Correct answer: A high score indicating need for hospitalization and consideration of intensive care
A high score indicating need for hospitalization and consideration of intensive care is correct because he meets all five CURB-65 criteria, predicting high mortality and the need for inpatient and possibly intensive care management. A high score is incompatible with outpatient care or discharge, and antibiotics are required.
- A 52-year-old woman without comorbidities is diagnosed with community-acquired pneumonia and will be treated as an outpatient. Which empiric oral regimen is appropriate for a previously healthy patient?
- Amoxicillin or a macrolide or doxycycline per local resistance patterns
- Intravenous vancomycin and an antipseudomonal agent
- An antifungal agent
- No antibiotic, only an antitussive
Correct answer: Amoxicillin or a macrolide or doxycycline per local resistance patterns
Amoxicillin or a macrolide or doxycycline per local resistance patterns is correct because healthy outpatients with community-acquired pneumonia are treated empirically with these agents targeting typical and atypical pathogens. Broad intravenous coverage is for severe or resistant cases, antifungals are not indicated, and antibiotics are needed for bacterial pneumonia.
- A 60-year-old man with COPD and diabetes is admitted with community-acquired pneumonia to a general ward. Which empiric inpatient regimen is appropriate for a non-ICU patient with comorbidities?
- Oral amoxicillin alone
- A beta-lactam plus a macrolide, or a respiratory fluoroquinolone
- An antiviral agent alone
- No antibiotics pending cultures
Correct answer: A beta-lactam plus a macrolide, or a respiratory fluoroquinolone
A beta-lactam plus a macrolide, or a respiratory fluoroquinolone is correct because hospitalized patients with comorbidities require coverage of typical and atypical organisms via combination therapy or a respiratory fluoroquinolone. Oral monotherapy is for healthy outpatients, antivirals do not treat bacterial pneumonia, and withholding antibiotics is unsafe.
- A 38-year-old college student presents with a gradual onset of dry cough, low-grade fever, malaise, and a chest radiograph showing patchy interstitial infiltrates out of proportion to mild examination findings. Which organism is the most likely cause?
- Streptococcus pneumoniae causing classic lobar consolidation
- Pseudomonas aeruginosa
- Mycoplasma pneumoniae
- Legionella in an immunocompetent young person without exposure
Correct answer: Mycoplasma pneumoniae
Mycoplasma pneumoniae is correct because atypical 'walking pneumonia' in a young patient presents with gradual dry cough, constitutional symptoms, and interstitial infiltrates that exceed examination findings. Pneumococcus causes lobar consolidation, Pseudomonas affects those with structural lung disease, and Legionella typically follows specific exposures with more systemic illness.
- A 65-year-old man hospitalized with community-acquired pneumonia is started on appropriate antibiotics. When should clinical response typically be reassessed to guide therapy?
- Only after 2 weeks of therapy
- Immediately within the first hour to declare failure
- Never, as therapy is fixed once started
- Within 48 to 72 hours, evaluating fever, oxygenation, and clinical stability
Correct answer: Within 48 to 72 hours, evaluating fever, oxygenation, and clinical stability
Within 48 to 72 hours, evaluating fever, oxygenation, and clinical stability is correct because clinical improvement is typically assessed at 48 to 72 hours to confirm response or detect failure and complications. Waiting 2 weeks delays needed changes, judging within an hour is premature, and therapy should be reassessed rather than fixed.
- A 58-year-old alcoholic man presents with pneumonia and a chest radiograph showing a right upper lobe infiltrate with a bulging fissure and currant-jelly sputum. Which organism is classically associated with this presentation?
- Klebsiella pneumoniae
- Mycoplasma pneumoniae
- Respiratory syncytial virus
- Chlamydophila pneumoniae
Correct answer: Klebsiella pneumoniae
Klebsiella pneumoniae is correct because in alcoholic and debilitated patients, Klebsiella causes a severe pneumonia with thick currant-jelly sputum and a bulging fissure from voluminous exudate. Mycoplasma and Chlamydophila cause atypical pneumonia, and respiratory syncytial virus is not associated with this classic picture.
- A 50-year-old man with community-acquired pneumonia improves clinically and is hemodynamically stable, afebrile, and tolerating oral intake while on intravenous antibiotics. What is the most appropriate next step in his antibiotic therapy?
- Continue intravenous therapy for at least 14 more days
- Switch from intravenous to oral antibiotics to complete the course
- Stop antibiotics immediately after 2 doses
- Add a second broad-spectrum agent
Correct answer: Switch from intravenous to oral antibiotics to complete the course
Switch from intravenous to oral antibiotics to complete the course is correct because clinically stable, improving patients who can take oral medication should be transitioned to oral therapy to shorten hospital stay. Prolonged unnecessary intravenous therapy, premature cessation, and adding agents without indication are not appropriate.
- A 68-year-old woman recovers from community-acquired pneumonia. Which vaccination strategy is appropriate to reduce her risk of future pneumococcal disease?
- Avoid all vaccines after pneumonia
- Give only an annual influenza vaccine and no pneumococcal vaccine ever
- Administer recommended pneumococcal vaccination per age and risk guidelines
- Vaccinate only if she develops sepsis
Correct answer: Administer recommended pneumococcal vaccination per age and risk guidelines
Administer recommended pneumococcal vaccination per age and risk guidelines is correct because pneumococcal vaccination is recommended for older adults and at-risk patients to prevent invasive disease. Avoiding vaccines, omitting pneumococcal vaccination entirely, or restricting it to those who develop sepsis are not appropriate preventive strategies.
- A 62-year-old man with severe community-acquired pneumonia requires vasopressors and mechanical ventilation. Where should he be managed and with what antibiotic breadth?
- On a general ward with oral antibiotics
- At home with follow-up
- With no antibiotics until cultures return
- In the intensive care unit with broad empiric coverage including atypicals
Correct answer: In the intensive care unit with broad empiric coverage including atypicals
In the intensive care unit with broad empiric coverage including atypicals is correct because septic shock and respiratory failure define severe pneumonia requiring intensive care and prompt broad empiric antibiotics. A general ward with oral therapy, home care, and delaying antibiotics are all inadequate for severe disease.
- A 44-year-old man with pneumonia and a recent hotel stay with a contaminated water system develops high fevers, diarrhea, hyponatremia, and confusion. Which pathogen should be suspected and tested for with a urinary antigen?
- Legionella pneumophila
- Streptococcus pneumoniae
- Mycoplasma pneumoniae
- Haemophilus influenzae
Correct answer: Legionella pneumophila
Legionella pneumophila is correct because Legionella classically causes pneumonia with prominent gastrointestinal symptoms, hyponatremia, and confusion, often after water-source exposure, and is detected by urinary antigen. The other organisms do not characteristically produce this constellation of extrapulmonary features.
- A 55-year-old woman with community-acquired pneumonia has a parapneumonic effusion on imaging. When does such an effusion require chest tube drainage?
- For any small simple effusion
- When it is a complicated effusion or empyema with low pH, low glucose, or pus
- Only after 3 weeks regardless of features
- Never, as all effusions resolve with antibiotics
Correct answer: When it is a complicated effusion or empyema with low pH, low glucose, or pus
When it is a complicated effusion or empyema with low pH, low glucose, or pus is correct because complicated parapneumonic effusions and empyemas require drainage in addition to antibiotics. Small simple effusions often resolve with antibiotics alone, arbitrary time-based drainage is incorrect, and not all effusions resolve without intervention.
- A 47-year-old man is diagnosed with community-acquired pneumonia. What is the recommended general duration of antibiotic therapy for an uncomplicated case that responds promptly?
- At least 21 days for all patients
- A single dose only
- A minimum of about 5 days with clinical stability before stopping
- Indefinite suppressive therapy
Correct answer: A minimum of about 5 days with clinical stability before stopping
A minimum of about 5 days with clinical stability before stopping is correct because uncomplicated community-acquired pneumonia is typically treated for at least 5 days provided the patient is afebrile and clinically stable. Three weeks is excessive for uncomplicated disease, a single dose is insufficient, and indefinite therapy is not indicated.
- A 72-year-old woman with dementia and difficulty swallowing develops pneumonia with an infiltrate in the right lower lobe and a history of choking with meals. Which type of pneumonia is most likely, and what does treatment target?
- Atypical pneumonia, with a macrolide only
- Viral pneumonia, with no antibiotics
- Fungal pneumonia, with an antifungal
- Aspiration pneumonia, with antibiotics covering oral flora
Correct answer: Aspiration pneumonia, with antibiotics covering oral flora
Aspiration pneumonia, with antibiotics covering oral flora is correct because impaired swallowing and dependent infiltrates suggest aspiration, and therapy targets oropharyngeal organisms. The presentation is not typical of purely atypical, viral, or fungal pneumonia.
- A 60-year-old man with community-acquired pneumonia has a chest radiograph that initially shows an infiltrate. After successful treatment, when is follow-up imaging to confirm radiographic resolution generally considered, particularly in older smokers?
- Several weeks later in select patients to ensure resolution and exclude underlying malignancy
- Daily chest radiographs during treatment
- Never, as imaging follow-up is contraindicated
- Immediately at the end of antibiotics in all patients
Correct answer: Several weeks later in select patients to ensure resolution and exclude underlying malignancy
Several weeks later in select patients to ensure resolution and exclude underlying malignancy is correct because delayed follow-up imaging in higher-risk patients such as older smokers confirms resolution and helps exclude an obstructing lesion. Daily films are unnecessary, follow-up is not contraindicated, and infiltrates may take weeks to clear so immediate end-of-treatment imaging is not standard.
- A 58-year-old man hospitalized with pneumonia has blood and sputum cultures and a urinary antigen panel sent. What is the main purpose of obtaining microbiologic testing in hospitalized community-acquired pneumonia?
- To delay starting antibiotics
- To identify the pathogen and allow targeted, narrowed therapy
- To determine the discharge date
- To replace the chest radiograph
Correct answer: To identify the pathogen and allow targeted, narrowed therapy
To identify the pathogen and allow targeted, narrowed therapy is correct because microbiologic data in hospitalized patients can guide de-escalation to pathogen-directed treatment. Testing should not delay antibiotics, does not by itself set the discharge date, and does not replace imaging.
- A 50-year-old man with community-acquired pneumonia is at risk for which complication if a localized collection of pus develops within the lung parenchyma with an air-fluid level on imaging?
- Pulmonary embolism
- Spontaneous pneumothorax
- Lung abscess
- Pleurisy without effusion
Correct answer: Lung abscess
Lung abscess is correct because a cavitary lesion with an air-fluid level represents a lung abscess, a suppurative complication of pneumonia often requiring prolonged antibiotics. A pulmonary embolism, pneumothorax, and uncomplicated pleurisy do not produce a parenchymal pus collection with an air-fluid level.
- A 63-year-old woman with pneumonia is assessed for whether she needs hospitalization. Besides CURB-65, which validated tool is commonly used to estimate severity and guide the decision for inpatient versus outpatient care?
- The Wells score
- The CHA2DS2-VASc score
- The Glasgow-Blatchford score
- The Pneumonia Severity Index
Correct answer: The Pneumonia Severity Index
The Pneumonia Severity Index is correct because it stratifies pneumonia mortality risk and helps decide on site of care alongside CURB-65. The Wells score assesses pulmonary embolism probability, CHA2DS2-VASc estimates stroke risk in atrial fibrillation, and the Glasgow-Blatchford score risk-stratifies gastrointestinal bleeding.
- A 56-year-old man with diabetes and recent influenza develops a rapidly worsening pneumonia with cavitation. Which secondary bacterial pathogen should be considered after influenza?
- Staphylococcus aureus
- Mycoplasma pneumoniae
- Chlamydophila pneumoniae
- Moraxella catarrhalis as the typical post-influenza cavitary organism
Correct answer: Staphylococcus aureus
Staphylococcus aureus is correct because post-influenza secondary bacterial pneumonia, sometimes with cavitation, is classically caused by Staphylococcus aureus (and pneumococcus). Mycoplasma and Chlamydophila cause atypical non-cavitary disease, and Moraxella is not the characteristic post-influenza cavitary pathogen.
- A 49-year-old man with community-acquired pneumonia and no risk factors for resistant organisms is treated empirically. Why is atypical coverage included in empiric regimens for community-acquired pneumonia?
- Because all pneumonias are fungal
- Because atypical organisms like Mycoplasma, Chlamydophila, and Legionella are common and not covered by beta-lactams alone
- Because atypicals require antiviral therapy
- Because beta-lactams reliably cover atypicals
Correct answer: Because atypical organisms like Mycoplasma, Chlamydophila, and Legionella are common and not covered by beta-lactams alone
Because atypical organisms like Mycoplasma, Chlamydophila, and Legionella are common and not covered by beta-lactams alone is correct because these pathogens lack a cell wall or are intracellular, so a macrolide, doxycycline, or fluoroquinolone is added or used. Pneumonias are not all fungal, atypicals do not require antivirals, and beta-lactams do not reliably cover them.
- A 67-year-old man with COPD presents with increased dyspnea, increased sputum volume, and a change to purulent sputum over 2 days. He is tachypneic with wheezing and accessory muscle use. What is the most appropriate initial bronchodilator therapy?
- An inhaled corticosteroid alone
- A long-acting beta-agonist alone for acute relief
- Inhaled short-acting beta-agonist plus a short-acting anticholinergic
- Intravenous magnesium as first-line bronchodilation
Correct answer: Inhaled short-acting beta-agonist plus a short-acting anticholinergic
Inhaled short-acting beta-agonist plus a short-acting anticholinergic is correct because acute COPD exacerbations are treated first with short-acting bronchodilators such as albuterol and ipratropium to relieve airflow obstruction. Inhaled corticosteroids alone are not acute bronchodilators, long-acting agents are maintenance therapy, and magnesium is not first-line.
- A 64-year-old woman with a COPD exacerbation has increased dyspnea, increased sputum purulence, and increased sputum volume (all three cardinal symptoms). What treatment, in addition to bronchodilators and steroids, is indicated?
- No antibiotics regardless of sputum changes
- Antifungal therapy
- Long-term oral steroids only
- A course of antibiotics
Correct answer: A course of antibiotics
A course of antibiotics is correct because the presence of increased sputum purulence with the other cardinal symptoms indicates a likely bacterial trigger warranting antibiotics in a COPD exacerbation. Withholding antibiotics despite purulence, antifungals, and indefinite oral steroids are not appropriate.
- A 70-year-old man with a COPD exacerbation is started on systemic corticosteroids. What is the typical recommended approach to steroid therapy in an acute COPD exacerbation?
- A short course of systemic corticosteroids, commonly around 5 days
- High-dose intravenous steroids for several weeks
- Inhaled steroids only with no systemic course
- Lifelong daily oral steroids
Correct answer: A short course of systemic corticosteroids, commonly around 5 days
A short course of systemic corticosteroids, commonly around 5 days is correct because brief systemic steroid courses improve outcomes in COPD exacerbations while limiting adverse effects. Prolonged high-dose intravenous steroids, inhaled-only therapy for an acute exacerbation, and chronic daily oral steroids are not the standard approach.
- A 68-year-old man with a severe COPD exacerbation has worsening respiratory acidosis with a pH of 7.28 and a rising carbon dioxide level, but he is awake and able to cooperate. What is the most appropriate next intervention?
- Immediate intubation regardless of mental status
- Noninvasive positive pressure ventilation
- High-flow oxygen alone to a saturation of 100%
- Sedation to reduce work of breathing
Correct answer: Noninvasive positive pressure ventilation
Noninvasive positive pressure ventilation is correct because BiPAP reduces work of breathing, improves ventilation, and lowers intubation rates and mortality in hypercapnic COPD exacerbations when the patient can protect the airway. Immediate intubation is not yet required, excessive oxygen can worsen hypercapnia, and sedation can suppress respiratory drive.
- A 65-year-old man with COPD presents with an exacerbation and a low oxygen saturation. What oxygen saturation target is recommended to avoid worsening carbon dioxide retention?
- A target of 100 percent saturation
- A target below 80 percent
- A target oxygen saturation of about 88 to 92 percent
- Oxygen is contraindicated in COPD
Correct answer: A target oxygen saturation of about 88 to 92 percent
A target oxygen saturation of about 88 to 92 percent is correct because controlled oxygen therapy relieves hypoxemia while minimizing the risk of carbon dioxide retention in COPD. Aiming for 100 percent can worsen hypercapnia, a target below 80 percent is dangerously hypoxemic, and oxygen is needed, not contraindicated.
- A 72-year-old woman with COPD has frequent exacerbations. Which maintenance therapy reduces the frequency of future COPD exacerbations?
- Short-acting bronchodilators used only as needed without maintenance therapy
- Chronic systemic steroids for everyone
- Routine prophylactic antifungals
- Long-acting bronchodilators, with inhaled corticosteroids added in select patients
Correct answer: Long-acting bronchodilators, with inhaled corticosteroids added in select patients
Long-acting bronchodilators, with inhaled corticosteroids added in select patients is correct because long-acting muscarinic antagonists and beta-agonists, with inhaled corticosteroids in those with frequent exacerbations or eosinophilia, reduce exacerbation frequency. Relying only on rescue inhalers, chronic systemic steroids for all, and prophylactic antifungals are not appropriate strategies.
- A 60-year-old man with COPD is counseled on the single most effective intervention to slow disease progression and reduce mortality. What is it?
- Smoking cessation
- Daily inhaled antibiotics
- Routine annual bronchoscopy
- High-protein supplementation
Correct answer: Smoking cessation
Smoking cessation is correct because stopping smoking slows the decline in lung function and reduces mortality more than any other intervention in COPD. Inhaled antibiotics, routine bronchoscopy, and protein supplementation do not provide comparable disease-modifying benefit.
- A 66-year-old man with severe COPD and chronic resting hypoxemia has a measured arterial oxygen saturation of 87 percent at rest on room air repeatedly. Which long-term therapy improves survival in this setting?
- Chronic oral corticosteroids
- Long-term home oxygen therapy
- Daily nebulized saline
- Routine theophylline
Correct answer: Long-term home oxygen therapy
Long-term home oxygen therapy is correct because supplemental oxygen improves survival in COPD patients with chronic severe resting hypoxemia. Chronic oral steroids carry significant harm, nebulized saline does not improve survival, and theophylline has a narrow therapeutic window and is not a survival therapy.
- A 58-year-old man with COPD is being evaluated for the underlying diagnosis. Which test confirms the diagnosis of COPD by demonstrating non-fully-reversible airflow obstruction?
- A chest radiograph alone
- Arterial blood gas alone
- Spirometry showing a reduced FEV1/FVC ratio after bronchodilator
- A complete blood count
Correct answer: Spirometry showing a reduced FEV1/FVC ratio after bronchodilator
Spirometry showing a reduced FEV1/FVC ratio after bronchodilator is correct because a post-bronchodilator FEV1/FVC ratio below 0.70 confirms persistent airflow limitation diagnostic of COPD. A chest radiograph, blood gas, and blood count support evaluation but do not establish the diagnosis.
- A 69-year-old man with a COPD exacerbation is on noninvasive ventilation but becomes obtunded with worsening acidosis and is no longer protecting his airway. What is the most appropriate next step?
- Continue noninvasive ventilation indefinitely
- Discontinue all ventilatory support
- Administer a sedative and observe
- Endotracheal intubation and invasive mechanical ventilation
Correct answer: Endotracheal intubation and invasive mechanical ventilation
Endotracheal intubation and invasive mechanical ventilation is correct because failure of noninvasive ventilation with depressed consciousness and inability to protect the airway requires intubation. Continuing failed noninvasive support, withdrawing support, and sedating a patient with respiratory failure are unsafe.
- A 63-year-old woman with frequent COPD exacerbations despite optimal inhaler therapy and chronic bronchitis is considered for an add-on oral agent to reduce exacerbations. Which agent is appropriate in selected patients?
- Roflumilast, a phosphodiesterase-4 inhibitor
- A long-acting nitrate
- An oral antifungal
- Chronic systemic corticosteroids
Correct answer: Roflumilast, a phosphodiesterase-4 inhibitor
Roflumilast, a phosphodiesterase-4 inhibitor is correct because it reduces exacerbations in patients with severe COPD, chronic bronchitis, and a history of exacerbations. Nitrates and antifungals have no role in this indication, and chronic systemic corticosteroids cause more harm than benefit as a maintenance strategy.
- A 71-year-old man recovering from a COPD exacerbation is being discharged. Which intervention reduces his risk of future infections that trigger exacerbations?
- Avoidance of all vaccines
- Influenza and pneumococcal vaccination
- Prophylactic antifungal therapy
- Routine systemic steroids at home
Correct answer: Influenza and pneumococcal vaccination
Influenza and pneumococcal vaccination is correct because vaccinations reduce respiratory infections that precipitate COPD exacerbations. Avoiding vaccines increases infection risk, antifungal prophylaxis is not indicated, and home systemic steroids are not a preventive strategy.
- A 68-year-old man presents with a COPD exacerbation. Which finding on examination suggests impending respiratory failure and the need for escalation of care?
- Mild expiratory wheeze that improves with bronchodilators
- Pink, well-perfused appearance with normal mentation
- A silent chest with diminished air movement and altered mental status
- Resolution of accessory muscle use after treatment
Correct answer: A silent chest with diminished air movement and altered mental status
A silent chest with diminished air movement and altered mental status is correct because markedly reduced air movement and depressed consciousness signal severe obstruction and impending failure. Wheeze that improves, a comfortable appearance, and resolving accessory muscle use indicate improvement rather than deterioration.
- A 60-year-old man with COPD asks why he should enroll in pulmonary rehabilitation. What is the primary benefit of pulmonary rehabilitation in COPD?
- Reversal of airflow obstruction to normal
- Cure of the underlying emphysema
- Elimination of the need for any medications
- Improved exercise capacity, symptoms, and quality of life
Correct answer: Improved exercise capacity, symptoms, and quality of life
Improved exercise capacity, symptoms, and quality of life is correct because pulmonary rehabilitation enhances functional capacity and well-being and reduces dyspnea, though it does not reverse the structural disease. It does not normalize obstruction, cure emphysema, or eliminate medication needs.
- A 65-year-old man with a COPD exacerbation is given supplemental oxygen, but a repeat blood gas shows rising carbon dioxide and a falling pH with new drowsiness. What is the most likely explanation?
- Excessive oxygen has worsened carbon dioxide retention and hypercapnia
- The oxygen has cured the exacerbation
- He has developed a pulmonary embolism from oxygen
- The blood gas is unrelated to oxygen therapy
Correct answer: Excessive oxygen has worsened carbon dioxide retention and hypercapnia
Excessive oxygen has worsened carbon dioxide retention and hypercapnia is correct because over-oxygenation in COPD can blunt hypoxic drive and worsen ventilation-perfusion matching, raising carbon dioxide and causing somnolence. Oxygen does not cure the exacerbation, does not cause embolism, and is directly relevant to the rising carbon dioxide.
- A 59-year-old man with COPD has a maintenance regimen reviewed. Which inhaler class is the cornerstone of long-term symptom control and exacerbation reduction in most patients with COPD?
- Short-acting bronchodilators as the sole maintenance therapy
- Long-acting bronchodilators (long-acting muscarinic antagonists and beta-agonists)
- Systemic corticosteroids
- Leukotriene receptor antagonists as first-line
Correct answer: Long-acting bronchodilators (long-acting muscarinic antagonists and beta-agonists)
Long-acting bronchodilators (long-acting muscarinic antagonists and beta-agonists) is correct because long-acting bronchodilators are the foundation of maintenance therapy in COPD. Short-acting agents alone are insufficient maintenance, systemic steroids are not for chronic control, and leukotriene antagonists are not first-line in COPD.
- A 70-year-old woman with a COPD exacerbation has a chest radiograph performed. What is the primary purpose of imaging during an acute exacerbation?
- To confirm the diagnosis of COPD itself
- To measure the FEV1
- To identify alternative or contributing diagnoses such as pneumonia, pneumothorax, or heart failure
- To replace pulse oximetry
Correct answer: To identify alternative or contributing diagnoses such as pneumonia, pneumothorax, or heart failure
To identify alternative or contributing diagnoses such as pneumonia, pneumothorax, or heart failure is correct because imaging during an exacerbation evaluates for precipitants and mimics. COPD is diagnosed by spirometry, imaging does not measure FEV1, and it does not replace oximetry.
- A 67-year-old man with COPD develops sudden severe unilateral chest pain and dyspnea during an exacerbation, with decreased breath sounds and hyperresonance on one side. What complication should be suspected?
- Acute myocardial infarction with a normal lung exam
- Pleural effusion with dullness
- Simple bronchospasm
- Pneumothorax
Correct answer: Pneumothorax
Pneumothorax is correct because COPD patients with bullae are prone to spontaneous pneumothorax, which presents with sudden unilateral pain, dyspnea, decreased breath sounds, and hyperresonance. Myocardial infarction does not cause unilateral hyperresonance, effusion causes dullness, and simple bronchospasm would not cause these unilateral findings.
- A 62-year-old man with COPD and an exacerbation is prescribed antibiotics. Which factor most appropriately guides whether antibiotics are indicated in a COPD exacerbation?
- The presence of increased sputum purulence and other cardinal symptoms or need for ventilatory support
- The patient's age alone
- A normal white blood cell count
- The absence of any sputum changes
Correct answer: The presence of increased sputum purulence and other cardinal symptoms or need for ventilatory support
The presence of increased sputum purulence and other cardinal symptoms or need for ventilatory support is correct because purulent sputum and severe exacerbations requiring ventilation indicate a likely bacterial cause warranting antibiotics. Age alone, a normal white count, and the absence of sputum changes do not by themselves drive the decision to treat with antibiotics.
- A 73-year-old man with end-stage COPD and severe persistent dyspnea despite maximal therapy is being managed for symptom relief. Which intervention is appropriate for refractory dyspnea in advanced disease?
- High-dose benzodiazepines as first-line
- Low-dose opioids for symptomatic relief of dyspnea
- Discontinuation of all bronchodilators
- Aggressive diuresis regardless of volume status
Correct answer: Low-dose opioids for symptomatic relief of dyspnea
Low-dose opioids for symptomatic relief of dyspnea is correct because carefully titrated low-dose opioids relieve refractory dyspnea in advanced COPD as part of palliative care. High-dose benzodiazepines are not first-line and risk respiratory depression, stopping bronchodilators removes benefit, and indiscriminate diuresis is not indicated.
- A 64-year-old man with COPD wants to understand the difference between chronic bronchitis and emphysema. Which statement is accurate?
- Both are defined solely by chest radiograph findings
- Emphysema is defined by sputum production and bronchitis by alveolar destruction
- Chronic bronchitis is defined clinically by a productive cough for at least 3 months in 2 consecutive years, while emphysema involves alveolar destruction
- Neither is part of COPD
Correct answer: Chronic bronchitis is defined clinically by a productive cough for at least 3 months in 2 consecutive years, while emphysema involves alveolar destruction
Chronic bronchitis is defined clinically by a productive cough for at least 3 months in 2 consecutive years, while emphysema involves alveolar destruction is correct because these are the standard clinical and pathologic definitions of the two COPD phenotypes. They are not defined solely by radiographs, the definitions in the third option are reversed, and both are components of COPD.
- A 68-year-old man with frequent COPD exacerbations is found to have a high blood eosinophil count. How does this finding influence maintenance therapy decisions?
- Higher eosinophils mean inhaled corticosteroids should be avoided
- Eosinophils have no relationship to therapy choice
- Eosinophilia mandates lifelong systemic steroids
- Higher eosinophil counts favor adding an inhaled corticosteroid to reduce exacerbations
Correct answer: Higher eosinophil counts favor adding an inhaled corticosteroid to reduce exacerbations
Higher eosinophil counts favor adding an inhaled corticosteroid to reduce exacerbations is correct because blood eosinophilia predicts a better response to inhaled corticosteroids for exacerbation reduction in COPD. Higher eosinophils support rather than oppose inhaled steroids, the relationship is clinically meaningful, and systemic steroids are not mandated.
- A 66-year-old nonsmoker with early-onset COPD and basilar emphysema is found to have a low serum level of a protective protein, and a sibling has liver disease. Which deficiency should be suspected?
- Alpha-1 antitrypsin deficiency
- Iron deficiency
- Vitamin D deficiency
- Surfactant protein excess
Correct answer: Alpha-1 antitrypsin deficiency
Alpha-1 antitrypsin deficiency is correct because early-onset emphysema in a nonsmoker with basilar predominance and a family history of liver disease suggests this hereditary protease inhibitor deficiency. Iron and vitamin D deficiencies do not cause emphysema, and surfactant excess is not a recognized cause.
- A 70-year-old man with a COPD exacerbation is being treated. Which combination represents the core pharmacologic management of a typical exacerbation?
- Long-term oxygen and antifungals only
- Short-acting bronchodilators, systemic corticosteroids, and antibiotics when indicated
- Diuretics and nitrates
- Antivirals and statins
Correct answer: Short-acting bronchodilators, systemic corticosteroids, and antibiotics when indicated
Short-acting bronchodilators, systemic corticosteroids, and antibiotics when indicated is correct because these three components form the backbone of acute COPD exacerbation treatment. Antifungals, diuretics with nitrates, and antivirals with statins do not constitute exacerbation therapy.
- A 61-year-old man with COPD is being assessed for severity using the GOLD framework. Which two factors does the GOLD assessment combine to guide therapy?
- Blood pressure and heart rate
- Serum sodium and potassium
- Symptom burden and exacerbation history
- Body temperature and white count
Correct answer: Symptom burden and exacerbation history
Symptom burden and exacerbation history is correct because the GOLD assessment integrates symptom severity and exacerbation frequency to assign treatment groups in COPD. Vital signs, electrolytes, and infection markers are not the components of this assessment.
- A 65-year-old woman with COPD presents with an exacerbation triggered by a viral upper respiratory infection. What is the most common type of trigger for COPD exacerbations?
- Excessive vitamin intake
- Cold weather alone with no infection in most cases
- Routine vaccination
- Respiratory infections, both viral and bacterial
Correct answer: Respiratory infections, both viral and bacterial
Respiratory infections, both viral and bacterial is correct because respiratory tract infections are the leading precipitants of COPD exacerbations. Vitamin intake and vaccination do not trigger exacerbations, and while environmental factors contribute, infections are the most common identifiable cause.
- A 69-year-old man with a COPD exacerbation receiving treatment shows improvement and is preparing for discharge. Which step is most important to reduce readmission and future exacerbations?
- Ensure correct inhaler technique, optimize maintenance therapy, and arrange follow-up
- Discontinue all maintenance inhalers
- Avoid follow-up appointments
- Prescribe indefinite oral antibiotics
Correct answer: Ensure correct inhaler technique, optimize maintenance therapy, and arrange follow-up
Ensure correct inhaler technique, optimize maintenance therapy, and arrange follow-up is correct because proper inhaler use, optimized maintenance therapy, and timely follow-up reduce relapse and readmission. Stopping maintenance inhalers, skipping follow-up, and indefinite antibiotics are counterproductive.
- A 60-year-old man with COPD has chronic hypercapnia and recurrent exacerbations with respiratory failure. Which long-term therapy may benefit selected patients with persistent severe hypercapnia after an exacerbation?
- Continuous high-flow oxygen targeting 100 percent saturation
- Home noninvasive ventilation
- Chronic neuromuscular blockade
- Daily diuretics
Correct answer: Home noninvasive ventilation
Home noninvasive ventilation is correct because long-term home noninvasive ventilation can reduce exacerbations and improve outcomes in selected COPD patients with persistent hypercapnia. Over-oxygenation worsens retention, chronic neuromuscular blockade is dangerous, and diuretics do not treat hypercapnia.
- A 72-year-old man with COPD is found to have developed right heart failure with peripheral edema and elevated neck veins from chronic hypoxemia and pulmonary hypertension. What is this complication called?
- Left ventricular aneurysm
- Constrictive pericarditis
- Cor pulmonale
- Aortic regurgitation
Correct answer: Cor pulmonale
Cor pulmonale is correct because chronic hypoxic pulmonary vasoconstriction raises pulmonary pressures and leads to right heart strain and failure in COPD. A left ventricular aneurysm, constrictive pericarditis, and aortic regurgitation are distinct cardiac conditions not caused by chronic hypoxemic lung disease in this way.
- A 58-year-old man presents with a blood pressure of 220/130 and a severe headache, blurred vision, and confusion. Fundoscopy shows papilledema. What distinguishes this hypertensive emergency from hypertensive urgency?
- The absolute blood pressure value alone
- A history of prior hypertension
- The patient's age
- The presence of acute end-organ damage
Correct answer: The presence of acute end-organ damage
The presence of acute end-organ damage is correct because a hypertensive emergency is defined by severe hypertension with acute target-organ injury such as encephalopathy or papilledema, whereas urgency lacks such damage. The absolute pressure, prior history, and age do not define the distinction.
- A 60-year-old woman presents with a hypertensive emergency and acute hypertensive encephalopathy. What is the general goal for the initial rate of blood pressure reduction in most hypertensive emergencies?
- Reduce mean arterial pressure by no more than about 25 percent in the first hour
- Normalize the blood pressure to 120/80 within minutes
- Lower the systolic pressure to below 90 immediately
- Avoid any blood pressure reduction
Correct answer: Reduce mean arterial pressure by no more than about 25 percent in the first hour
Reduce mean arterial pressure by no more than about 25 percent in the first hour is correct because controlled, gradual reduction prevents organ hypoperfusion in most hypertensive emergencies. Rapid normalization or overly aggressive lowering risks ischemic injury, and withholding treatment fails to protect end organs.
- A 55-year-old man presents with a hypertensive emergency. Which medication is most appropriate for controlled blood pressure reduction in most hypertensive emergencies?
- A single large dose of oral nifedipine
- An intravenous titratable agent such as nicardipine or labetalol
- Sublingual nifedipine for rapid drop
- No medication, only observation
Correct answer: An intravenous titratable agent such as nicardipine or labetalol
An intravenous titratable agent such as nicardipine or labetalol is correct because intravenous, easily titratable agents allow smooth, controlled blood pressure reduction in a hypertensive emergency. Large oral or sublingual nifedipine doses cause unpredictable, precipitous drops, and observation alone is inadequate when end-organ damage is present.
- A 62-year-old man with a hypertensive emergency is found to have an acute aortic dissection. What is the target for blood pressure and heart rate control, and which agents are preferred?
- Lower blood pressure slowly over 24 hours
- Use a vasodilator alone without rate control
- Rapidly lower systolic pressure to about 100-120 and heart rate below 60 using a beta-blocker first, then a vasodilator
- Avoid heart rate control entirely
Correct answer: Rapidly lower systolic pressure to about 100-120 and heart rate below 60 using a beta-blocker first, then a vasodilator
Rapidly lower systolic pressure to about 100-120 and heart rate below 60 using a beta-blocker first, then a vasodilator is correct because aortic dissection requires rapid reduction of shear stress with beta-blockade before adding vasodilators to avoid reflex tachycardia. Slow reduction, vasodilator-only therapy, and omitting rate control all increase the risk of dissection propagation.
- A 50-year-old man with a hypertensive emergency has an acute ischemic stroke. How does the presence of acute ischemic stroke modify the blood pressure management?
- Blood pressure should be lowered aggressively to normal immediately
- Blood pressure should be raised in all cases
- Blood pressure is ignored in stroke
- Blood pressure is generally permitted to remain higher unless it exceeds specific thresholds or thrombolysis is planned
Correct answer: Blood pressure is generally permitted to remain higher unless it exceeds specific thresholds or thrombolysis is planned
Blood pressure is generally permitted to remain higher unless it exceeds specific thresholds or thrombolysis is planned is correct because permissive hypertension preserves perfusion to the ischemic penumbra unless very high or thrombolysis requires lowering to specific targets. Aggressive normalization can extend the infarct, raising it further is harmful, and it cannot be ignored.
- A 48-year-old pregnant woman at 34 weeks presents with a blood pressure of 168/112, headache, and proteinuria. Which antihypertensive agents are considered safe and first-line for severe hypertension in pregnancy?
- Intravenous labetalol or hydralazine, or oral nifedipine
- An ACE inhibitor
- An angiotensin receptor blocker
- Intravenous nitroprusside as first-line
Correct answer: Intravenous labetalol or hydralazine, or oral nifedipine
Intravenous labetalol or hydralazine, or oral nifedipine is correct because these agents safely control severe hypertension in pregnancy. ACE inhibitors and angiotensin receptor blockers are teratogenic and contraindicated, and nitroprusside risks fetal cyanide toxicity and is not first-line.
- A 59-year-old man with a hypertensive emergency complicated by acute pulmonary edema is being treated. Which intravenous agents are particularly useful in this setting?
- A pure beta-blocker alone
- Nitroglycerin or nitroprusside combined with a loop diuretic
- An oral calcium channel blocker only
- A vasopressor infusion
Correct answer: Nitroglycerin or nitroprusside combined with a loop diuretic
Nitroglycerin or nitroprusside combined with a loop diuretic is correct because vasodilators reduce preload and afterload while a diuretic relieves congestion in hypertensive acute pulmonary edema. A beta-blocker alone may worsen acute heart failure, oral therapy acts too slowly, and a vasopressor would raise pressure dangerously.
- A 53-year-old man presents with severe hypertension of 200/120 but no symptoms and no evidence of acute end-organ damage on evaluation. How should this hypertensive urgency be managed?
- Immediate intravenous therapy to normalize pressure rapidly
- Admission to the intensive care unit for all such patients
- Gradual blood pressure reduction over hours to days with oral agents and close follow-up
- No treatment of any kind
Correct answer: Gradual blood pressure reduction over hours to days with oral agents and close follow-up
Gradual blood pressure reduction over hours to days with oral agents and close follow-up is correct because hypertensive urgency without end-organ damage is managed with oral medications and outpatient follow-up rather than rapid intravenous lowering. Rapid normalization risks hypoperfusion, routine intensive care is unnecessary, and untreated severe hypertension is inappropriate.
- A 64-year-old man with a hypertensive emergency is started on intravenous sodium nitroprusside. With prolonged use or in renal impairment, which toxicity should be monitored?
- Hyperkalemia
- Pulmonary fibrosis
- Hemolytic anemia from iron overload
- Cyanide and thiocyanate toxicity
Correct answer: Cyanide and thiocyanate toxicity
Cyanide and thiocyanate toxicity is correct because nitroprusside metabolism releases cyanide that can accumulate, especially with prolonged infusion or renal dysfunction. Hyperkalemia, pulmonary fibrosis, and iron-overload hemolysis are not the characteristic toxicities of nitroprusside.
- A 45-year-old man presents with episodic severe hypertension, headache, palpitations, and diaphoresis, with markedly elevated catecholamine metabolites. He develops a hypertensive crisis. Which condition should be suspected, and which agent is preferred for blood pressure control?
- Pheochromocytoma, controlled with alpha-blockade before any beta-blockade
- Essential hypertension, controlled with a beta-blocker first
- Primary hyperaldosteronism, controlled with a diuretic alone
- White-coat hypertension requiring no treatment
Correct answer: Pheochromocytoma, controlled with alpha-blockade before any beta-blockade
Pheochromocytoma, controlled with alpha-blockade before any beta-blockade is correct because the episodic catecholamine surges suggest pheochromocytoma, and alpha-blockade must precede beta-blockade to avoid unopposed alpha vasoconstriction. Beta-blockade first is dangerous here, this is not simple essential hypertension or aldosteronism, and it is not white-coat hypertension.
- A 60-year-old woman with a hypertensive emergency and acute kidney injury is being treated. Which intravenous agent is often favored because it can improve renal perfusion?
- An angiotensin receptor blocker bolus
- Fenoldopam
- Oral chlorthalidone
- A nonselective beta-blocker
Correct answer: Fenoldopam
Fenoldopam is correct because this dopamine-1 receptor agonist lowers blood pressure while potentially preserving or improving renal blood flow in hypertensive emergencies with kidney involvement. Oral and renin-angiotensin agents are less suitable acutely, and a nonselective beta-blocker is not preferred for renal protection in this setting.
- A 57-year-old man with a hypertensive emergency has the underlying cause investigated. Which is an important reversible secondary cause of severe hypertension to evaluate?
- Iron deficiency anemia
- Seasonal allergies
- Renal artery stenosis, primary aldosteronism, or pheochromocytoma
- Mild vitamin D insufficiency
Correct answer: Renal artery stenosis, primary aldosteronism, or pheochromocytoma
Renal artery stenosis, primary aldosteronism, or pheochromocytoma is correct because these are classic secondary causes of severe or resistant hypertension that should be sought, particularly in younger or refractory patients. Anemia, allergies, and mild vitamin D insufficiency are not causes of hypertensive emergency.
- A 52-year-old man presents with a hypertensive emergency and acute heart failure with reduced ejection fraction. Which agent should generally be avoided because of its negative inotropic effect during acute decompensation?
- A vasodilator such as nitroglycerin
- A loop diuretic
- Nitroprusside for afterload reduction
- Intravenous labetalol pushed aggressively as a sole agent
Correct answer: Intravenous labetalol pushed aggressively as a sole agent
Intravenous labetalol pushed aggressively as a sole agent is correct because aggressive beta-blockade can depress contractility in acutely decompensated systolic heart failure, so vasodilators and diuretics are preferred. Nitroglycerin, loop diuretics, and nitroprusside reduce preload or afterload and are appropriate in this scenario.
- A 61-year-old man with a hypertensive emergency presents with chest pain and ECG changes consistent with acute coronary syndrome. Which intravenous agent helps both control blood pressure and relieve myocardial ischemia?
- Nitroglycerin
- Hydralazine, which causes reflex tachycardia
- A pure vasoconstrictor
- An intravenous fluid bolus
Correct answer: Nitroglycerin
Nitroglycerin is correct because it lowers blood pressure while dilating coronary arteries and reducing preload, relieving ischemia in hypertensive emergency with acute coronary syndrome. Hydralazine can provoke reflex tachycardia that worsens ischemia, a vasoconstrictor would raise pressure, and a fluid bolus is inappropriate.
- A 49-year-old woman with a hypertensive emergency is being monitored during treatment. What is the purpose of using intravenous, short-acting, titratable agents rather than long-acting oral drugs?
- They are cheaper than oral agents
- They allow precise, controllable, and rapidly reversible blood pressure adjustment
- They eliminate the need for blood pressure monitoring
- They permanently cure hypertension
Correct answer: They allow precise, controllable, and rapidly reversible blood pressure adjustment
They allow precise, controllable, and rapidly reversible blood pressure adjustment is correct because titratable intravenous agents permit careful, moment-to-moment control to avoid overcorrection in a hypertensive emergency. Cost is not the rationale, monitoring remains essential, and these agents control rather than cure hypertension.
- A 56-year-old man recovering from a hypertensive emergency is transitioned to oral therapy. What is the appropriate longer-term goal after the acute period?
- Maintain the blood pressure deliberately high to avoid hypoperfusion long-term
- Stop all antihypertensives once discharged
- Gradually achieve guideline blood pressure targets with oral agents and address adherence and secondary causes
- Continue intravenous therapy indefinitely
Correct answer: Gradually achieve guideline blood pressure targets with oral agents and address adherence and secondary causes
Gradually achieve guideline blood pressure targets with oral agents and address adherence and secondary causes is correct because after stabilization, the focus shifts to sustained oral control, adherence, and evaluation for secondary causes. Maintaining high pressures, stopping medications, and indefinite intravenous therapy are all inappropriate long-term strategies.
- A 47-year-old man with poor medication adherence presents repeatedly with hypertensive emergencies. What is a major contributing factor to recurrent hypertensive emergencies that should be addressed?
- Excessive sleep
- High dietary fiber intake
- Routine exercise
- Nonadherence to antihypertensive medications
Correct answer: Nonadherence to antihypertensive medications
Nonadherence to antihypertensive medications is correct because abruptly stopping or inconsistently taking antihypertensives is a leading cause of recurrent hypertensive crises, so adherence support is essential. Adequate sleep, fiber, and exercise are beneficial and not causes of hypertensive emergency.
- A 63-year-old man presents with a blood pressure of 210/125 and acute hypertensive encephalopathy with headache, nausea, and altered mentation that improves as blood pressure is controlled. What is the mechanism of hypertensive encephalopathy?
- Failure of cerebral autoregulation leading to cerebral edema
- Embolic occlusion of a large cerebral artery
- Rupture of a berry aneurysm
- Demyelination of central white matter from a toxin
Correct answer: Failure of cerebral autoregulation leading to cerebral edema
Failure of cerebral autoregulation leading to cerebral edema is correct because severe hypertension overwhelms cerebral autoregulation, causing vasogenic edema that reverses with blood pressure control. It is not an embolic stroke, an aneurysm rupture, or a toxic demyelinating process.
- A 54-year-old man with a hypertensive emergency is being evaluated for end-organ damage. Which workup is appropriate to detect target-organ involvement?
- A single blood pressure reading only
- ECG, fundoscopy, neurologic assessment, renal function, urinalysis, and cardiac and chest evaluation as indicated
- A psychiatric evaluation alone
- Only a complete blood count
Correct answer: ECG, fundoscopy, neurologic assessment, renal function, urinalysis, and cardiac and chest evaluation as indicated
ECG, fundoscopy, neurologic assessment, renal function, urinalysis, and cardiac and chest evaluation as indicated is correct because assessing the heart, brain, eyes, and kidneys identifies the acute target-organ damage that defines an emergency. A single reading, psychiatric evaluation alone, or an isolated blood count do not adequately screen for end-organ injury.
- A 60-year-old woman presents with a hypertensive emergency and an intracerebral hemorrhage on imaging. How is blood pressure managed in acute intracerebral hemorrhage?
- Leave the blood pressure untreated regardless of level
- Lower it to below 90 systolic immediately
- Carefully lower blood pressure to a target range to limit hematoma expansion while avoiding excessive drops
- Raise the blood pressure to improve perfusion
Correct answer: Carefully lower blood pressure to a target range to limit hematoma expansion while avoiding excessive drops
Carefully lower blood pressure to a target range to limit hematoma expansion while avoiding excessive drops is correct because controlled lowering in acute intracerebral hemorrhage reduces hematoma growth while maintaining cerebral perfusion. Leaving it untreated, dropping it too low, or raising it are all inappropriate.
- A 51-year-old man with severe hypertension is found to have grade III to IV retinopathy with hemorrhages, exudates, and papilledema. What does this finding signify?
- A benign incidental finding requiring no action
- Chronic stable hypertension with no urgency
- A primary ophthalmologic disease unrelated to blood pressure
- Acute hypertensive target-organ damage qualifying as a hypertensive emergency
Correct answer: Acute hypertensive target-organ damage qualifying as a hypertensive emergency
Acute hypertensive target-organ damage qualifying as a hypertensive emergency is correct because advanced hypertensive retinopathy with papilledema is evidence of acute end-organ injury defining an emergency requiring prompt controlled treatment. It is neither benign nor merely chronic, and it is directly caused by the severe hypertension.
- A 58-year-old man with a hypertensive emergency is treated with an intravenous infusion. Which property makes labetalol useful in many hypertensive emergencies?
- It provides combined alpha- and beta-blockade to lower blood pressure without reflex tachycardia
- It is a pure vasoconstrictor
- It selectively raises heart rate
- It has no effect on blood pressure
Correct answer: It provides combined alpha- and beta-blockade to lower blood pressure without reflex tachycardia
It provides combined alpha- and beta-blockade to lower blood pressure without reflex tachycardia is correct because labetalol's dual blockade lowers blood pressure while controlling heart rate, making it broadly useful in hypertensive emergencies. It is not a vasoconstrictor, does not raise heart rate, and clearly lowers blood pressure.
- A 62-year-old man presents with a hypertensive emergency. Which initial principle should guide the rate of treatment in conditions other than aortic dissection?
- Always normalize blood pressure within 10 minutes
- Avoid lowering blood pressure too quickly to prevent ischemic organ injury
- Never lower the blood pressure
- Lower the blood pressure only after 24 hours
Correct answer: Avoid lowering blood pressure too quickly to prevent ischemic organ injury
Avoid lowering blood pressure too quickly to prevent ischemic organ injury is correct because abrupt reductions can cause cerebral, coronary, or renal hypoperfusion, so gradual controlled lowering is the rule outside of dissection. Immediate normalization is harmful, withholding treatment fails to protect organs, and a 24-hour delay is too slow when organs are at risk.
- A 55-year-old man with a hypertensive emergency and acute pulmonary edema is dyspneic and hypoxemic. In addition to vasodilators and diuretics, which supportive measure may be needed?
- A large intravenous fluid bolus
- Immediate dialysis for all patients
- Noninvasive positive pressure ventilation for respiratory support
- A vasopressor to raise blood pressure
Correct answer: Noninvasive positive pressure ventilation for respiratory support
Noninvasive positive pressure ventilation for respiratory support is correct because BiPAP improves oxygenation and reduces work of breathing in hypertensive pulmonary edema while pharmacologic therapy lowers pressure. Fluids worsen edema, routine dialysis is not indicated, and a vasopressor would worsen the hypertension.
- A 50-year-old man on clonidine abruptly stops the medication and develops rebound severe hypertension with tachycardia and agitation. What is the appropriate management of clonidine withdrawal hypertensive crisis?
- Give a beta-blocker alone as first-line
- Withhold all treatment
- Administer high-dose diuretics alone
- Reinstitute clonidine and control symptoms, avoiding unopposed beta-blockade
Correct answer: Reinstitute clonidine and control symptoms, avoiding unopposed beta-blockade
Reinstitute clonidine and control symptoms, avoiding unopposed beta-blockade is correct because abrupt clonidine cessation causes catecholamine rebound best treated by restarting the agent, while beta-blockade alone risks unopposed alpha effects. Withholding treatment and diuretics alone do not address the rebound mechanism.
- A 59-year-old woman with a hypertensive emergency is asked about her symptoms. Which symptom constellation most suggests acute end-organ involvement rather than asymptomatic severe hypertension?
- Chest pain, dyspnea, focal neurologic deficits, or visual changes
- A mild dull headache that resolves with rest
- Occasional nasal congestion
- Stable chronic joint pain
Correct answer: Chest pain, dyspnea, focal neurologic deficits, or visual changes
Chest pain, dyspnea, focal neurologic deficits, or visual changes is correct because these symptoms point to cardiac, neurologic, or ocular target-organ damage defining an emergency. A mild resolving headache, nasal congestion, and chronic joint pain are not indicators of acute end-organ injury.
- A 53-year-old man with a hypertensive emergency requires careful intra-arterial monitoring. Why is invasive arterial blood pressure monitoring sometimes used during treatment?
- To deliver the antihypertensive medication directly
- To provide continuous, accurate beat-to-beat measurement during rapid titration
- To replace the need for any medication
- To measure cardiac output exclusively
Correct answer: To provide continuous, accurate beat-to-beat measurement during rapid titration
To provide continuous, accurate beat-to-beat measurement during rapid titration is correct because an arterial line gives real-time pressure data to guide precise titration and avoid overshoot in a hypertensive emergency. It is not used to administer the drug, does not replace medication, and is not primarily for measuring cardiac output.
- A 61-year-old man presents with a hypertensive emergency and acute decompensated kidney function with hematuria and proteinuria, consistent with malignant hypertension causing renal injury. What is the appropriate goal of blood pressure control here?
- Immediate normalization to prevent any renal flow
- Permissive severe hypertension to maintain filtration
- Controlled gradual reduction to preserve renal perfusion while limiting ongoing damage
- No blood pressure treatment
Correct answer: Controlled gradual reduction to preserve renal perfusion while limiting ongoing damage
Controlled gradual reduction to preserve renal perfusion while limiting ongoing damage is correct because malignant hypertension with renal involvement requires careful lowering to halt vascular injury without precipitating ischemic acute kidney injury from overcorrection. Immediate normalization can worsen renal ischemia, persistent severe hypertension perpetuates damage, and no treatment is unsafe.
- A 57-year-old man with a hypertensive emergency stabilizes after appropriate intravenous therapy. Which monitoring location is most appropriate during the acute phase of a true hypertensive emergency?
- Discharge home immediately
- A routine outpatient clinic with monthly visits
- An unmonitored general ward bed without telemetry
- An intensive care or monitored setting with continuous blood pressure monitoring
Correct answer: An intensive care or monitored setting with continuous blood pressure monitoring
An intensive care or monitored setting with continuous blood pressure monitoring is correct because hypertensive emergencies with end-organ damage and intravenous titratable agents require close, continuous monitoring. Immediate discharge, routine clinic follow-up, and an unmonitored bed are inadequate during the acute phase.
- A 68-year-old man with small cell lung cancer has a serum sodium of 118 mEq/L. He is clinically euvolemic with low serum osmolality, an inappropriately concentrated urine, and elevated urine sodium. What is the most likely diagnosis?
- Syndrome of inappropriate antidiuretic hormone secretion
- Hypovolemic hyponatremia from diuretics
- Hypervolemic hyponatremia from heart failure
- Pseudohyponatremia from hyperlipidemia
Correct answer: Syndrome of inappropriate antidiuretic hormone secretion
Syndrome of inappropriate antidiuretic hormone secretion is correct because euvolemic hypotonic hyponatremia with concentrated urine and elevated urine sodium, often with a malignancy, is the classic profile of SIADH. Hypovolemic and hypervolemic causes have abnormal volume status, and pseudohyponatremia shows normal osmolality.
- A 75-year-old woman presents with a sodium of 116 mEq/L and new seizures. Which approach to correction is most appropriate for severe symptomatic hyponatremia?
- Rapid full correction to normal within a few hours
- Hypertonic 3% saline to raise sodium modestly and relieve symptoms
- Free water administration
- Fluid restriction alone with no saline
Correct answer: Hypertonic 3% saline to raise sodium modestly and relieve symptoms
Hypertonic 3% saline to raise sodium modestly and relieve symptoms is correct because severe symptomatic hyponatremia with seizures requires careful hypertonic saline to raise sodium just enough to control symptoms. Rapid full correction risks osmotic demyelination, free water worsens hyponatremia, and restriction alone is too slow for seizures.
- A 60-year-old man with chronic hyponatremia of 115 mEq/L is corrected too rapidly and several days later develops dysarthria, dysphagia, and quadriparesis. What is the cause of his deterioration?
- Cerebral edema from overhydration
- Recurrent hyponatremia
- Osmotic demyelination syndrome
- Acute ischemic stroke
Correct answer: Osmotic demyelination syndrome
Osmotic demyelination syndrome is correct because overly rapid correction of chronic hyponatremia causes demyelination, classically producing dysarthria, dysphagia, and paralysis days later. Cerebral edema results from under-correction, recurrent hyponatremia would not cause this picture, and the delayed pattern is characteristic of demyelination rather than acute stroke.
- A 70-year-old woman on a thiazide diuretic presents with hyponatremia, signs of volume depletion, low urine sodium when off the diuretic effect, and orthostatic hypotension. What is the mechanism of her hyponatremia?
- Euvolemic SIADH
- Hypervolemic hyponatremia from cirrhosis
- Primary polydipsia
- Hypovolemic hyponatremia with antidiuretic hormone release from volume depletion
Correct answer: Hypovolemic hyponatremia with antidiuretic hormone release from volume depletion
Hypovolemic hyponatremia with antidiuretic hormone release from volume depletion is correct because volume loss triggers antidiuretic hormone, retaining water and lowering sodium, often precipitated by thiazides. The clinical hypovolemia argues against euvolemic SIADH or hypervolemic states, and primary polydipsia shows dilute urine without volume depletion.
- A 55-year-old man with decompensated cirrhosis and ascites has a serum sodium of 124 mEq/L. He is volume overloaded with edema. What is the most appropriate initial management of his hyponatremia?
- Fluid restriction and treatment of the underlying cirrhosis
- Aggressive hypertonic saline regardless of symptoms
- Liberal free water intake
- Immediate sodium supplementation tablets as first-line
Correct answer: Fluid restriction and treatment of the underlying cirrhosis
Fluid restriction and treatment of the underlying cirrhosis is correct because hypervolemic hyponatremia in cirrhosis is dilutional and managed by restricting water and addressing the liver disease. Hypertonic saline is reserved for severe symptoms, free water worsens it, and sodium tablets are not the first-line therapy in this volume-overloaded state.
- A 50-year-old man presents with a measured sodium of 128 mEq/L but a normal serum osmolality and severe hypertriglyceridemia. What does this represent?
- True hypotonic hyponatremia
- Pseudohyponatremia from a laboratory artifact
- Hypertonic hyponatremia from hyperglycemia
- SIADH
Correct answer: Pseudohyponatremia from a laboratory artifact
Pseudohyponatremia from a laboratory artifact is correct because elevated lipids displace plasma water and falsely lower the measured sodium while osmolality remains normal. True hypotonic hyponatremia shows low osmolality, hyperglycemia causes a hypertonic picture, and SIADH produces genuine hypotonic hyponatremia.
- A 65-year-old woman with SIADH has persistent hyponatremia despite fluid restriction. Which additional therapy can be used to treat refractory SIADH?
- Large volumes of intravenous free water
- Desmopressin
- A vasopressin receptor antagonist or oral salt with a loop diuretic
- Unrestricted oral fluids
Correct answer: A vasopressin receptor antagonist or oral salt with a loop diuretic
A vasopressin receptor antagonist or oral salt with a loop diuretic is correct because when fluid restriction is insufficient in SIADH, promoting water excretion with a vaptan or salt plus a loop diuretic raises sodium. Free water and desmopressin worsen water retention, and unrestricted fluids defeat the therapy.
- A 58-year-old marathon runner collapses after drinking large volumes of water during a race and is found to have a sodium of 122 mEq/L with confusion. What is the cause of his hyponatremia?
- SIADH from a tumor
- Hypovolemic hyponatremia from blood loss
- Hypertonic hyponatremia from hyperglycemia
- Exercise-associated hyponatremia from excessive water intake
Correct answer: Exercise-associated hyponatremia from excessive water intake
Exercise-associated hyponatremia from excessive water intake is correct because consuming large volumes of hypotonic fluid during endurance exercise dilutes sodium, sometimes severely. There is no tumor or blood loss described, and the glucose is not elevated to cause a hypertonic process.
- A 62-year-old man is evaluated for hyponatremia. Which is the correct first step in the diagnostic approach to hyponatremia?
- Measure serum osmolality to confirm true hypotonic hyponatremia
- Immediately give hypertonic saline to all patients
- Start fluid restriction before any labs
- Assume SIADH without further testing
Correct answer: Measure serum osmolality to confirm true hypotonic hyponatremia
Measure serum osmolality to confirm true hypotonic hyponatremia is correct because confirming hypotonicity excludes pseudohyponatremia and hypertonic causes before assessing volume status and urine studies. Empiric hypertonic saline, blind fluid restriction, and assuming SIADH skip essential diagnostic steps.
- A 70-year-old man with hyponatremia is assessed, and his volume status is determined to be a critical branch point in the workup. After confirming hypotonicity, what is the next key assessment?
- Serum potassium alone
- Clinical volume status (hypovolemic, euvolemic, or hypervolemic)
- The patient's blood pressure goal
- The white blood cell count
Correct answer: Clinical volume status (hypovolemic, euvolemic, or hypervolemic)
Clinical volume status (hypovolemic, euvolemic, or hypervolemic) is correct because categorizing volume status directs the differential and treatment of hypotonic hyponatremia. Potassium, a blood pressure goal, and the white count are not the central branch point in this algorithm.
- A 48-year-old woman with hyponatremia has urine osmolality measured. A low urine osmolality (dilute urine) in a hyponatremic patient most suggests which condition?
- SIADH with concentrated urine
- Hypovolemic hyponatremia with high antidiuretic hormone
- Primary polydipsia or appropriate water excretion
- Hypothyroidism causing water retention
Correct answer: Primary polydipsia or appropriate water excretion
Primary polydipsia or appropriate water excretion is correct because maximally dilute urine indicates the kidney is appropriately excreting free water, as in primary polydipsia where water intake exceeds excretory capacity. SIADH and hypovolemic states produce inappropriately concentrated urine, and hypothyroid water retention does not give dilute urine.
- A 66-year-old man with chronic hyponatremia is corrected. What is a generally accepted maximum rate of sodium correction in the first 24 hours to avoid osmotic demyelination?
- At least 20 mEq/L in 24 hours
- Correction to a normal sodium within 4 hours
- No limit is needed for chronic hyponatremia
- No more than about 8 to 10 mEq/L in 24 hours
Correct answer: No more than about 8 to 10 mEq/L in 24 hours
No more than about 8 to 10 mEq/L in 24 hours is correct because limiting the rate of correction in chronic hyponatremia prevents osmotic demyelination. Correcting by 20 mEq/L, normalizing within hours, or applying no limit all risk demyelinating injury.
- A 59-year-old woman with profound hypothyroidism presents with hyponatremia. How does severe hypothyroidism contribute to hyponatremia?
- Reduced cardiac output and impaired free water excretion promote water retention
- It causes massive sodium loss in the urine
- It produces pseudohyponatremia from proteins
- It causes hypertonic hyponatremia
Correct answer: Reduced cardiac output and impaired free water excretion promote water retention
Reduced cardiac output and impaired free water excretion promote water retention is correct because hypothyroidism reduces water clearance, leading to dilutional hyponatremia that improves with thyroid hormone replacement. It does not cause renal sodium wasting, pseudohyponatremia, or a hypertonic state.
- A 72-year-old man with hyponatremia and adrenal insufficiency is identified. Why does adrenal insufficiency cause hyponatremia?
- It causes excessive renal water excretion
- Cortisol deficiency leads to increased antidiuretic hormone and impaired water excretion
- It produces hypertonic hyponatremia
- It has no effect on sodium
Correct answer: Cortisol deficiency leads to increased antidiuretic hormone and impaired water excretion
Cortisol deficiency leads to increased antidiuretic hormone and impaired water excretion is correct because glucocorticoid deficiency removes the normal suppression of antidiuretic hormone, causing water retention and hyponatremia that corrects with cortisol replacement. It does not cause excessive water excretion, a hypertonic state, or no effect.
- A 55-year-old man presents with euvolemic hyponatremia. Which initial therapy is the mainstay for mild to moderate asymptomatic SIADH?
- Aggressive hypertonic saline
- Intravenous free water
- Fluid restriction
- Desmopressin administration
Correct answer: Fluid restriction
Fluid restriction is correct because limiting water intake is the first-line treatment for asymptomatic or mild SIADH, allowing sodium to rise gradually. Hypertonic saline is reserved for severe symptoms, and free water or desmopressin would worsen the hyponatremia.
- A 63-year-old woman with severe symptomatic hyponatremia is being treated with hypertonic saline. What clinical parameter most importantly guides ongoing therapy?
- Daily weight only
- Blood pressure alone
- Urine color
- Frequent serial sodium measurements to monitor the correction rate
Correct answer: Frequent serial sodium measurements to monitor the correction rate
Frequent serial sodium measurements to monitor the correction rate is correct because close monitoring of sodium ensures the rise stays within safe limits and prevents overcorrection. Weight, blood pressure, and urine color do not directly track the correction rate of sodium.
- A 50-year-old man with hyponatremia is found to have a glucose of 800 mg/dL. After accounting for the glucose, his corrected sodium is normal. What is this called?
- Hypertonic (translocational) hyponatremia from hyperglycemia
- True hypotonic hyponatremia
- Pseudohyponatremia from lipids
- SIADH
Correct answer: Hypertonic (translocational) hyponatremia from hyperglycemia
Hypertonic (translocational) hyponatremia from hyperglycemia is correct because high glucose draws water into the vasculature, diluting sodium while raising osmolality, and the corrected sodium reveals no true deficit. This is not hypotonic hyponatremia, lipid-related pseudohyponatremia, or SIADH.
- A 68-year-old woman with hyponatremia has a high urine sodium and is euvolemic, raising suspicion for SIADH. Before diagnosing SIADH, which conditions must be excluded?
- Iron deficiency and anemia
- Hypothyroidism and adrenal insufficiency
- Asthma and allergic rhinitis
- Osteoporosis and gout
Correct answer: Hypothyroidism and adrenal insufficiency
Hypothyroidism and adrenal insufficiency is correct because both can mimic SIADH by impairing water excretion and must be ruled out before the diagnosis is made. Iron deficiency, respiratory allergies, and bone or joint diseases are unrelated to the diagnostic exclusion for SIADH.
- A 60-year-old man develops acute severe hyponatremia over 24 hours with headache, vomiting, and lethargy. Compared with chronic hyponatremia, why can acute hyponatremia be corrected somewhat more readily?
- Acute hyponatremia never causes symptoms
- Chronic hyponatremia is always more dangerous to correct slowly
- The brain has not yet fully adapted, so cerebral edema is the main risk and prompt treatment relieves symptoms
- Acute and chronic hyponatremia are treated identically in all respects
Correct answer: The brain has not yet fully adapted, so cerebral edema is the main risk and prompt treatment relieves symptoms
The brain has not yet fully adapted, so cerebral edema is the main risk and prompt treatment relieves symptoms is correct because in acute hyponatremia, cerebral edema rather than demyelination is the dominant concern, so symptomatic patients are treated promptly. Acute hyponatremia can be symptomatic, and the two situations differ in correction approach.
- A 57-year-old woman with hyponatremia is found to have it caused by a thiazide diuretic. What is the appropriate management step regarding the medication?
- Increase the thiazide dose
- Add a second thiazide
- Continue the thiazide unchanged indefinitely
- Discontinue the thiazide and correct volume and sodium appropriately
Correct answer: Discontinue the thiazide and correct volume and sodium appropriately
Discontinue the thiazide and correct volume and sodium appropriately is correct because thiazide-induced hyponatremia resolves by stopping the offending drug and restoring sodium and volume. Increasing, adding, or continuing the thiazide would perpetuate or worsen the hyponatremia.
- A 60-year-old man presents with hematemesis and melena. He is tachycardic with a blood pressure of 96/60. What is the most appropriate first priority in his management?
- Establish large-bore intravenous access and begin fluid resuscitation
- Perform immediate endoscopy before any resuscitation
- Give an oral proton pump inhibitor and discharge
- Order a barium study
Correct answer: Establish large-bore intravenous access and begin fluid resuscitation
Establish large-bore intravenous access and begin fluid resuscitation is correct because hemodynamic stabilization with intravenous access and fluids precedes endoscopy in upper gastrointestinal bleeding. Endoscopy follows resuscitation, discharge is unsafe, and a barium study would obscure endoscopic visualization.
- A 55-year-old man with an upper gastrointestinal bleed is being resuscitated. After fluids, his hemoglobin is 6.8 g/dL and he continues to bleed. What is the recommended transfusion approach?
- Aggressive transfusion to a hemoglobin above 12 g/dL
- A restrictive transfusion strategy, typically targeting a hemoglobin around 7 g/dL
- No transfusion regardless of hemoglobin
- Transfusion only of platelets
Correct answer: A restrictive transfusion strategy, typically targeting a hemoglobin around 7 g/dL
A restrictive transfusion strategy, typically targeting a hemoglobin around 7 g/dL is correct because restrictive transfusion improves outcomes in most upper gastrointestinal bleeding compared with liberal transfusion. Aggressive over-transfusion, withholding needed blood, and platelet-only transfusion are not the appropriate strategy here.
- A 58-year-old man with a suspected peptic ulcer bleed is hemodynamically stabilized. Which pharmacologic therapy should be started before endoscopy?
- An oral nonsteroidal anti-inflammatory drug
- A vasopressor infusion
- An intravenous proton pump inhibitor
- Therapeutic anticoagulation
Correct answer: An intravenous proton pump inhibitor
An intravenous proton pump inhibitor is correct because acid suppression with an intravenous proton pump inhibitor stabilizes clots and reduces rebleeding in suspected peptic ulcer bleeding before endoscopy. NSAIDs worsen bleeding, vasopressors do not treat the source, and anticoagulation would worsen hemorrhage.
- A 62-year-old man with known cirrhosis presents with a large-volume hematemesis suspected to be from esophageal varices. In addition to resuscitation and proton pump inhibitor, which medication reduces portal pressure and bleeding?
- Intravenous epinephrine infusion
- A calcium channel blocker
- A loop diuretic
- A splanchnic vasoconstrictor such as octreotide
Correct answer: A splanchnic vasoconstrictor such as octreotide
A splanchnic vasoconstrictor such as octreotide is correct because octreotide reduces splanchnic blood flow and portal pressure in variceal bleeding, complementing endoscopic therapy and antibiotics. Systemic epinephrine, calcium channel blockers, and diuretics do not specifically control variceal hemorrhage.
- A 60-year-old man with cirrhosis and a variceal bleed is being treated. Which additional therapy reduces infections and mortality and is recommended in cirrhotic patients with gastrointestinal bleeding?
- Prophylactic antibiotics
- Prophylactic antifungals
- Routine corticosteroids
- Prophylactic anticoagulation
Correct answer: Prophylactic antibiotics
Prophylactic antibiotics is correct because antibiotic prophylaxis reduces bacterial infections and improves survival in cirrhotic patients with gastrointestinal bleeding. Antifungals, corticosteroids, and anticoagulation do not provide this benefit and may be harmful.
- A 57-year-old man with an upper gastrointestinal bleed is risk-stratified. Which validated score uses clinical and laboratory data to identify low-risk patients who may be managed as outpatients?
- The Wells score
- The Glasgow-Blatchford score
- The CHA2DS2-VASc score
- The CURB-65 score
Correct answer: The Glasgow-Blatchford score
The Glasgow-Blatchford score is correct because it stratifies upper gastrointestinal bleeding risk and identifies very-low-risk patients suitable for outpatient management. The Wells score assesses pulmonary embolism, CHA2DS2-VASc estimates stroke risk, and CURB-65 grades pneumonia severity.
- A 59-year-old man with an upper gastrointestinal bleed undergoes endoscopy revealing an actively bleeding ulcer with a visible vessel. What is the appropriate endoscopic management?
- Diagnostic endoscopy only without intervention
- Immediate surgery without endoscopic attempt
- Endoscopic hemostasis with combination therapy such as injection plus thermal or clip
- Discharge with oral antacids
Correct answer: Endoscopic hemostasis with combination therapy such as injection plus thermal or clip
Endoscopic hemostasis with combination therapy such as injection plus thermal or clip is correct because high-risk ulcer stigmata like active bleeding or a visible vessel warrant endoscopic hemostasis to control bleeding and prevent rebleeding. Diagnostic-only endoscopy, jumping to surgery, and discharge with antacids are inappropriate for an actively bleeding lesion.
- A 54-year-old man presents with hematemesis after repeated forceful vomiting following alcohol binge, with a tear at the gastroesophageal junction on endoscopy. What is the diagnosis?
- Esophageal variceal rupture
- Boerhaave syndrome with full-thickness perforation
- Gastric adenocarcinoma
- Mallory-Weiss tear
Correct answer: Mallory-Weiss tear
Mallory-Weiss tear is correct because a mucosal tear at the gastroesophageal junction after retching causes self-limited upper gastrointestinal bleeding. Variceal rupture occurs in portal hypertension, Boerhaave syndrome is a full-thickness perforation with mediastinitis, and gastric cancer presents differently.
- A 65-year-old man on chronic nonsteroidal anti-inflammatory therapy presents with a bleeding gastric ulcer. After acute management, which intervention reduces the risk of recurrent ulcer bleeding?
- Discontinue the nonsteroidal anti-inflammatory drug and treat Helicobacter pylori if present
- Increase the nonsteroidal anti-inflammatory dose
- Start aspirin in addition
- Avoid all acid-suppressing therapy
Correct answer: Discontinue the nonsteroidal anti-inflammatory drug and treat Helicobacter pylori if present
Discontinue the nonsteroidal anti-inflammatory drug and treat Helicobacter pylori if present is correct because removing the ulcerogenic drug and eradicating Helicobacter pylori address the major causes of peptic ulcer bleeding and reduce recurrence. Increasing the drug, adding aspirin, and stopping acid suppression all increase rebleeding risk.
- A 60-year-old man with an upper gastrointestinal bleed has the bleeding source localized to the upper tract. Which clinical feature best distinguishes an upper from a lower gastrointestinal source?
- Bright red blood per rectum always indicates an upper source
- Melena and an elevated BUN-to-creatinine ratio suggest an upper source
- Hematemesis indicates a lower source
- Painless bleeding is exclusive to lower sources
Correct answer: Melena and an elevated BUN-to-creatinine ratio suggest an upper source
Melena and an elevated BUN-to-creatinine ratio suggest an upper source is correct because digested blood produces black tarry stools and a rise in BUN relative to creatinine, pointing to an upper source. Bright red rectal bleeding usually suggests a lower source, hematemesis indicates an upper source, and painless bleeding is not exclusive to lower sources.
- A 58-year-old man with a peptic ulcer bleed is found to have an ulcer with a clean base on endoscopy. What does this finding indicate about rebleeding risk and disposition?
- Very high rebleeding risk requiring prolonged intensive care
- Mandatory immediate surgery
- Low rebleeding risk, allowing earlier feeding and discharge planning
- Need for lifelong intravenous proton pump inhibitor
Correct answer: Low rebleeding risk, allowing earlier feeding and discharge planning
Low rebleeding risk, allowing earlier feeding and discharge planning is correct because a clean-based ulcer carries low rebleeding risk, permitting earlier oral intake and discharge. It does not require prolonged intensive care, surgery, or lifelong intravenous acid suppression.
- A 56-year-old man with a massive upper gastrointestinal bleed has ongoing hematemesis and altered mental status, with concern for airway protection. What additional intervention may be needed before endoscopy?
- Immediate oral feeding
- A barium swallow study
- A high-fiber diet
- Endotracheal intubation to protect the airway from aspiration
Correct answer: Endotracheal intubation to protect the airway from aspiration
Endotracheal intubation to protect the airway from aspiration is correct because massive hematemesis with depressed consciousness risks aspiration, so airway protection may be required before endoscopy. Oral feeding, a barium study, and dietary changes are inappropriate in an actively bleeding, unstable patient.
- A 63-year-old man with recurrent ulcer bleeding fails endoscopic therapy with persistent bleeding. What is the next appropriate step?
- Angiographic embolization or surgical intervention
- Repeat the same failed endoscopic attempt indefinitely
- Discharge with antacids
- Begin anticoagulation
Correct answer: Angiographic embolization or surgical intervention
Angiographic embolization or surgical intervention is correct because when endoscopic hemostasis fails, interventional radiology embolization or surgery is needed to control bleeding. Endlessly repeating a failed endoscopy, discharge, and anticoagulation would not control the hemorrhage.
- A 59-year-old man presents with an upper gastrointestinal bleed and is taking a direct oral anticoagulant. Beyond resuscitation, what is an appropriate consideration regarding his anticoagulation?
- Continue full-dose anticoagulation during active bleeding
- Hold the anticoagulant and consider a reversal agent if bleeding is severe
- Increase the anticoagulant dose
- Add a second anticoagulant
Correct answer: Hold the anticoagulant and consider a reversal agent if bleeding is severe
Hold the anticoagulant and consider a reversal agent if bleeding is severe is correct because anticoagulation should be paused and reversed if bleeding is life-threatening to achieve hemostasis. Continuing, increasing, or adding anticoagulants would worsen the hemorrhage.
- A 61-year-old man with cirrhosis recovers from a variceal bleed. Which therapy is used for secondary prophylaxis to reduce the risk of recurrent variceal bleeding?
- A proton pump inhibitor alone
- A calcium channel blocker
- A nonselective beta-blocker and endoscopic variceal band ligation
- Routine anticoagulation
Correct answer: A nonselective beta-blocker and endoscopic variceal band ligation
A nonselective beta-blocker and endoscopic variceal band ligation is correct because combining a nonselective beta-blocker to lower portal pressure with serial band ligation reduces rebleeding from varices. A proton pump inhibitor alone, calcium channel blockers, and anticoagulation do not provide effective secondary variceal prophylaxis.
- A 57-year-old man presents with melena and is hemodynamically stable. After resuscitation, when is the recommended timing of upper endoscopy for most patients with upper gastrointestinal bleeding?
- Only after 1 week of observation
- Immediately before any resuscitation in all cases
- Never, as endoscopy is contraindicated
- Within 24 hours of presentation after appropriate resuscitation
Correct answer: Within 24 hours of presentation after appropriate resuscitation
Within 24 hours of presentation after appropriate resuscitation is correct because early endoscopy within 24 hours, once the patient is resuscitated, allows diagnosis and treatment of the bleeding source. Waiting a week delays therapy, performing it before resuscitation is unsafe, and endoscopy is the cornerstone diagnostic and therapeutic tool.
- A 60-year-old man with a peptic ulcer bleed is tested for Helicobacter pylori. Why is this testing important in the management of bleeding peptic ulcers?
- Eradicating Helicobacter pylori reduces ulcer recurrence and rebleeding
- It determines the transfusion threshold
- It is required before any endoscopy
- It establishes the need for anticoagulation
Correct answer: Eradicating Helicobacter pylori reduces ulcer recurrence and rebleeding
Eradicating Helicobacter pylori reduces ulcer recurrence and rebleeding is correct because the bacterium is a major cause of peptic ulcers, and eradication prevents recurrence. Testing does not set the transfusion threshold, is not a prerequisite for endoscopy, and does not establish a need for anticoagulation.
- A 64-year-old man with an upper gastrointestinal bleed has his initial resuscitation guided by signs of significant blood loss. Which finding indicates a large-volume hemorrhage requiring aggressive resuscitation?
- An isolated mildly elevated blood pressure
- Tachycardia, hypotension, and orthostatic changes
- A normal heart rate with warm extremities
- A single black stool with stable vitals
Correct answer: Tachycardia, hypotension, and orthostatic changes
Tachycardia, hypotension, and orthostatic changes is correct because these hemodynamic signs reflect significant intravascular volume loss requiring aggressive resuscitation. Mildly elevated blood pressure, normal vitals with good perfusion, and a single stool with stable vitals do not indicate large-volume hemorrhage.
- A 58-year-old man with an upper gastrointestinal bleed has coagulopathy with a markedly prolonged INR from warfarin. What is an appropriate step alongside resuscitation?
- Continue warfarin at the same dose
- Give additional warfarin
- Reverse the coagulopathy to help achieve hemostasis
- Withhold all blood products regardless of bleeding
Correct answer: Reverse the coagulopathy to help achieve hemostasis
Reverse the coagulopathy to help achieve hemostasis is correct because correcting a warfarin-induced coagulopathy supports clot formation and hemostasis in active bleeding. Continuing or increasing warfarin and withholding needed products would worsen the bleeding.
- A 62-year-old man with an upper gastrointestinal bleed from a duodenal ulcer is stabilized and treated endoscopically. What is the role of continued proton pump inhibitor therapy after successful endoscopic hemostasis of a high-risk ulcer?
- Proton pump inhibitors should be stopped immediately after endoscopy
- Antacids should replace proton pump inhibitors entirely
- Acid suppression has no benefit after endoscopy
- Continued high-dose proton pump inhibitor therapy reduces rebleeding
Correct answer: Continued high-dose proton pump inhibitor therapy reduces rebleeding
Continued high-dose proton pump inhibitor therapy reduces rebleeding is correct because ongoing acid suppression after endoscopic treatment of a high-risk ulcer stabilizes clots and lowers rebleeding rates. Stopping the proton pump inhibitor, substituting antacids, or denying any benefit are incorrect.
- A 38-year-old woman with untreated Graves disease presents with fever of 40 degrees Celsius, heart rate of 160, agitation, and delirium after a recent infection. What is the most appropriate first medication to control the adrenergic symptoms?
- A beta-blocker such as propranolol
- Radioactive iodine ablation
- Levothyroxine
- An antibiotic alone
Correct answer: A beta-blocker such as propranolol
A beta-blocker such as propranolol is correct because thyroid storm requires immediate control of severe adrenergic symptoms with a beta-blocker as part of a multi-drug regimen. Radioactive iodine is not an acute therapy, levothyroxine would worsen the hyperthyroidism, and an antibiotic alone does not treat the storm.
- A 42-year-old man in thyroid storm is being treated. In what order should the thionamide and iodine be given to avoid worsening the hyperthyroidism?
- Give iodine first, then the thionamide
- Give the thionamide (such as propylthiouracil) first, then iodine at least an hour later
- Give iodine alone without a thionamide
- Give levothyroxine before iodine
Correct answer: Give the thionamide (such as propylthiouracil) first, then iodine at least an hour later
Give the thionamide (such as propylthiouracil) first, then iodine at least an hour later is correct because the thionamide blocks new hormone synthesis before iodine is given, since iodine before synthesis blockade could fuel hormone production. Iodine first or alone risks worsening, and levothyroxine adds hormone.
- A 40-year-old woman with thyroid storm is given propylthiouracil. By what mechanism does propylthiouracil help in this acute setting beyond blocking hormone synthesis?
- It directly destroys thyroid tissue
- It stimulates thyroid-stimulating hormone release
- It inhibits peripheral conversion of thyroxine to the more active triiodothyronine
- It blocks beta-adrenergic receptors
Correct answer: It inhibits peripheral conversion of thyroxine to the more active triiodothyronine
It inhibits peripheral conversion of thyroxine to the more active triiodothyronine is correct because propylthiouracil reduces peripheral conversion of T4 to active T3, an advantage in thyroid storm. It does not destroy thyroid tissue, stimulate thyroid-stimulating hormone, or block beta receptors.
- A 45-year-old woman in thyroid storm receives glucocorticoids as part of treatment. What is the rationale for adding corticosteroids?
- They directly block thyroid hormone synthesis
- They are antibiotics for the precipitating infection
- They lower the heart rate by beta-blockade
- They reduce peripheral conversion of thyroxine to triiodothyronine and treat possible relative adrenal insufficiency
Correct answer: They reduce peripheral conversion of thyroxine to triiodothyronine and treat possible relative adrenal insufficiency
They reduce peripheral conversion of thyroxine to triiodothyronine and treat possible relative adrenal insufficiency is correct because glucocorticoids decrease T4-to-T3 conversion and cover the increased cortisol demand in thyroid storm. They do not block synthesis like thionamides, act as antibiotics, or provide beta-blockade.
- A 36-year-old woman presents with weight loss, heat intolerance, tremor, palpitations, and a diffuse goiter with a bruit, along with exophthalmos. Laboratory testing shows a suppressed thyroid-stimulating hormone and elevated free T4. What is the most likely diagnosis?
- Graves disease
- Hashimoto thyroiditis with hypothyroidism
- Subacute granulomatous thyroiditis
- A toxic adenoma without eye findings
Correct answer: Graves disease
Graves disease is correct because diffuse goiter with a bruit, exophthalmos, and biochemical hyperthyroidism reflect autoimmune thyroid-stimulating antibody-mediated disease. Hashimoto disease causes hypothyroidism, subacute thyroiditis is painful and self-limited, and a toxic adenoma does not cause exophthalmos.
- A 50-year-old woman with hyperthyroidism is found to have a suppressed thyroid-stimulating hormone with elevated thyroid hormones. Which test helps distinguish Graves disease from thyroiditis as the cause of thyrotoxicosis?
- A complete blood count
- A radioactive iodine uptake scan (high uptake in Graves, low in thyroiditis)
- A serum sodium level
- A chest radiograph
Correct answer: A radioactive iodine uptake scan (high uptake in Graves, low in thyroiditis)
A radioactive iodine uptake scan (high uptake in Graves, low in thyroiditis) is correct because the pattern of iodine uptake separates hyperfunctioning Graves disease from the low uptake of thyroiditis or exogenous hormone. A blood count, sodium, and chest radiograph do not distinguish these causes.
- A 39-year-old woman in thyroid storm has a precipitating cause sought. Which factor commonly precipitates thyroid storm in a patient with underlying hyperthyroidism?
- A high-fiber diet
- Mild dehydration alone
- Infection, surgery, trauma, or iodine load
- Routine vaccination
Correct answer: Infection, surgery, trauma, or iodine load
Infection, surgery, trauma, or iodine load is correct because acute stressors such as infection or surgery commonly trigger thyroid storm in susceptible patients, and identifying and treating them is essential. Diet, mild dehydration, and vaccination are not typical precipitants.
- A 44-year-old man in thyroid storm with a heart rate of 170 has a contraindication to nonselective beta-blockers due to severe reactive airway disease. Which agent can be used to control the heart rate?
- Levothyroxine
- A vasodilator alone
- An anticholinergic bronchodilator for rate control
- A cardioselective beta-blocker such as esmolol
Correct answer: A cardioselective beta-blocker such as esmolol
A cardioselective beta-blocker such as esmolol is correct because a short-acting cardioselective beta-blocker can control the tachycardia of thyroid storm with less bronchospasm risk. Levothyroxine worsens the disease, a vasodilator does not control rate, and an anticholinergic bronchodilator is not a rate-control agent.
- A 41-year-old woman recovers from thyroid storm and her hyperthyroidism is controlled. What are the definitive long-term treatment options for the underlying Graves disease?
- Radioactive iodine ablation, antithyroid drugs, or thyroidectomy
- Lifelong beta-blockers alone
- Levothyroxine replacement only
- No further treatment
Correct answer: Radioactive iodine ablation, antithyroid drugs, or thyroidectomy
Radioactive iodine ablation, antithyroid drugs, or thyroidectomy is correct because these are the definitive options to control Graves hyperthyroidism after acute stabilization. Beta-blockers only manage symptoms, levothyroxine treats hypothyroidism, and leaving it untreated risks recurrence.
- A 55-year-old woman presents with thyrotoxicosis, a tender thyroid, fever, and a recent viral illness, with low radioactive iodine uptake. What is the most likely diagnosis and the appropriate symptomatic treatment?
- Graves disease requiring radioactive iodine
- Subacute (de Quervain) thyroiditis, treated with beta-blockers and anti-inflammatory therapy
- Toxic multinodular goiter requiring surgery
- Factitious thyrotoxicosis
Correct answer: Subacute (de Quervain) thyroiditis, treated with beta-blockers and anti-inflammatory therapy
Subacute (de Quervain) thyroiditis, treated with beta-blockers and anti-inflammatory therapy is correct because a tender thyroid with post-viral thyrotoxicosis and low uptake indicates self-limited subacute thyroiditis managed symptomatically. Graves disease and toxic goiter show high uptake, and factitious thyrotoxicosis lacks a tender gland.
- A 60-year-old man with thyrotoxicosis develops new-onset atrial fibrillation. How should the thyrotoxicosis influence his management?
- The hyperthyroidism is unrelated to the atrial fibrillation
- Thyroid hormone should be increased
- Treating the hyperthyroidism is essential because it is a reversible cause of the atrial fibrillation
- Only anticoagulation is needed with no thyroid treatment
Correct answer: Treating the hyperthyroidism is essential because it is a reversible cause of the atrial fibrillation
Treating the hyperthyroidism is essential because it is a reversible cause of the atrial fibrillation is correct because thyrotoxicosis precipitates atrial fibrillation, and controlling the thyroid hormone is key to managing the rhythm. The conditions are linked, increasing thyroid hormone is harmful, and thyroid treatment is needed alongside rate and anticoagulation decisions.
- A 37-year-old woman in thyroid storm is treated with multiple agents. Which set of medications represents the comprehensive pharmacologic approach to thyroid storm?
- Levothyroxine and iodine
- An antibiotic and a diuretic alone
- A vasopressor and insulin
- A beta-blocker, a thionamide, iodine after the thionamide, and glucocorticoids
Correct answer: A beta-blocker, a thionamide, iodine after the thionamide, and glucocorticoids
A beta-blocker, a thionamide, iodine after the thionamide, and glucocorticoids is correct because this combination controls adrenergic symptoms, blocks hormone synthesis and release, and reduces peripheral conversion in thyroid storm. The other combinations omit essential components or include harmful agents like thyroid hormone.
- A 48-year-old woman with hyperthyroidism is found to have a single hyperfunctioning nodule with suppressed uptake in the surrounding gland on scan. What is this entity called?
- Toxic adenoma
- Graves disease
- Hashimoto thyroiditis
- Subacute thyroiditis
Correct answer: Toxic adenoma
Toxic adenoma is correct because a solitary autonomously functioning nodule with suppression of the rest of the gland on scan defines a toxic adenoma. Graves disease shows diffuse uptake, Hashimoto disease causes hypothyroidism, and subacute thyroiditis has low uptake.
- A 43-year-old woman in thyroid storm is severely hyperthermic. What is the appropriate management of her hyperthermia?
- Aspirin as the antipyretic of choice
- Active cooling and acetaminophen, avoiding aspirin
- Warming blankets
- No temperature management
Correct answer: Active cooling and acetaminophen, avoiding aspirin
Active cooling and acetaminophen, avoiding aspirin is correct because cooling measures and acetaminophen lower temperature, while aspirin is avoided because it displaces thyroid hormone from binding proteins and can worsen thyrotoxicosis. Warming and no management are clearly inappropriate.
- A 52-year-old woman is found to have a thyroid-stimulating hormone level that is low with normal free T4 and T3 and no symptoms. What does this represent?
- Overt thyroid storm
- Primary hypothyroidism
- Subclinical hyperthyroidism
- Euthyroid sick syndrome with high T4
Correct answer: Subclinical hyperthyroidism
Subclinical hyperthyroidism is correct because a suppressed thyroid-stimulating hormone with normal thyroid hormone levels and no symptoms defines subclinical hyperthyroidism, which may warrant monitoring or treatment depending on risk. It is not overt storm, hypothyroidism, or euthyroid sick syndrome.
- A 39-year-old pregnant woman in the first trimester has hyperthyroidism requiring an antithyroid drug. Which thionamide is generally preferred in the first trimester?
- Methimazole in the first trimester due to its safety
- Radioactive iodine
- Levothyroxine
- Propylthiouracil
Correct answer: Propylthiouracil
Propylthiouracil is correct because it is preferred in the first trimester of pregnancy because methimazole carries a higher teratogenic risk early in gestation. Radioactive iodine is contraindicated in pregnancy, and levothyroxine treats hypothyroidism, not hyperthyroidism.
- A 46-year-old man in thyroid storm has multiorgan involvement assessed with a scoring system that incorporates temperature, central nervous system effects, cardiovascular dysfunction, and gastrointestinal-hepatic dysfunction. What is the purpose of such a scoring tool?
- To help diagnose thyroid storm and assess its severity
- To determine the radioactive iodine dose
- To select the antibiotic
- To measure renal function
Correct answer: To help diagnose thyroid storm and assess its severity
To help diagnose thyroid storm and assess its severity is correct because clinical scoring systems integrate the systemic features to support the diagnosis and gauge severity of thyroid storm, since it is a clinical diagnosis. It does not set the iodine dose, choose antibiotics, or measure renal function.
- A 41-year-old woman with severe thyrotoxicosis develops high-output heart failure during thyroid storm. What is the central principle of managing this cardiac complication?
- Increase thyroid hormone to improve contractility
- Control the hyperthyroid state and the adrenergic surge while supporting the heart
- Withhold all beta-blockade
- Administer levothyroxine
Correct answer: Control the hyperthyroid state and the adrenergic surge while supporting the heart
Control the hyperthyroid state and the adrenergic surge while supporting the heart is correct because reducing thyroid hormone effect and adrenergic drive, with careful cardiac support, addresses thyrotoxic high-output failure. Increasing thyroid hormone, withholding indicated beta-blockade, and giving levothyroxine would worsen the condition.
- A 50-year-old woman with an elderly presentation of hyperthyroidism has predominantly cardiac symptoms and apathy rather than classic hyperadrenergic features. What is this presentation called?
- Subclinical hypothyroidism
- Euthyroid state
- Apathetic hyperthyroidism
- Myxedema coma
Correct answer: Apathetic hyperthyroidism
Apathetic hyperthyroidism is correct because older patients may present with weight loss, atrial fibrillation, and apathy rather than the typical hyperactive picture, which can delay diagnosis. This is not hypothyroidism, a euthyroid state, or myxedema coma (which is severe hypothyroidism).
- A 38-year-old woman with thyroid storm is being treated and her precipitating infection is identified. Besides the thyroid-directed therapy, what additional management is essential?
- Stop all fluids and antipyretics
- Avoid treating the underlying trigger
- Begin thyroid hormone replacement
- Identify and treat the precipitating cause and provide supportive care
Correct answer: Identify and treat the precipitating cause and provide supportive care
Identify and treat the precipitating cause and provide supportive care is correct because treating the trigger such as infection and providing supportive measures are integral to resolving thyroid storm. Stopping supportive care, ignoring the trigger, and giving thyroid hormone are all inappropriate.
- A 45-year-old woman with known primary adrenal insufficiency presents after a vomiting illness with hypotension refractory to fluids, hyponatremia, hyperkalemia, and lethargy. What is the most appropriate immediate treatment?
- Intravenous hydrocortisone and aggressive fluid resuscitation
- An intravenous beta-blocker
- Levothyroxine
- Immediate dialysis
Correct answer: Intravenous hydrocortisone and aggressive fluid resuscitation
Intravenous hydrocortisone and aggressive fluid resuscitation is correct because adrenal crisis is a life-threatening emergency treated with immediate stress-dose glucocorticoids and fluids. A beta-blocker would worsen hypotension, levothyroxine does not treat cortisol deficiency, and dialysis is not the primary therapy.
- A 50-year-old man is suspected of having adrenal insufficiency. Which test is used to confirm the diagnosis by assessing the cortisol response to stimulation?
- A glucose tolerance test
- A cosyntropin (ACTH) stimulation test
- A dexamethasone suppression test as the primary confirmatory test
- A water deprivation test
Correct answer: A cosyntropin (ACTH) stimulation test
A cosyntropin (ACTH) stimulation test is correct because an inadequate cortisol rise after synthetic ACTH confirms adrenal insufficiency. A glucose tolerance test assesses diabetes, the dexamethasone suppression test evaluates cortisol excess, and a water deprivation test evaluates diabetes insipidus.
- A 42-year-old woman presents with fatigue, weight loss, salt craving, hypotension, and hyperpigmentation of the skin and oral mucosa. Laboratory testing shows hyponatremia and hyperkalemia. What is the most likely diagnosis?
- Secondary adrenal insufficiency from pituitary disease
- Cushing syndrome
- Primary adrenal insufficiency (Addison disease)
- Hyperaldosteronism
Correct answer: Primary adrenal insufficiency (Addison disease)
Primary adrenal insufficiency (Addison disease) is correct because hyperpigmentation from elevated ACTH along with hyponatremia, hyperkalemia, and salt craving reflects combined glucocorticoid and mineralocorticoid deficiency at the adrenal level. Secondary insufficiency lacks hyperpigmentation and hyperkalemia, while Cushing syndrome and hyperaldosteronism involve hormone excess.
- A 55-year-old man on chronic high-dose prednisone for an autoimmune disease abruptly stops the medication and develops weakness, hypotension, and hypoglycemia. What is the cause of his presentation?
- Primary adrenal autoimmune destruction
- Pheochromocytoma
- Hyperthyroidism
- Secondary adrenal insufficiency from suppression of the hypothalamic-pituitary-adrenal axis
Correct answer: Secondary adrenal insufficiency from suppression of the hypothalamic-pituitary-adrenal axis
Secondary adrenal insufficiency from suppression of the hypothalamic-pituitary-adrenal axis is correct because abruptly stopping chronic exogenous steroids leaves a suppressed axis unable to produce cortisol, precipitating insufficiency. This is not primary autoimmune destruction, a catecholamine tumor, or hyperthyroidism.
- A 48-year-old woman with adrenal insufficiency is scheduled for major surgery. What is the appropriate perioperative management of her glucocorticoid therapy?
- Administer stress-dose glucocorticoids to cover the increased physiologic demand
- Stop all glucocorticoids before surgery
- Continue only the usual maintenance dose
- Give mineralocorticoids alone
Correct answer: Administer stress-dose glucocorticoids to cover the increased physiologic demand
Administer stress-dose glucocorticoids to cover the increased physiologic demand is correct because major stress such as surgery requires increased glucocorticoid dosing to prevent adrenal crisis in patients who cannot mount a normal cortisol response. Stopping steroids, using only the maintenance dose, or giving mineralocorticoids alone risk crisis.
- A 40-year-old man with primary adrenal insufficiency requires long-term replacement therapy. Which combination of hormones is typically needed in primary adrenal insufficiency?
- A glucocorticoid alone
- A glucocorticoid and a mineralocorticoid
- Thyroid hormone and insulin
- A mineralocorticoid alone
Correct answer: A glucocorticoid and a mineralocorticoid
A glucocorticoid and a mineralocorticoid is correct because primary adrenal failure impairs both cortisol and aldosterone, requiring replacement of both, typically hydrocortisone and fludrocortisone. Glucocorticoid alone is insufficient in primary disease, and thyroid hormone, insulin, or mineralocorticoid alone do not replace the deficient hormones appropriately.
- A 52-year-old woman with secondary adrenal insufficiency from a pituitary tumor is treated. Why does she typically not require mineralocorticoid replacement, unlike a patient with primary adrenal insufficiency?
- She produces excess aldosterone
- Mineralocorticoids are never needed in any adrenal insufficiency
- Aldosterone secretion is preserved because it is regulated mainly by the renin-angiotensin system rather than ACTH
- Her kidneys produce cortisol
Correct answer: Aldosterone secretion is preserved because it is regulated mainly by the renin-angiotensin system rather than ACTH
Aldosterone secretion is preserved because it is regulated mainly by the renin-angiotensin system rather than ACTH is correct because secondary insufficiency affects ACTH-dependent cortisol but spares renin-driven aldosterone, so mineralocorticoid replacement is usually unnecessary. She does not overproduce aldosterone, mineralocorticoids are needed in primary disease, and the kidneys do not make cortisol.
- A 47-year-old man in adrenal crisis is started on stress-dose hydrocortisone. Why does high-dose hydrocortisone obviate the immediate need for separate mineralocorticoid in acute crisis?
- Hydrocortisone is a pure mineralocorticoid
- Mineralocorticoids worsen adrenal crisis
- Hydrocortisone blocks aldosterone receptors
- At high doses hydrocortisone has sufficient mineralocorticoid activity
Correct answer: At high doses hydrocortisone has sufficient mineralocorticoid activity
At high doses hydrocortisone has sufficient mineralocorticoid activity is correct because stress-dose hydrocortisone provides enough mineralocorticoid effect acutely, so separate fludrocortisone is not urgently required during crisis. Hydrocortisone is primarily a glucocorticoid, mineralocorticoids do not worsen crisis, and hydrocortisone does not block aldosterone receptors.
- A 38-year-old woman with autoimmune adrenal insufficiency is counseled about sick-day rules. What instruction is essential to prevent adrenal crisis during illness?
- Increase the glucocorticoid dose during illness, fever, or stress
- Stop glucocorticoids when ill
- Decrease the dose during infections
- Take mineralocorticoids only when feeling well
Correct answer: Increase the glucocorticoid dose during illness, fever, or stress
Increase the glucocorticoid dose during illness, fever, or stress is correct because physiologic stress raises cortisol demand, and patients must up-titrate (stress dose) to avoid crisis. Stopping or decreasing the dose during illness precipitates crisis, and selectively timing mineralocorticoids to wellness is incorrect.
- A 60-year-old man presents with suspected adrenal crisis and is critically ill. Should treatment be started before laboratory confirmation?
- No, wait for the cortisol result before any treatment
- Yes, empiric glucocorticoids and fluids should be started immediately when crisis is suspected
- Only after a CT scan of the adrenals
- Only after an ACTH stimulation test is completed
Correct answer: Yes, empiric glucocorticoids and fluids should be started immediately when crisis is suspected
Yes, empiric glucocorticoids and fluids should be started immediately when crisis is suspected is correct because adrenal crisis is life-threatening and treatment must not be delayed for confirmatory testing; dexamethasone can be used if testing will follow. Waiting for results, imaging, or stimulation testing before treating risks death.
- A 44-year-old woman with adrenal insufficiency has hypoglycemia during a crisis. Why does cortisol deficiency predispose to hypoglycemia?
- Cortisol deficiency increases insulin production
- Cortisol normally lowers blood glucose
- Cortisol normally supports gluconeogenesis and counters insulin, so its deficiency lowers glucose
- Cortisol deficiency causes excess glucagon
Correct answer: Cortisol normally supports gluconeogenesis and counters insulin, so its deficiency lowers glucose
Cortisol normally supports gluconeogenesis and counters insulin, so its deficiency lowers glucose is correct because cortisol is a counter-regulatory hormone promoting glucose production, and its absence leads to hypoglycemia. Cortisol does not increase insulin or lower glucose normally, and its deficiency does not cause excess glucagon as the mechanism.
- A 50-year-old man with bilateral adrenal hemorrhage from severe sepsis develops acute adrenal insufficiency. This association of fulminant infection with adrenal hemorrhage is known as which syndrome?
- Sheehan syndrome
- Nelson syndrome
- Conn syndrome
- Waterhouse-Friderichsen syndrome
Correct answer: Waterhouse-Friderichsen syndrome
Waterhouse-Friderichsen syndrome is correct because adrenal hemorrhage during fulminant infection, classically meningococcemia, causes acute adrenal failure. Sheehan syndrome is postpartum pituitary necrosis, Nelson syndrome follows adrenalectomy, and Conn syndrome is primary hyperaldosteronism.
- A 55-year-old woman with adrenal insufficiency is on fludrocortisone. What is the purpose of this mineralocorticoid replacement?
- To replace aldosterone and maintain sodium, potassium, and volume balance
- To replace cortisol
- To suppress ACTH
- To provide thyroid hormone
Correct answer: To replace aldosterone and maintain sodium, potassium, and volume balance
To replace aldosterone and maintain sodium, potassium, and volume balance is correct because fludrocortisone substitutes for aldosterone, supporting sodium retention, potassium excretion, and blood pressure in primary adrenal insufficiency. It does not replace cortisol, suppress ACTH directly, or provide thyroid hormone.
- A 48-year-old man being evaluated for adrenal insufficiency has an elevated ACTH level with a low cortisol. What does this pattern indicate?
- Secondary adrenal insufficiency
- Primary adrenal insufficiency
- Cushing disease
- A normal axis
Correct answer: Primary adrenal insufficiency
Primary adrenal insufficiency is correct because a high ACTH with low cortisol shows the pituitary is appropriately driving an adrenal gland that cannot respond, localizing the defect to the adrenal. Secondary insufficiency has low ACTH, Cushing disease has cortisol excess, and these values are not a normal axis.
- A 41-year-old woman recovering from an adrenal crisis is transitioned to oral therapy. How should the glucocorticoid dose be adjusted as she recovers?
- Continue high stress doses indefinitely
- Stop all glucocorticoids abruptly
- Taper the stress dose down to a maintenance replacement dose as the acute stress resolves
- Switch to thyroid hormone
Correct answer: Taper the stress dose down to a maintenance replacement dose as the acute stress resolves
Taper the stress dose down to a maintenance replacement dose as the acute stress resolves is correct because as the precipitating stress improves, the glucocorticoid is reduced to a physiologic maintenance dose. Indefinite high doses cause adverse effects, abrupt cessation risks recurrence, and thyroid hormone does not replace cortisol.
- A 39-year-old woman with adrenal insufficiency wears a medical alert bracelet and carries an emergency injection. What does the emergency kit typically contain for use during a crisis when she cannot take oral medication?
- Oral aspirin
- Injectable insulin
- An inhaled bronchodilator
- Injectable hydrocortisone for self- or caregiver administration
Correct answer: Injectable hydrocortisone for self- or caregiver administration
Injectable hydrocortisone for self- or caregiver administration is correct because an emergency parenteral glucocorticoid allows rapid treatment of impending crisis when oral intake is impossible. Aspirin, insulin, and a bronchodilator do not treat adrenal crisis.
- A 52-year-old man with adrenal insufficiency presents with vomiting and inability to tolerate oral steroids, with early signs of crisis. What is the appropriate route of glucocorticoid administration?
- Parenteral (intravenous or intramuscular) glucocorticoid
- Continue oral steroids despite vomiting
- Transdermal patch only
- Rectal antipyretics
Correct answer: Parenteral (intravenous or intramuscular) glucocorticoid
Parenteral (intravenous or intramuscular) glucocorticoid is correct because vomiting prevents reliable oral absorption, so parenteral steroids ensure delivery during impending crisis. Continuing oral dosing risks under-treatment, and transdermal or rectal antipyretic routes are inadequate.
- A 46-year-old woman is found to have adrenal insufficiency as part of an autoimmune polyglandular syndrome. Which other endocrine deficiency commonly coexists and should be screened for?
- Acromegaly
- Autoimmune thyroid disease
- Pheochromocytoma
- Primary hyperaldosteronism
Correct answer: Autoimmune thyroid disease
Autoimmune thyroid disease is correct because autoimmune adrenal insufficiency often clusters with autoimmune thyroid disease and other endocrine deficiencies in polyglandular syndromes. Acromegaly, pheochromocytoma, and hyperaldosteronism are hormone-excess disorders not typical of this autoimmune cluster.
- A 50-year-old man in adrenal crisis has severe hyponatremia and hyperkalemia. How does glucocorticoid and fluid therapy help correct these electrolyte abnormalities?
- Glucocorticoids directly raise potassium further
- Fluids worsen the hyponatremia
- Restoring cortisol and volume improves free water excretion and, with mineralocorticoid effect, normalizes sodium and potassium
- Treatment has no effect on electrolytes
Correct answer: Restoring cortisol and volume improves free water excretion and, with mineralocorticoid effect, normalizes sodium and potassium
Restoring cortisol and volume improves free water excretion and, with mineralocorticoid effect, normalizes sodium and potassium is correct because correcting the hormone deficiency and volume status addresses the impaired water handling and mineralocorticoid deficiency driving the electrolyte derangements. Treatment lowers rather than raises potassium, corrects rather than worsens sodium, and clearly affects electrolytes.
- A 43-year-old woman with chronic adrenal insufficiency presents to the emergency department after a motor vehicle collision. Beyond trauma care, what endocrine intervention is critical?
- Withhold steroids until vital signs stabilize
- Give insulin
- Provide mineralocorticoids only
- Administer stress-dose glucocorticoids to prevent crisis from the physiologic stress
Correct answer: Administer stress-dose glucocorticoids to prevent crisis from the physiologic stress
Administer stress-dose glucocorticoids to prevent crisis from the physiologic stress is correct because major trauma is a stressor that can precipitate adrenal crisis in a patient unable to increase cortisol, so stress dosing is essential. Withholding steroids, giving insulin, or providing only mineralocorticoids would not prevent the crisis.
- A 55-year-old woman presents with sudden dyspnea and pleuritic chest pain 5 days after knee surgery. She is tachycardic with a low oxygen saturation and a swollen calf. Her Wells score is high. What is the most appropriate next diagnostic step?
- CT pulmonary angiography
- A D-dimer to rule out the diagnosis
- Reassurance and discharge
- An exercise stress test
Correct answer: CT pulmonary angiography
CT pulmonary angiography is correct because with a high pretest probability for pulmonary embolism, imaging with CT pulmonary angiography is performed directly rather than relying on a D-dimer. A D-dimer is most useful when pretest probability is low, and discharge or stress testing would be unsafe and inappropriate.
- A 30-year-old healthy woman presents with mild pleuritic chest pain and a low pretest probability for pulmonary embolism by the Wells criteria. What is the most appropriate next test?
- Immediate CT pulmonary angiography
- A D-dimer
- Empiric anticoagulation
- A ventilation-perfusion scan as first-line in everyone
Correct answer: A D-dimer
A D-dimer is correct because in patients with low pretest probability, a negative high-sensitivity D-dimer can safely exclude pulmonary embolism without imaging. Proceeding directly to CT, anticoagulating empirically, or defaulting to a ventilation-perfusion scan in all patients is not the appropriate first step at low probability.
- A 60-year-old man with a confirmed pulmonary embolism is hemodynamically stable with a normal blood pressure and no right heart strain. What is the most appropriate treatment?
- Systemic thrombolysis
- Surgical embolectomy
- Therapeutic anticoagulation
- Inferior vena cava filter as first-line
Correct answer: Therapeutic anticoagulation
Therapeutic anticoagulation is correct because hemodynamically stable pulmonary embolism without right heart strain is treated with anticoagulation alone. Thrombolysis and embolectomy are reserved for massive or high-risk embolism, and an inferior vena cava filter is used only when anticoagulation is contraindicated.
- A 58-year-old woman with a pulmonary embolism becomes hypotensive with a blood pressure of 80/50 and signs of shock. What is the most appropriate treatment for this high-risk (massive) pulmonary embolism?
- Anticoagulation alone with observation
- Discharge on oral anticoagulants
- An exercise program
- Systemic thrombolytic therapy
Correct answer: Systemic thrombolytic therapy
Systemic thrombolytic therapy is correct because hemodynamically unstable, massive pulmonary embolism warrants thrombolysis (or embolectomy if lysis is contraindicated) to rapidly restore perfusion. Anticoagulation alone, discharge, or exercise are inadequate for a patient in obstructive shock.
- A 50-year-old man with a suspected pulmonary embolism has a contraindication to CT contrast due to severe contrast allergy and renal impairment. Which alternative imaging test can be used to evaluate for pulmonary embolism?
- A ventilation-perfusion scan
- A coronary angiogram
- An echocardiogram as the definitive diagnostic test
- A barium swallow
Correct answer: A ventilation-perfusion scan
A ventilation-perfusion scan is correct because it avoids iodinated contrast and is a useful alternative for diagnosing pulmonary embolism when CT pulmonary angiography is contraindicated. A coronary angiogram and barium swallow do not assess pulmonary embolism, and echocardiography supports risk stratification rather than serving as the definitive diagnostic test.
- A 62-year-old man presents with dyspnea, and an ECG shows sinus tachycardia, which is the most common ECG finding in pulmonary embolism. Which less common ECG pattern can also occur and reflects right heart strain?
- ST elevation in the inferior leads
- An S1Q3T3 pattern
- A delta wave
- A prolonged PR interval as the classic finding
Correct answer: An S1Q3T3 pattern
An S1Q3T3 pattern is correct because while sinus tachycardia is most common, the S1Q3T3 pattern of right heart strain is a recognized though less frequent finding in pulmonary embolism. Inferior ST elevation suggests infarction, a delta wave indicates pre-excitation, and a prolonged PR interval is not the classic pulmonary embolism finding.
- A 45-year-old woman with a low pretest probability for pulmonary embolism meets all of the PERC (pulmonary embolism rule-out criteria). What does satisfying these criteria allow?
- Immediate anticoagulation is required
- CT pulmonary angiography is mandatory
- Pulmonary embolism can be excluded without further testing in low-risk patients
- Thrombolysis should be given
Correct answer: Pulmonary embolism can be excluded without further testing in low-risk patients
Pulmonary embolism can be excluded without further testing in low-risk patients is correct because in a low-probability patient who meets all PERC criteria, the likelihood is low enough to forgo even a D-dimer. Anticoagulation, mandatory CT, and thrombolysis are not warranted when embolism has been effectively ruled out.
- A 70-year-old man with a pulmonary embolism has anticoagulation absolutely contraindicated due to active major bleeding. What intervention can reduce the risk of further embolism?
- Systemic thrombolysis
- Full-dose anticoagulation despite bleeding
- An exercise program
- Placement of an inferior vena cava filter
Correct answer: Placement of an inferior vena cava filter
Placement of an inferior vena cava filter is correct because when anticoagulation cannot be used because of active bleeding, an inferior vena cava filter prevents lower-extremity clots from reaching the lungs. Thrombolysis and full-dose anticoagulation would worsen bleeding, and exercise does not prevent embolism.
- A 52-year-old woman is diagnosed with an unprovoked pulmonary embolism. What is the general recommended minimum duration of anticoagulation for a first unprovoked venous thromboembolism?
- At least 3 months, with extended therapy considered based on bleeding risk
- 1 week
- 24 hours
- No anticoagulation is needed
Correct answer: At least 3 months, with extended therapy considered based on bleeding risk
At least 3 months, with extended therapy considered based on bleeding risk is correct because a first venous thromboembolism is treated for a minimum of 3 months, and unprovoked events often warrant extended anticoagulation weighing recurrence against bleeding. One week, 24 hours, and no anticoagulation are all inadequate.
- A 48-year-old man with a provoked pulmonary embolism following a long-bone fracture and immobilization is treated. How does the provoked nature of the embolism influence anticoagulation duration?
- It requires lifelong anticoagulation in all cases
- A transient major provoking factor often allows a defined limited course such as 3 months
- It requires no anticoagulation
- It requires only 1 week of treatment
Correct answer: A transient major provoking factor often allows a defined limited course such as 3 months
A transient major provoking factor often allows a defined limited course such as 3 months is correct because when a clear reversible provoking factor is present, a finite anticoagulation course is generally sufficient because the recurrence risk falls after the factor resolves. Lifelong therapy is not mandatory, and no treatment or only 1 week is inadequate.
- A 55-year-old man with a confirmed pulmonary embolism that is submassive has right ventricular strain on echocardiography and elevated troponin but a normal blood pressure. How should this intermediate-risk patient be managed?
- Routine thrombolysis for all such patients
- Discharge home immediately
- Anticoagulation with close monitoring, reserving thrombolysis for deterioration
- No anticoagulation
Correct answer: Anticoagulation with close monitoring, reserving thrombolysis for deterioration
Anticoagulation with close monitoring, reserving thrombolysis for deterioration is correct because intermediate-risk pulmonary embolism with right heart strain but stable hemodynamics is treated with anticoagulation and monitoring, escalating to thrombolysis only if the patient decompensates. Routine thrombolysis, immediate discharge, and withholding anticoagulation are not appropriate.
- A 40-year-old woman with a pulmonary embolism is started on anticoagulation. Which oral agent class is commonly used as monotherapy without the need for initial parenteral bridging for many patients?
- Warfarin without any bridging
- Aspirin
- A statin
- A direct oral anticoagulant such as apixaban or rivaroxaban
Correct answer: A direct oral anticoagulant such as apixaban or rivaroxaban
A direct oral anticoagulant such as apixaban or rivaroxaban is correct because certain direct oral anticoagulants can be started as monotherapy for venous thromboembolism without initial heparin bridging. Warfarin requires parenteral overlap, aspirin is inadequate for acute pulmonary embolism, and a statin is not an anticoagulant.
- A 60-year-old woman presents with suspected pulmonary embolism, and a high-sensitivity D-dimer is markedly elevated, but she has a high pretest probability. How should the elevated D-dimer be interpreted in this context?
- A D-dimer is most useful to exclude pulmonary embolism in low-probability patients and should not replace imaging here
- An elevated D-dimer confirms pulmonary embolism
- It rules out pulmonary embolism
- It indicates the need for thrombolysis
Correct answer: A D-dimer is most useful to exclude pulmonary embolism in low-probability patients and should not replace imaging here
A D-dimer is most useful to exclude pulmonary embolism in low-probability patients and should not replace imaging here is correct because D-dimer has high sensitivity but low specificity, so it excludes disease at low probability but does not confirm it, and imaging is still required at high probability. An elevated D-dimer neither confirms nor rules out embolism and does not by itself indicate thrombolysis.
- A 50-year-old man with a pulmonary embolism is found to have a deep vein thrombosis in the leg. What is the relationship between deep vein thrombosis and pulmonary embolism?
- Pulmonary emboli rarely come from leg veins
- Most pulmonary emboli arise from deep vein thromboses, usually in the lower extremities
- Deep vein thrombosis and pulmonary embolism are unrelated
- Pulmonary emboli originate mainly from arterial clots
Correct answer: Most pulmonary emboli arise from deep vein thromboses, usually in the lower extremities
Most pulmonary emboli arise from deep vein thromboses, usually in the lower extremities is correct because clots typically form in the deep leg veins and embolize to the pulmonary circulation, linking the two as venous thromboembolism. They are not unrelated, leg veins are the major source, and the emboli are venous rather than arterial.
- A 35-year-old woman with recurrent unprovoked venous thromboembolism is evaluated for an underlying cause. What workup is appropriate after recurrent unprovoked clots?
- No further workup
- Only a chest radiograph
- Evaluation for thrombophilia and consideration of underlying malignancy
- A glucose tolerance test
Correct answer: Evaluation for thrombophilia and consideration of underlying malignancy
Evaluation for thrombophilia and consideration of underlying malignancy is correct because recurrent unprovoked thromboembolism prompts assessment for inherited or acquired hypercoagulable states and occult cancer. No workup, an isolated chest radiograph, or a glucose tolerance test would not identify the underlying cause.
- A 58-year-old woman with a pulmonary embolism is stabilized on anticoagulation. Which clinical decision tool helps identify low-risk patients who may be eligible for outpatient treatment?
- The CHA2DS2-VASc score
- The Glasgow-Blatchford score
- The MELD score
- The Pulmonary Embolism Severity Index
Correct answer: The Pulmonary Embolism Severity Index
The Pulmonary Embolism Severity Index is correct because it risk-stratifies pulmonary embolism mortality and identifies low-risk patients who may be managed as outpatients. CHA2DS2-VASc estimates stroke risk in atrial fibrillation, the Glasgow-Blatchford score grades gastrointestinal bleeding, and the MELD score assesses liver disease.
- A 62-year-old man develops a massive pulmonary embolism with cardiac arrest. Which physiologic mechanism explains the hemodynamic collapse?
- Acute right ventricular failure from a sudden increase in pulmonary vascular resistance
- Left ventricular outflow obstruction
- Coronary artery spasm
- Aortic valve stenosis
Correct answer: Acute right ventricular failure from a sudden increase in pulmonary vascular resistance
Acute right ventricular failure from a sudden increase in pulmonary vascular resistance is correct because a large embolus abruptly raises right ventricular afterload, causing right heart failure, reduced left-sided filling, and obstructive shock. Left outflow obstruction, coronary spasm, and aortic stenosis do not explain the acute right heart strain of massive embolism.
- A 47-year-old pregnant woman presents with suspected pulmonary embolism. Which initial test is often used because it avoids radiation to the chest and can confirm venous thromboembolism if positive?
- Immediate CT pulmonary angiography in all cases first
- Compression ultrasonography of the legs
- A barium study
- An echocardiogram alone for diagnosis
Correct answer: Compression ultrasonography of the legs
Compression ultrasonography of the legs is correct because a positive leg ultrasound confirming deep vein thrombosis can establish venous thromboembolism and justify treatment while limiting chest radiation in pregnancy. CT is used when needed but ultrasound is a reasonable first step, and a barium study or echocardiography alone do not diagnose pulmonary embolism.
- A 54-year-old man with a pulmonary embolism is started on a heparin product. Why is anticoagulation initiated promptly even before some confirmatory results in high-probability cases?
- Anticoagulation dissolves the existing clot immediately
- It is given to lower blood pressure
- Early anticoagulation prevents clot propagation and recurrent embolism when suspicion is high
- It replaces the need for any imaging
Correct answer: Early anticoagulation prevents clot propagation and recurrent embolism when suspicion is high
Early anticoagulation prevents clot propagation and recurrent embolism when suspicion is high is correct because starting anticoagulation in high-probability cases prevents further clot growth and embolization while confirmation is pursued. Anticoagulation does not immediately dissolve clot, is not for blood pressure, and does not replace diagnostic imaging.
- A 59-year-old woman is found to have a subsegmental pulmonary embolism incidentally, is asymptomatic, and has no deep vein thrombosis. What is an appropriate consideration in management?
- Always give thrombolysis
- Always place an inferior vena cava filter
- Perform surgical embolectomy
- Individualize the decision, as selected patients with isolated subsegmental embolism and no thrombosis may be monitored rather than anticoagulated
Correct answer: Individualize the decision, as selected patients with isolated subsegmental embolism and no thrombosis may be monitored rather than anticoagulated
Individualize the decision, as selected patients with isolated subsegmental embolism and no thrombosis may be monitored rather than anticoagulated is correct because isolated subsegmental embolism without proximal thrombosis in low-risk patients may be managed with surveillance, weighing bleeding risk. Thrombolysis, a filter, and embolectomy are not indicated for an asymptomatic small subsegmental clot.
- A 50-year-old man with a pulmonary embolism is being risk-stratified with biomarkers and imaging. Which findings indicate higher risk and a worse prognosis?
- Right ventricular dysfunction on echocardiography and elevated troponin or natriuretic peptide
- A normal echocardiogram and normal troponin
- A low D-dimer
- Absence of any symptoms
Correct answer: Right ventricular dysfunction on echocardiography and elevated troponin or natriuretic peptide
Right ventricular dysfunction on echocardiography and elevated troponin or natriuretic peptide is correct because right heart strain and positive cardiac biomarkers mark intermediate- to high-risk pulmonary embolism with worse outcomes. A normal echocardiogram and troponin, a low D-dimer, and absence of symptoms indicate lower rather than higher risk.
- A 65-year-old man presents with acute onset of right-sided weakness and aphasia that began 90 minutes ago. A noncontrast head CT shows no hemorrhage, and his glucose and blood pressure are acceptable. What is the most appropriate next step?
- Start oral aspirin and observe for 24 hours
- Administer intravenous thrombolysis (tPA)
- Begin therapeutic anticoagulation immediately
- Discharge with outpatient neurology follow-up
Correct answer: Administer intravenous thrombolysis (tPA)
Administer intravenous thrombolysis (tPA) is correct because an acute ischemic stroke within the time window, with hemorrhage excluded and no contraindications, is treated with intravenous thrombolysis to restore perfusion. Aspirin is given after lytic eligibility is excluded or after tPA, immediate anticoagulation is not indicated acutely, and discharge would be dangerous.
- A 70-year-old woman presents with acute ischemic stroke symptoms that started 5 hours ago, beyond the standard intravenous thrombolysis window. CT angiography shows a large vessel occlusion in the middle cerebral artery. What treatment may still benefit her?
- Intravenous thrombolysis at the standard dose regardless of time
- Immediate carotid endarterectomy
- Mechanical thrombectomy
- Observation alone
Correct answer: Mechanical thrombectomy
Mechanical thrombectomy is correct because endovascular thrombectomy benefits selected patients with large vessel occlusion even beyond the intravenous thrombolysis window when imaging shows salvageable tissue. Standard intravenous thrombolysis is time-limited, carotid endarterectomy is not the acute intervention, and observation forgoes effective therapy.
- A 62-year-old man with an acute ischemic stroke is eligible for intravenous thrombolysis, but his blood pressure is 200/120. How should his blood pressure be managed before giving thrombolytics?
- Give thrombolytics regardless of the blood pressure
- Raise the blood pressure further
- Withhold all blood pressure management
- Lower the blood pressure to below the recommended threshold (about 185/110) before treatment
Correct answer: Lower the blood pressure to below the recommended threshold (about 185/110) before treatment
Lower the blood pressure to below the recommended threshold (about 185/110) before treatment is correct because blood pressure must be controlled below roughly 185/110 to reduce hemorrhage risk before intravenous thrombolysis. Giving lytics at very high pressures increases bleeding, raising the pressure is harmful, and ignoring it precludes safe treatment.
- A 68-year-old man has an acute ischemic stroke and is not a candidate for thrombolysis or thrombectomy. What is the appropriate early antithrombotic therapy?
- Aspirin
- Therapeutic-dose heparin infusion
- Warfarin started immediately
- Thrombolysis despite contraindications
Correct answer: Aspirin
Aspirin is correct because antiplatelet therapy with aspirin is started early in acute ischemic stroke when reperfusion therapy is not given (typically after excluding hemorrhage and after any tPA window). Therapeutic heparin and immediate warfarin are not standard early therapy, and thrombolysis is contraindicated here.
- A 60-year-old woman presents with stroke symptoms. The single most important imaging study to obtain immediately is which test, and why?
- MRI of the spine
- Noncontrast head CT to exclude hemorrhage before treatment decisions
- A chest radiograph
- An abdominal ultrasound
Correct answer: Noncontrast head CT to exclude hemorrhage before treatment decisions
Noncontrast head CT to exclude hemorrhage before treatment decisions is correct because rapidly excluding intracranial hemorrhage is essential before giving thrombolytics or antithrombotics in suspected stroke. Spine MRI, chest radiograph, and abdominal ultrasound do not address the acute stroke decision.
- A 72-year-old man develops sudden weakness and is found to have an acute ischemic stroke. Time-sensitive management depends on accurately establishing which piece of history?
- The patient's dietary history
- The family history of cancer
- The time the patient was last known to be well
- The patient's vaccination status
Correct answer: The time the patient was last known to be well
The time the patient was last known to be well is correct because eligibility for thrombolysis and thrombectomy hinges on the time from symptom onset or last known well. Dietary, family cancer, and vaccination histories do not determine acute reperfusion eligibility.
- A 66-year-old man who received intravenous thrombolysis for stroke develops sudden worsening neurologic status, headache, and vomiting an hour later. What complication should be suspected?
- Resolution of the stroke
- A new myocardial infarction as the cause of the headache
- Hypoglycemia
- Intracranial hemorrhage from the thrombolytic
Correct answer: Intracranial hemorrhage from the thrombolytic
Intracranial hemorrhage from the thrombolytic is correct because acute neurologic deterioration after thrombolysis suggests symptomatic intracranial hemorrhage, requiring urgent imaging and reversal measures. Worsening is not resolution, a myocardial infarction does not explain the focal deterioration, and the picture is not typical of hypoglycemia.
- A 58-year-old woman recovering from an ischemic stroke is evaluated for secondary prevention. She has atrial fibrillation. Which therapy is most appropriate to prevent recurrent stroke?
- Long-term oral anticoagulation
- Aspirin alone is preferred over anticoagulation in this setting
- No antithrombotic therapy
- Thrombolysis
Correct answer: Long-term oral anticoagulation
Long-term oral anticoagulation is correct because cardioembolic stroke from atrial fibrillation is best prevented with oral anticoagulation rather than antiplatelet therapy alone. Aspirin alone is inferior for atrial fibrillation, no therapy leaves high risk, and thrombolysis is an acute treatment, not prevention.
- A 64-year-old man has an ischemic stroke and is found to have a 80 percent symptomatic stenosis of the ipsilateral internal carotid artery. Which intervention reduces his risk of recurrent stroke?
- Lifelong bed rest
- Carotid endarterectomy (or stenting in selected patients)
- Thrombolysis
- Inferior vena cava filter
Correct answer: Carotid endarterectomy (or stenting in selected patients)
Carotid endarterectomy (or stenting in selected patients) is correct because revascularization of a high-grade symptomatic carotid stenosis reduces recurrent stroke risk. Bed rest does not treat the stenosis, thrombolysis is an acute therapy, and an inferior vena cava filter addresses venous thromboembolism, not carotid disease.
- A 67-year-old woman with an acute ischemic stroke has her blood glucose checked immediately. Why is checking glucose a critical early step in suspected stroke?
- Glucose determines the thrombolytic dose
- Glucose is unrelated to stroke evaluation
- Hypoglycemia can mimic stroke and must be excluded and corrected
- Glucose replaces the need for head imaging
Correct answer: Hypoglycemia can mimic stroke and must be excluded and corrected
Hypoglycemia can mimic stroke and must be excluded and corrected is correct because hypoglycemia is a common stroke mimic, so checking and correcting glucose is essential before attributing deficits to stroke. Glucose does not set the lytic dose, is relevant to the evaluation, and does not replace head imaging.
- A 60-year-old man with a transient ischemic attack has fully resolved symptoms within an hour. How should this be managed compared with a completed stroke?
- Routine outpatient follow-up in several months
- No evaluation since symptoms resolved
- Immediate thrombolysis despite resolution
- Urgent evaluation and secondary prevention because of high short-term stroke risk
Correct answer: Urgent evaluation and secondary prevention because of high short-term stroke risk
Urgent evaluation and secondary prevention because of high short-term stroke risk is correct because a transient ischemic attack signals high near-term stroke risk and warrants prompt workup and preventive therapy. Delayed follow-up and no evaluation underestimate the risk, and thrombolysis is not given once deficits have resolved.
- A 55-year-old man with an ischemic stroke is started on a statin as part of secondary prevention. What is the rationale for high-intensity statin therapy after ischemic stroke?
- It reduces the risk of recurrent stroke and cardiovascular events
- It dissolves the existing clot
- It lowers blood pressure acutely
- It reverses the neurologic deficit immediately
Correct answer: It reduces the risk of recurrent stroke and cardiovascular events
It reduces the risk of recurrent stroke and cardiovascular events is correct because high-intensity statin therapy lowers recurrent stroke and cardiovascular risk after ischemic stroke. It does not dissolve clot, acutely lower blood pressure, or immediately reverse deficits.
- A 70-year-old woman with a minor ischemic stroke or high-risk transient ischemic attack is treated to reduce early recurrence. Which short-term strategy is used in eligible patients?
- Lifelong dual antiplatelet therapy for all patients
- Short-term dual antiplatelet therapy with aspirin and clopidogrel
- Thrombolysis
- Anticoagulation in all cases
Correct answer: Short-term dual antiplatelet therapy with aspirin and clopidogrel
Short-term dual antiplatelet therapy with aspirin and clopidogrel is correct because brief dual antiplatelet therapy reduces early recurrent stroke after a minor stroke or high-risk transient ischemic attack, then transitions to single therapy. Lifelong dual therapy increases bleeding, and thrombolysis or anticoagulation are not the routine choices in this scenario.
- A 63-year-old man with an acute ischemic stroke not treated with thrombolysis has elevated blood pressure of 180/100. How should his blood pressure generally be managed acutely?
- Aggressively normalize the blood pressure immediately
- Raise the blood pressure further
- Permit moderately elevated blood pressure unless it is very high or other indications exist
- Ignore the blood pressure entirely
Correct answer: Permit moderately elevated blood pressure unless it is very high or other indications exist
Permit moderately elevated blood pressure unless it is very high or other indications exist is correct because permissive hypertension preserves perfusion to the ischemic penumbra in non-thrombolysis patients unless pressures are extreme or there is another indication. Aggressive normalization can extend the infarct, raising it is harmful, and it cannot be entirely ignored.
- A 59-year-old woman presents with acute stroke and is evaluated rapidly using a standardized severity scale to quantify her deficit. Which tool is commonly used?
- The Glasgow-Blatchford score
- The CHA2DS2-VASc score
- The Wells score
- The National Institutes of Health Stroke Scale
Correct answer: The National Institutes of Health Stroke Scale
The National Institutes of Health Stroke Scale is correct because it standardizes assessment of stroke severity to guide treatment and prognosis. The Glasgow-Blatchford score grades gastrointestinal bleeding, CHA2DS2-VASc estimates stroke risk in atrial fibrillation, and the Wells score assesses pulmonary embolism probability.
- A 68-year-old man with an ischemic stroke is evaluated for the mechanism. An embolus from the heart in a patient with atrial fibrillation represents which stroke subtype?
- Cardioembolic stroke
- Lacunar (small-vessel) stroke
- Large-artery atherosclerotic stroke
- Hemorrhagic stroke
Correct answer: Cardioembolic stroke
Cardioembolic stroke is correct because a clot originating in the fibrillating atrium that travels to the brain causes a cardioembolic infarct, best prevented with anticoagulation. Lacunar strokes arise from small-vessel disease, large-artery strokes from atherosclerosis, and hemorrhagic stroke involves bleeding rather than embolism.
- A 66-year-old woman with an acute stroke is managed in a dedicated stroke unit. What is the benefit of stroke unit care?
- It eliminates the need for thrombolysis evaluation
- Organized multidisciplinary care improves survival and functional outcomes
- It is only for hemorrhagic strokes
- It delays rehabilitation
Correct answer: Organized multidisciplinary care improves survival and functional outcomes
Organized multidisciplinary care improves survival and functional outcomes is correct because coordinated stroke unit management reduces mortality and disability through systematic monitoring, early rehabilitation, and complication prevention. It does not eliminate reperfusion evaluation, is not limited to hemorrhagic stroke, and promotes rather than delays rehabilitation.
- A 62-year-old man with an ischemic stroke develops difficulty swallowing. Why is a swallowing assessment important before oral intake after a stroke?
- To determine thrombolytic eligibility
- To measure blood pressure
- To reduce the risk of aspiration pneumonia from dysphagia
- To diagnose the stroke
Correct answer: To reduce the risk of aspiration pneumonia from dysphagia
To reduce the risk of aspiration pneumonia from dysphagia is correct because post-stroke dysphagia increases aspiration risk, so screening before feeding prevents aspiration pneumonia. The assessment does not determine lytic eligibility, measure blood pressure, or diagnose the stroke.
- A 70-year-old woman has an acute ischemic stroke with a large vessel occlusion and presents within 2 hours. She is eligible for both intravenous thrombolysis and thrombectomy. What is the appropriate approach?
- Choose only one and avoid the other in all cases
- Withhold both and observe
- Give anticoagulation instead of reperfusion
- Give intravenous thrombolysis if eligible and proceed to mechanical thrombectomy for the large vessel occlusion
Correct answer: Give intravenous thrombolysis if eligible and proceed to mechanical thrombectomy for the large vessel occlusion
Give intravenous thrombolysis if eligible and proceed to mechanical thrombectomy for the large vessel occlusion is correct because eligible patients with a large vessel occlusion can receive thrombolysis and then thrombectomy to maximize reperfusion. Withholding both, arbitrarily limiting to one, or substituting anticoagulation would forgo effective acute therapy.
- A 60-year-old man recovering from an ischemic stroke is counseled on modifiable risk factors for prevention. Which set of factors should be addressed?
- Hypertension, diabetes, hyperlipidemia, smoking, and atrial fibrillation
- Height and blood type
- Eye color and handedness
- Birth season
Correct answer: Hypertension, diabetes, hyperlipidemia, smoking, and atrial fibrillation
Hypertension, diabetes, hyperlipidemia, smoking, and atrial fibrillation is correct because controlling these modifiable vascular risk factors reduces recurrent stroke. Height, blood type, eye color, handedness, and birth season are not modifiable stroke risk factors.
- A 45-year-old man presents with confusion and an arterial blood gas showing metabolic acidosis with a high anion gap. Which formula correctly calculates the anion gap?
- Sodium plus potassium minus chloride
- Sodium minus the sum of chloride and bicarbonate
- Chloride minus bicarbonate
- Bicarbonate minus sodium
Correct answer: Sodium minus the sum of chloride and bicarbonate
Sodium minus the sum of chloride and bicarbonate is correct because the anion gap is calculated as serum sodium minus the sum of chloride and bicarbonate, estimating unmeasured anions. The other expressions do not represent the standard anion gap calculation.
- A 30-year-old man is brought in after ingesting an unknown substance with an elevated anion gap metabolic acidosis, an elevated osmolar gap, and calcium oxalate crystals in the urine with acute kidney injury. Which ingestion is most likely?
- Aspirin overdose alone
- Simple alcohol intoxication with no acidosis
- Ethylene glycol
- Acetaminophen overdose
Correct answer: Ethylene glycol
Ethylene glycol is correct because an elevated anion and osmolar gap with calcium oxalate crystalluria and renal injury is the classic picture of ethylene glycol poisoning. Aspirin causes a mixed acid-base disorder without oxalate crystals, simple alcohol does not cause this picture, and acetaminophen primarily causes hepatotoxicity.
- A 50-year-old man with diabetes and an anion gap metabolic acidosis has positive serum ketones and a high glucose. Which cause of the high anion gap acidosis is most likely?
- Lactic acidosis from sepsis
- Methanol poisoning
- Uremic acidosis
- Diabetic ketoacidosis
Correct answer: Diabetic ketoacidosis
Diabetic ketoacidosis is correct because ketosis with hyperglycemia in a diabetic patient producing a high anion gap acidosis identifies ketoacidosis as the cause. Lactic acidosis lacks prominent ketones, methanol causes visual symptoms and a high osmolar gap, and uremic acidosis occurs with advanced kidney failure.
- A 55-year-old woman presents with hypotension, sepsis, and a high anion gap metabolic acidosis with a markedly elevated serum lactate. Which category of MUDPILES does this represent?
- Lactic acidosis
- Ketoacidosis
- Salicylate toxicity
- Uremia
Correct answer: Lactic acidosis
Lactic acidosis is correct because tissue hypoperfusion in sepsis generates lactate, producing a high anion gap acidosis. Ketoacidosis involves ketones, salicylate toxicity has a characteristic mixed picture, and uremia results from kidney failure rather than hypoperfusion.
- A 60-year-old man with advanced chronic kidney disease has a high anion gap metabolic acidosis. Which mechanism explains the acidosis in renal failure?
- Loss of bicarbonate in the stool
- Accumulation of unexcreted organic acids and impaired acid excretion
- Excess ketone production
- Ingestion of a toxic alcohol
Correct answer: Accumulation of unexcreted organic acids and impaired acid excretion
Accumulation of unexcreted organic acids and impaired acid excretion is correct because failing kidneys cannot excrete the daily acid load or organic anions, raising the anion gap. Stool bicarbonate loss causes a normal-gap acidosis, and ketones and toxic alcohols are distinct causes not described here.
- A 25-year-old woman presents with tinnitus, tachypnea, fever, and a mixed acid-base disturbance with a high anion gap metabolic acidosis and a respiratory alkalosis. Which ingestion classically causes this combination?
- Ethylene glycol alone
- Methanol alone
- Salicylate (aspirin) toxicity
- Isoniazid
Correct answer: Salicylate (aspirin) toxicity
Salicylate (aspirin) toxicity is correct because aspirin overdose characteristically causes a combined high anion gap metabolic acidosis and respiratory alkalosis with tinnitus. Ethylene glycol and methanol cause high-gap acidosis without the characteristic respiratory alkalosis-plus-tinnitus picture, and isoniazid causes seizures and lactic acidosis.
- A 40-year-old man presents with vision changes described as looking at a snowstorm, along with a high anion gap metabolic acidosis and an elevated osmolar gap. Which toxic alcohol is most likely responsible?
- Ethanol with no acidosis
- Propylene glycol at therapeutic doses
- Mannitol
- Methanol
Correct answer: Methanol
Methanol is correct because methanol poisoning causes visual disturbances from optic nerve toxicity along with a high anion and osmolar gap acidosis. Ethanol does not cause these visual findings with acidosis, propylene glycol toxicity differs, and mannitol is an osmotic agent, not this toxidrome.
- A 35-year-old man ingests a toxic alcohol and presents with a high anion gap metabolic acidosis. Which antidote inhibits alcohol dehydrogenase to prevent formation of toxic metabolites in methanol or ethylene glycol poisoning?
- Fomepizole
- Naloxone
- Flumazenil
- Activated charcoal as the antidote
Correct answer: Fomepizole
Fomepizole is correct because it blocks alcohol dehydrogenase, preventing conversion of methanol or ethylene glycol to their toxic acids. Naloxone reverses opioids, flumazenil reverses benzodiazepines, and activated charcoal is a decontaminant rather than a specific antidote for these alcohols.
- A 50-year-old woman with a high anion gap metabolic acidosis is evaluated. After identifying the high gap, what additional acid-base calculation helps detect a coexisting disorder?
- Calculating the corrected sodium only
- Comparing the change in the anion gap with the change in bicarbonate (the delta-delta)
- Measuring the urine specific gravity
- Determining the serum osmolality alone
Correct answer: Comparing the change in the anion gap with the change in bicarbonate (the delta-delta)
Comparing the change in the anion gap with the change in bicarbonate (the delta-delta) is correct because the delta-delta assessment reveals an additional metabolic disturbance superimposed on the high anion gap acidosis. Corrected sodium, urine specific gravity, and osmolality alone do not perform this acid-base analysis.
- A 28-year-old woman with a seizure disorder presents with refractory seizures and a high anion gap lactic acidosis after a medication overdose. Which agent, when overdosed, causes seizures responsive to pyridoxine and lactic acidosis?
- Methanol
- Ethylene glycol
- Isoniazid
- Aspirin
Correct answer: Isoniazid
Isoniazid is correct because isoniazid toxicity causes pyridoxine-responsive seizures and a lactic acidosis (the 'I' in MUDPILES). Methanol and ethylene glycol cause toxic alcohol pictures, and aspirin causes a mixed disorder rather than pyridoxine-responsive seizures.
- A 60-year-old man presents with a metabolic acidosis, and the anion gap is calculated and found to be normal. Which condition causes a normal anion gap (hyperchloremic) metabolic acidosis rather than a high anion gap?
- Lactic acidosis
- Diabetic ketoacidosis
- Methanol poisoning
- Severe diarrhea with bicarbonate loss
Correct answer: Severe diarrhea with bicarbonate loss
Severe diarrhea with bicarbonate loss is correct because gastrointestinal bicarbonate loss produces a normal anion gap acidosis with compensatory hyperchloremia. Lactic acidosis, ketoacidosis, and methanol poisoning all generate unmeasured anions and a high anion gap.
- A 45-year-old man with a high anion gap metabolic acidosis has an elevated osmolar gap. What does an elevated osmolar gap in this setting suggest?
- Ingestion of a toxic alcohol such as methanol or ethylene glycol
- Diabetic ketoacidosis as the only possibility
- Lactic acidosis from exercise
- Normal physiology
Correct answer: Ingestion of a toxic alcohol such as methanol or ethylene glycol
Ingestion of a toxic alcohol such as methanol or ethylene glycol is correct because unmeasured osmotically active toxic alcohols widen the osmolar gap alongside the anion gap acidosis. Ketoacidosis and exercise-related lactic acidosis do not typically widen the osmolar gap, and an elevated gap is not normal.
- A 55-year-old woman with sepsis and lactic acidosis is treated. What is the most effective way to correct the high anion gap acidosis caused by lactate?
- Administer sodium bicarbonate routinely for all cases
- Treat the underlying cause by restoring perfusion and oxygen delivery
- Give a high-protein meal
- Restrict intravenous fluids
Correct answer: Treat the underlying cause by restoring perfusion and oxygen delivery
Treat the underlying cause by restoring perfusion and oxygen delivery is correct because correcting the hypoperfusion that generates lactate is the definitive treatment of lactic acidosis. Routine bicarbonate does not improve outcomes in most cases, a high-protein meal is irrelevant, and fluid restriction would worsen perfusion.
- A 32-year-old man with a high anion gap metabolic acidosis has the MUDPILES mnemonic applied to organize the differential. What does the mnemonic primarily help clinicians do?
- Calculate the osmolar gap
- Determine respiratory compensation
- Recall the major causes of a high anion gap metabolic acidosis
- Estimate the glomerular filtration rate
Correct answer: Recall the major causes of a high anion gap metabolic acidosis
Recall the major causes of a high anion gap metabolic acidosis is correct because MUDPILES is a mnemonic listing causes such as methanol, uremia, diabetic ketoacidosis, and others to structure the differential. It does not calculate the osmolar gap, assess respiratory compensation, or estimate filtration rate.
- A 48-year-old man with a high anion gap metabolic acidosis has expected respiratory compensation assessed. Which compensatory change is expected in a primary metabolic acidosis?
- A compensatory respiratory acidosis with hypoventilation
- No respiratory change
- An increase in carbon dioxide
- A compensatory respiratory alkalosis with hyperventilation lowering the carbon dioxide
Correct answer: A compensatory respiratory alkalosis with hyperventilation lowering the carbon dioxide
A compensatory respiratory alkalosis with hyperventilation lowering the carbon dioxide is correct because metabolic acidosis stimulates increased ventilation (Kussmaul breathing) to blow off carbon dioxide as appropriate compensation. The other options describe inappropriate or absent compensation.
- A 60-year-old woman with chronic kidney disease and a high anion gap metabolic acidosis that is severe and refractory to medical therapy is evaluated. Which definitive intervention can correct the acidosis when due to advanced renal failure?
- Hemodialysis
- A high-fat diet
- Oral antibiotics
- Inhaled bronchodilators
Correct answer: Hemodialysis
Hemodialysis is correct because dialysis removes accumulated acids and corrects severe uremic metabolic acidosis when conservative measures fail. A high-fat diet, antibiotics, and bronchodilators do not correct the acidosis of renal failure.
- A 40-year-old man with a high anion gap metabolic acidosis from methanol poisoning is treated. Besides fomepizole, which intervention can remove the toxin and correct severe acidosis?
- Forced diuresis with no other therapy
- Hemodialysis
- A beta-blocker
- An antihistamine
Correct answer: Hemodialysis
Hemodialysis is correct because dialysis removes methanol and its toxic metabolites and corrects severe acidosis in significant poisoning. Forced diuresis alone is inadequate, and a beta-blocker or antihistamine do not address the toxin or acidosis.
- A 35-year-old patient presents with an anion gap metabolic acidosis after prolonged starvation with ketosis but normal glucose. Which cause of high anion gap acidosis is this?
- Lactic acidosis from sepsis
- Toxic alcohol ingestion
- Starvation ketoacidosis
- Uremia
Correct answer: Starvation ketoacidosis
Starvation ketoacidosis is correct because prolonged fasting can produce ketone-mediated acidosis with relatively normal glucose, though usually milder than diabetic ketoacidosis. Sepsis-related lactic acidosis, toxic alcohols, and uremia have different precipitants and findings.
- A 50-year-old man on long-term metformin develops shock and a severe high anion gap lactic acidosis. Which factor most likely contributed to his lactic acidosis?
- A high-carbohydrate diet
- Routine exercise
- Vitamin supplementation
- Metformin accumulation in the setting of renal impairment and hypoperfusion
Correct answer: Metformin accumulation in the setting of renal impairment and hypoperfusion
Metformin accumulation in the setting of renal impairment and hypoperfusion is correct because metformin can rarely cause lactic acidosis, especially when renal clearance is reduced or perfusion is compromised. Diet, exercise, and vitamins do not cause this drug-related lactic acidosis.
- A 45-year-old woman with a high anion gap metabolic acidosis has an initial step in evaluation performed. What is the most useful initial laboratory panel to characterize the acidosis and begin the differential?
- A basic metabolic panel to calculate the anion gap and an arterial or venous blood gas
- A complete blood count alone
- Liver function tests only
- A lipid panel
Correct answer: A basic metabolic panel to calculate the anion gap and an arterial or venous blood gas
A basic metabolic panel to calculate the anion gap and an arterial or venous blood gas is correct because electrolytes allow calculation of the anion gap and a blood gas confirms the acid-base disturbance, anchoring the workup. A blood count, liver tests, and a lipid panel do not characterize the acidosis.
- A 68-year-old man on warfarin presents with a life-threatening intracranial hemorrhage and an INR of 3.5. What is the most appropriate reversal therapy?
- Oral vitamin K alone
- Four-factor prothrombin complex concentrate plus intravenous vitamin K
- Fresh frozen plasma alone over many hours
- Protamine sulfate
Correct answer: Four-factor prothrombin complex concentrate plus intravenous vitamin K
Four-factor prothrombin complex concentrate plus intravenous vitamin K is correct because major warfarin-associated bleeding requires rapid factor replacement with prothrombin complex concentrate and intravenous vitamin K for sustained reversal. Oral vitamin K alone is too slow, plasma works slower and requires large volumes, and protamine reverses heparin, not warfarin.
- A 72-year-old woman on warfarin has an INR of 6.5 but no bleeding. What is the most appropriate management?
- Give four-factor prothrombin complex concentrate
- Administer protamine sulfate
- Hold warfarin and consider a low dose of oral vitamin K
- Transfuse packed red blood cells
Correct answer: Hold warfarin and consider a low dose of oral vitamin K
Hold warfarin and consider a low dose of oral vitamin K is correct because a supratherapeutic INR without bleeding is managed by withholding warfarin and giving low-dose oral vitamin K if the INR is markedly elevated. Prothrombin complex concentrate and rapid reversal are reserved for serious bleeding, protamine is for heparin, and transfusion is unnecessary without bleeding or anemia.
- A 60-year-old man taking warfarin needs urgent reversal for emergency surgery. Why is vitamin K given in addition to prothrombin complex concentrate?
- Vitamin K works faster than prothrombin complex concentrate
- Vitamin K reverses heparin
- Vitamin K is an anticoagulant
- Vitamin K provides sustained reversal as the prothrombin complex concentrate effect wanes
Correct answer: Vitamin K provides sustained reversal as the prothrombin complex concentrate effect wanes
Vitamin K provides sustained reversal as the prothrombin complex concentrate effect wanes is correct because prothrombin complex concentrate acts quickly but transiently, so vitamin K maintains synthesis of clotting factors for durable reversal. Vitamin K acts more slowly, does not reverse heparin, and is not itself an anticoagulant.
- A 55-year-old man on therapeutic unfractionated heparin develops major bleeding. Which agent specifically reverses unfractionated heparin?
- Protamine sulfate
- Vitamin K
- Four-factor prothrombin complex concentrate
- Idarucizumab
Correct answer: Protamine sulfate
Protamine sulfate is correct because it binds and neutralizes unfractionated heparin to reverse its anticoagulant effect. Vitamin K reverses warfarin, prothrombin complex concentrate addresses vitamin K-dependent factor deficiency, and idarucizumab reverses a direct thrombin inhibitor.
- A 70-year-old woman on dabigatran, a direct thrombin inhibitor, has life-threatening bleeding. Which specific reversal agent is appropriate?
- Andexanet alfa
- Idarucizumab
- Protamine sulfate
- Vitamin K
Correct answer: Idarucizumab
Idarucizumab is correct because this monoclonal antibody fragment specifically reverses the direct thrombin inhibitor dabigatran. Andexanet alfa reverses factor Xa inhibitors, protamine reverses heparin, and vitamin K reverses warfarin.
- A 65-year-old man on apixaban, a factor Xa inhibitor, presents with major gastrointestinal bleeding. Which agent is a specific reversal agent for factor Xa inhibitors?
- Idarucizumab
- Protamine sulfate
- Andexanet alfa
- Fresh frozen plasma as the specific antidote
Correct answer: Andexanet alfa
Andexanet alfa is correct because it specifically reverses factor Xa inhibitors such as apixaban and rivaroxaban. Idarucizumab reverses dabigatran, protamine reverses heparin, and fresh frozen plasma is not a specific antidote for these agents though prothrombin complex concentrate may be used when the specific agent is unavailable.
- A 58-year-old woman on warfarin with an INR of 9 and no bleeding is managed. Besides holding warfarin, what is the role of vitamin K in this asymptomatic but markedly elevated INR?
- High-dose intravenous vitamin K is mandatory
- Vitamin K should never be given without bleeding
- Protamine should be administered
- Low-dose oral vitamin K can be given to lower the INR while avoiding overcorrection
Correct answer: Low-dose oral vitamin K can be given to lower the INR while avoiding overcorrection
Low-dose oral vitamin K can be given to lower the INR while avoiding overcorrection is correct because a very high INR without bleeding may be treated with low-dose oral vitamin K to reduce bleeding risk without making the patient warfarin-resistant. High-dose intravenous vitamin K risks overcorrection and resistance, vitamin K can be appropriate here, and protamine does not reverse warfarin.
- A 62-year-old man on low-molecular-weight heparin has bleeding. How does protamine reversal of low-molecular-weight heparin compare with its reversal of unfractionated heparin?
- Protamine only partially reverses low-molecular-weight heparin
- Protamine fully reverses low-molecular-weight heparin
- Protamine has no effect on either
- Protamine reverses low-molecular-weight heparin better than unfractionated heparin
Correct answer: Protamine only partially reverses low-molecular-weight heparin
Protamine only partially reverses low-molecular-weight heparin is correct because protamine neutralizes unfractionated heparin completely but only partially reverses low-molecular-weight heparin. It does reverse unfractionated heparin, and it is less effective for low-molecular-weight heparin rather than more effective.
- A 67-year-old woman on warfarin presents with a minor nosebleed that stops with pressure and an INR of 4.0. What is the most appropriate management?
- Give four-factor prothrombin complex concentrate
- Hold one or more warfarin doses and recheck the INR without routine reversal agents
- Administer intravenous vitamin K urgently
- Transfuse fresh frozen plasma
Correct answer: Hold one or more warfarin doses and recheck the INR without routine reversal agents
Hold one or more warfarin doses and recheck the INR without routine reversal agents is correct because minor bleeding with a modestly elevated INR is managed by holding warfarin and rechecking, reserving reversal agents for serious bleeding. Prothrombin complex concentrate, urgent vitamin K, and plasma are excessive for a self-limited minor bleed.
- A 60-year-old man requires reversal of warfarin for major bleeding. Why is four-factor prothrombin complex concentrate generally preferred over fresh frozen plasma in this situation?
- It is an anticoagulant
- It contains no clotting factors
- It reverses the INR faster, requires a smaller volume, and avoids large-volume fluid loads
- It works more slowly than plasma
Correct answer: It reverses the INR faster, requires a smaller volume, and avoids large-volume fluid loads
It reverses the INR faster, requires a smaller volume, and avoids large-volume fluid loads is correct because prothrombin complex concentrate provides rapid, concentrated factor replacement with less volume than plasma, advantageous in major bleeding. It is not an anticoagulant, contains the relevant clotting factors, and works faster, not slower, than plasma.
- A 55-year-old woman on warfarin is scheduled for an elective procedure with a high bleeding risk. What is the appropriate approach to her anticoagulation before the procedure?
- Continue warfarin and reverse it with vitamin K on the day of surgery
- Give protamine before the procedure
- Increase the warfarin dose preoperatively
- Hold warfarin several days beforehand to allow the INR to normalize, with bridging only if indicated
Correct answer: Hold warfarin several days beforehand to allow the INR to normalize, with bridging only if indicated
Hold warfarin several days beforehand to allow the INR to normalize, with bridging only if indicated is correct because elective procedures with bleeding risk require stopping warfarin in advance, with bridging anticoagulation reserved for high thromboembolic risk. Same-day reversal, protamine, and increasing warfarin are inappropriate planned strategies.
- A 70-year-old man on dabigatran with renal impairment has major bleeding and idarucizumab is unavailable. Which intervention can help remove the drug given its renal clearance?
- Hemodialysis
- Protamine sulfate
- Vitamin K
- Andexanet alfa, which targets dabigatran
Correct answer: Hemodialysis
Hemodialysis is correct because dabigatran is dialyzable, so hemodialysis can help remove it when the specific reversal agent is unavailable. Protamine and vitamin K do not reverse dabigatran, and andexanet alfa targets factor Xa inhibitors rather than the direct thrombin inhibitor.
- A 64-year-old woman is started on warfarin and counseled about its mechanism and reversal. Warfarin reduces the activity of which clotting factors?
- Only factor VIII
- The vitamin K-dependent factors II, VII, IX, and X
- Only fibrinogen
- Platelets directly
Correct answer: The vitamin K-dependent factors II, VII, IX, and X
The vitamin K-dependent factors II, VII, IX, and X is correct because warfarin inhibits vitamin K-dependent gamma-carboxylation of these factors (and proteins C and S), which is why vitamin K and concentrates of these factors reverse it. It does not act on factor VIII or fibrinogen alone or directly on platelets.
- A 59-year-old man on warfarin presents with major bleeding, and reversal is initiated. Why does giving prothrombin complex concentrate work more quickly than vitamin K alone?
- It stimulates platelet production
- It is a vitamin K analog
- It directly replaces the deficient clotting factors rather than relying on new synthesis
- It works by removing warfarin from the blood
Correct answer: It directly replaces the deficient clotting factors rather than relying on new synthesis
It directly replaces the deficient clotting factors rather than relying on new synthesis is correct because prothrombin complex concentrate supplies the factors immediately, whereas vitamin K requires time for the liver to synthesize new factors. It does not stimulate platelets, is not a vitamin K analog, and does not remove warfarin from the blood.
- A 66-year-old man on warfarin develops a major bleed; after reversal, when can anticoagulation be reconsidered?
- Never resume anticoagulation after any bleed
- Resume immediately during active bleeding
- Resume only after 1 year regardless of indication
- Resume anticoagulation once hemostasis is secured and the thrombotic risk outweighs the bleeding risk
Correct answer: Resume anticoagulation once hemostasis is secured and the thrombotic risk outweighs the bleeding risk
Resume anticoagulation once hemostasis is secured and the thrombotic risk outweighs the bleeding risk is correct because resumption is individualized, balancing the original thrombotic indication against rebleeding risk after the bleeding is controlled. Never resuming, resuming during active bleeding, and a fixed arbitrary delay are not appropriate blanket rules.
- A 58-year-old woman on a factor Xa inhibitor has major bleeding, and the specific reversal agent is not available. Which agent is sometimes used as an alternative to help control bleeding?
- Four-factor prothrombin complex concentrate
- Protamine sulfate
- Idarucizumab
- Vitamin K
Correct answer: Four-factor prothrombin complex concentrate
Four-factor prothrombin complex concentrate is correct because it can be used to help control major factor Xa inhibitor-associated bleeding when the specific antidote andexanet alfa is unavailable. Protamine reverses heparin, idarucizumab reverses dabigatran, and vitamin K reverses warfarin.
- A 71-year-old man on warfarin has a critically high INR. Which laboratory value is monitored to assess the degree of warfarin anticoagulation and guide reversal?
- The activated partial thromboplastin time as the primary monitor
- The international normalized ratio (INR)
- The platelet count
- The bleeding time
Correct answer: The international normalized ratio (INR)
The international normalized ratio (INR) is correct because the INR standardizes the prothrombin time to monitor warfarin's effect and guide reversal. The activated partial thromboplastin time monitors heparin, and the platelet count and bleeding time do not measure warfarin's anticoagulant intensity.
- A 63-year-old woman on warfarin presents with bleeding, and the clinician weighs the urgency of reversal. Which factor most determines whether rapid reversal with prothrombin complex concentrate is indicated?
- The patient's age alone
- The brand of warfarin
- The severity and location of bleeding, such as life-threatening or intracranial hemorrhage
- The time of day
Correct answer: The severity and location of bleeding, such as life-threatening or intracranial hemorrhage
The severity and location of bleeding, such as life-threatening or intracranial hemorrhage is correct because the bleeding severity and critical sites drive the decision for rapid factor-concentrate reversal. Age alone, the warfarin brand, and the time of day do not determine the need for urgent reversal.
- A 60-year-old man on heparin develops bleeding, and protamine is dosed based on the amount of heparin given. What adverse effect should be monitored for with protamine administration?
- Hyperkalemia
- Hyperthyroidism
- Hypoglycemia
- Hypotension and anaphylactoid reactions
Correct answer: Hypotension and anaphylactoid reactions
Hypotension and anaphylactoid reactions is correct because protamine can cause hypotension, bradycardia, and anaphylactoid reactions, particularly with rapid infusion. Hyperkalemia, hyperthyroidism, and hypoglycemia are not the characteristic adverse effects of protamine.
- A 67-year-old woman on warfarin presents with major bleeding and is reversed. Why is fresh frozen plasma sometimes a less ideal choice than prothrombin complex concentrate for urgent warfarin reversal?
- It requires large volumes, thawing time, and may incompletely or slowly correct the INR
- It contains no clotting factors at all
- It is an anticoagulant
- It reverses heparin instead of warfarin
Correct answer: It requires large volumes, thawing time, and may incompletely or slowly correct the INR
It requires large volumes, thawing time, and may incompletely or slowly correct the INR is correct because plasma needs thawing, large volumes, and may not fully or quickly correct the INR compared with concentrated factor products. It does contain clotting factors, is not an anticoagulant, and is not specific to heparin reversal.
- A 66-year-old man with a COPD exacerbation is treated with short-acting bronchodilators and steroids but continues to have moderate dyspnea with adequate oxygenation and no acidosis. What is the most appropriate next step?
- Immediately intubate the patient
- Continue and optimize bronchodilator and steroid therapy with close reassessment
- Stop all bronchodilators
- Begin long-term home oxygen during the acute exacerbation
Correct answer: Continue and optimize bronchodilator and steroid therapy with close reassessment
Continue and optimize bronchodilator and steroid therapy with close reassessment is correct because a patient improving without acidosis or respiratory failure should have ongoing optimized medical therapy and monitoring rather than escalation. Intubation is not yet indicated, stopping bronchodilators removes benefit, and home oxygen is a chronic decision made after recovery.
- A 59-year-old man presents with a hypertensive emergency and severe headache, and the team selects an intravenous agent. Why are oral or sublingual immediate-release agents avoided for initial control in a true hypertensive emergency?
- They are too slow to have any effect
- They raise blood pressure
- They cause unpredictable and potentially excessive drops in blood pressure
- They cannot be administered to inpatients
Correct answer: They cause unpredictable and potentially excessive drops in blood pressure
They cause unpredictable and potentially excessive drops in blood pressure is correct because immediate-release oral or sublingual agents produce uncontrolled, sometimes precipitous reductions that risk organ hypoperfusion, so titratable intravenous agents are preferred. They are not ineffective, do not raise blood pressure, and can be given to inpatients but are simply not ideal here.
- A 74-year-old man with acute kidney injury is evaluated, and the team distinguishes the three broad categories of kidney injury. Which sequence correctly orders the categories by anatomic location relative to the kidney?
- Postrenal, prerenal, then intrinsic by frequency only
- Intrinsic, prerenal, and postrenal all meaning the same thing
- Prerenal and postrenal are identical processes
- Prerenal (before the kidney), intrinsic (within the kidney), and postrenal (after the kidney)
Correct answer: Prerenal (before the kidney), intrinsic (within the kidney), and postrenal (after the kidney)
Prerenal (before the kidney), intrinsic (within the kidney), and postrenal (after the kidney) is correct because acute kidney injury is classified by where the problem lies relative to the kidney, guiding the workup and treatment. The other options conflate or misstate these distinct anatomic categories.
- A 10-month-old boy is brought to the emergency department after his parents found him drowsy and difficult to rouse following a morning of episodic screaming. He has had no diarrhea or vomiting. On examination he is pale and lethargic, but his abdomen is soft with a vague fullness on the right. The triage nurse is focused on the altered mental status and orders a head CT. Which alternative diagnosis must be actively excluded before pursuing a neurologic workup?
- Intussusception
- Simple febrile seizure
- Migraine variant
- Benign breath-holding spell
Correct answer: Intussusception
Intussusception is correct because lethargy can be the dominant or even sole presenting feature in an infant, sometimes overshadowing abdominal symptoms and mimicking a neurologic problem. The history of episodic screaming and a vague abdominal fullness should prompt an abdominal ultrasound before an unnecessary neurologic workup. Febrile seizure, migraine, and breath-holding spells do not explain the abdominal findings or the pattern of paroxysmal pain.
- A 2-year-old with Henoch-Schonlein purpura develops crampy abdominal pain, vomiting, and bloody stools. He is hemodynamically stable. Which complication of his underlying vasculitis should be highest on the differential for these new gastrointestinal symptoms?
- Acute pancreatitis
- Intussusception
- Peptic ulcer perforation
- Toxic megacolon
Correct answer: Intussusception
Intussusception is correct because Henoch-Schonlein purpura can produce bowel wall edema and hematoma that act as a pathologic lead point, classically causing an ileoileal intussusception with colicky pain and bloody stools. This association is a recognized cause of intussusception outside the typical idiopathic age range. Pancreatitis, ulcer perforation, and toxic megacolon are not the characteristic vasculitis-related cause of this presentation.
- A 7-month-old with suspected intussusception is stable, but the clinician must counsel the family about why an air enema is chosen over a barium enema for reduction. What is the principal advantage of air (pneumatic) reduction in this setting?
- It provides better detail of the mucosal lead point
- It can be performed without any imaging guidance
- It causes less peritoneal contamination if perforation occurs
- It is therapeutic but never diagnostic
Correct answer: It causes less peritoneal contamination if perforation occurs
Less peritoneal contamination if perforation occurs is correct because if the bowel perforates during reduction, escaped air causes far less chemical and bacterial peritonitis than escaped barium, making pneumatic reduction safer. Air reduction is performed under fluoroscopic guidance, not without imaging, and like contrast enema it is both diagnostic and therapeutic, so the other statements are inaccurate.
- During an air enema reduction attempt for ileocolic intussusception, the radiologist notes that the column of air will not advance past a fixed point despite appropriate pressure, and the child remains stable. After a brief rest, a repeat attempt also stalls at the same point without complete reduction. What is the most appropriate next step?
- Indefinite repeated enema attempts every hour
- Discharge with outpatient ultrasound
- Switch to oral contrast and observe
- Surgical consultation for operative reduction
Correct answer: Surgical consultation for operative reduction
Surgical consultation for operative reduction is correct because failure of pneumatic reduction after appropriate attempts is an indication for surgery to manually reduce the bowel and assess for a lead point or nonviable segment. Continuing endless enema attempts risks perforation, and discharge or switching to oral contrast would leave the obstruction untreated in a time-sensitive surgical condition.
- A 3-week-old neonate is being evaluated for bilious emesis and a tender abdomen. The surgical team is debating between malrotation with midgut volvulus and intussusception. Which feature makes idiopathic intussusception an unlikely explanation in this neonate?
- The neonate's age below the typical onset window
- The presence of vomiting
- Abdominal tenderness on examination
- A recent viral illness in the family
Correct answer: The neonate's age below the typical onset window
The neonate's age below the typical onset window is correct because idiopathic intussusception characteristically begins after about 3 months and peaks between 6 months and 2 years, so it would be distinctly unusual in a 3-week-old. In this age group bilious emesis should raise strong concern for malrotation with volvulus. Vomiting, tenderness, and a viral exposure do not by themselves distinguish the two conditions.
- A previously healthy 11-month-old has had three classic episodes of colicky pain over the past week, each resolving spontaneously, and an ultrasound today again shows a transient ileoileal intussusception that reduces on its own. There is no obstruction and the child is well. What does the recurrent, spontaneously reducing pattern most appropriately prompt?
- Immediate prophylactic bowel resection
- A search for a pathologic lead point
- Lifelong antispasmodic therapy
- Reassurance that no further evaluation is needed
Correct answer: A search for a pathologic lead point
A search for a pathologic lead point is correct because recurrent intussusception, particularly when ileoileal or outside the usual idiopathic pattern, raises concern for an anatomic lead point such as a polyp, duplication cyst, or Meckel diverticulum that warrants further imaging or evaluation. Prophylactic resection without a target and lifelong antispasmodics are inappropriate, and simply reassuring the family overlooks the need to investigate recurrence.
- A 9-month-old presents with intussusception and the plain abdominal radiograph obtained during triage shows a soft tissue mass in the right upper quadrant with a paucity of bowel gas distally. How should this plain film finding influence the diagnostic plan?
- It confirms perforation and mandates immediate laparotomy
- It rules out intussusception
- It is suggestive but ultrasound remains the preferred confirmatory study
- It indicates the need for a contrast CT before any treatment
Correct answer: It is suggestive but ultrasound remains the preferred confirmatory study
Ultrasound remaining the preferred confirmatory study is correct because plain films can suggest intussusception with a soft tissue mass and reduced distal gas but are neither sensitive nor specific, so ultrasound is used to confirm the target sign before reduction. The film does not by itself confirm perforation, exclude the diagnosis, or mandate CT, which is not the standard imaging pathway for suspected intussusception.
- A 6-month-old with confirmed intussusception is being prepared for pneumatic reduction. The surgical team is consulted to be available. What is the primary reason surgical backup is arranged before attempting nonoperative reduction?
- To perform the enema themselves
- To obtain consent for routine resection
- Because surgery is always performed after successful reduction
- In case perforation or failed reduction requires immediate operation
Correct answer: In case perforation or failed reduction requires immediate operation
Having surgery available in case perforation or failed reduction requires immediate operation is correct because pneumatic reduction carries a small risk of perforation and may not succeed, so a surgeon should be ready to intervene promptly. Surgeons do not routinely perform the enema, consent for resection is not a foregone conclusion, and surgery is not done after every successful nonoperative reduction.
- An infant successfully treated for intussusception is discharged. The parents ask what symptoms should bring them back urgently. Which set of returning symptoms most specifically suggests recurrent intussusception rather than a benign post-illness course?
- Return of paroxysmal severe colicky pain with episodes of pallor
- Mild low-grade fever and fussiness with feeds
- A single loose stool and decreased appetite for one meal
- Brief hiccups after feeding
Correct answer: Return of paroxysmal severe colicky pain with episodes of pallor
Return of paroxysmal severe colicky pain with pallor is correct because recurrence of intussusception reproduces the original pattern of episodic, intense crampy pain often with pallor or lethargy between episodes, which should prompt urgent re-evaluation. A mild fever, an isolated loose stool, or hiccups are nonspecific and do not by themselves suggest recurrent telescoping of the bowel.
- A 13-month-old is admitted with intussusception that has been present for over 48 hours, and he now has fever, a rigid abdomen, and signs of shock. The team is considering reduction options. Why is nonoperative enema reduction contraindicated in this particular child?
- Because his age exceeds the treatable range
- Because peritonitis and shock indicate compromised bowel requiring surgery
- Because enema reduction only works within the first hour of symptoms
- Because fever alone always contraindicates reduction
Correct answer: Because peritonitis and shock indicate compromised bowel requiring surgery
Peritonitis and shock indicating compromised bowel requiring surgery is correct because signs of perforation, peritonitis, or hemodynamic instability mean the bowel may be necrotic, and increasing intraluminal pressure with an enema could worsen perforation, so operative management is required. Age does not exclude treatment, reduction is not limited to the first hour, and fever by itself does not contraindicate a reduction attempt in a stable child.
- A 6-month-old presents with intussusception and the parents recall he received a rotavirus vaccine recently. They are anxious about the link. What is the most accurate counseling regarding rotavirus vaccination and intussusception?
- The vaccine is the most common cause of intussusception in infants
- The vaccine guarantees the child will have recurrent intussusception
- There is a small attributable risk, but the benefit of preventing severe rotavirus disease outweighs it
- Vaccinated infants cannot develop intussusception from other causes
Correct answer: There is a small attributable risk, but the benefit of preventing severe rotavirus disease outweighs it
A small attributable risk with benefits outweighing it is correct because current rotavirus vaccines carry only a small increased risk of intussusception in the weeks after the first doses, and this is far outweighed by protection against severe, sometimes fatal, rotavirus gastroenteritis. The vaccine is not the leading cause of intussusception, does not guarantee recurrence, and does not prevent intussusception from other causes such as idiopathic lymphoid hyperplasia.
- A stable 8-month-old has intussusception confirmed by ultrasound. The clinician explains that the air enema serves two purposes simultaneously. Which statement best captures the dual role of the air enema in this child?
- It is purely diagnostic and a separate procedure treats the condition
- It is only therapeutic and provides no diagnostic information
- It is used solely to prepare the bowel before surgery
- It is both the confirmatory imaging maneuver and the definitive nonoperative treatment
Correct answer: It is both the confirmatory imaging maneuver and the definitive nonoperative treatment
Being both the confirmatory maneuver and definitive nonoperative treatment is correct because the air enema demonstrates the intussusception under fluoroscopy and, by raising intraluminal pressure, reduces it in the same procedure for most stable children. It is not purely diagnostic, not purely therapeutic, and not merely a bowel-prep step before mandatory surgery, since successful reduction typically avoids an operation.
- A 5-week-old boy is diagnosed with hypertrophic pyloric stenosis after weeks of projectile vomiting. His parents, who are both healthy, ask why this happened. Which statement about the typical cause and inheritance pattern of this condition is most accurate?
- It is multifactorial, with increased risk if a parent was affected
- It is a single-gene autosomal recessive disorder
- It is caused by maternal alcohol use in pregnancy
- It results from an in utero viral infection
Correct answer: It is multifactorial, with increased risk if a parent was affected
Being multifactorial with increased familial risk is correct because hypertrophic pyloric stenosis arises from a combination of genetic predisposition and environmental factors, and the risk is higher in infants whose parent, especially the mother, had the condition. It is not a simple autosomal recessive single-gene disorder, and it is not caused by maternal alcohol use or an intrauterine viral infection.
- A 4-week-old with worsening nonbilious vomiting has been associated in recent reports with early postnatal exposure to a particular class of medications. Exposure to which medication in the first weeks of life has been linked to an increased risk of hypertrophic pyloric stenosis?
- Acetaminophen
- Macrolide antibiotics such as erythromycin
- Oral iron supplements
- Topical corticosteroids
Correct answer: Macrolide antibiotics such as erythromycin
Macrolide antibiotics such as erythromycin are correct because early neonatal exposure to macrolides has been associated with an increased risk of developing hypertrophic pyloric stenosis. Acetaminophen, oral iron, and topical corticosteroids have not been linked to pyloric stenosis, making the macrolide association the relevant medication-related risk factor to recognize.
- A 5-week-old infant with several days of projectile vomiting arrives lethargic and poorly perfused with sunken eyes and delayed capillary refill. The bedside glucose is normal. Before any imaging or surgical planning, what is the single most important immediate priority?
- Schedule pyloromyotomy within the hour
- Obtain an upper GI contrast study
- Restore intravascular volume with isotonic fluid resuscitation
- Start a proton pump inhibitor
Correct answer: Restore intravascular volume with isotonic fluid resuscitation
Restoring intravascular volume with isotonic fluid resuscitation is correct because the infant shows signs of significant dehydration and hypoperfusion, which must be treated first to stabilize the child and begin correcting the metabolic derangements. Pyloromyotomy is never an emergency and is unsafe before resuscitation, imaging can wait until the child is stabilized, and acid suppression does not treat the obstruction or the dehydration.
- A 6-week-old with pyloric stenosis has a venous blood gas showing pH 7.52 and bicarbonate 36 mEq/L with chloride 86 mEq/L. The team plans intravenous fluids. Which fluid composition is most appropriate for resuscitation and correction in this infant?
- Free water (D5W) without electrolytes
- Sodium bicarbonate infusion to raise the pH
- Lactated Ringer with no potassium ever added
- Normal saline with potassium added once urine output is established
Correct answer: Normal saline with potassium added once urine output is established
Normal saline with potassium added once urine output is established is correct because the infant needs chloride-rich isotonic fluid to correct the hypochloremic alkalosis and volume depletion, with potassium added after adequate renal perfusion is confirmed to safely replace the deficit. Free water alone fails to replace chloride and sodium, bicarbonate would worsen the existing alkalosis, and withholding potassium entirely ignores the significant hypokalemia.
- A 5-week-old with pyloric stenosis is being differentiated from an infant with severe gastroesophageal reflux. Which feature most strongly favors pyloric stenosis over uncomplicated reflux?
- Projectile nonbilious vomiting with progressive weight loss and dehydration
- Effortless spitting up after feeds with normal weight gain
- Symptoms that improve with upright positioning after feeds
- Vomiting that contains streaks of bile
Correct answer: Projectile nonbilious vomiting with progressive weight loss and dehydration
Projectile nonbilious vomiting with progressive weight loss and dehydration is correct because pyloric stenosis causes forceful, worsening vomiting and a failing nutritional state, whereas uncomplicated reflux causes effortless spitting up in a thriving infant. Improvement with upright positioning suggests reflux, and bile in the vomitus points to an obstruction distal to the ampulla rather than the proximal pyloric obstruction of pyloric stenosis.
- A 4-week-old with confirmed pyloric stenosis has been fully resuscitated and the electrolytes are normal. The infant undergoes pyloromyotomy. A few hours postoperatively the infant has one or two episodes of emesis. How should the surgical team interpret this early postoperative vomiting?
- It indicates the pyloromyotomy was incomplete and requires immediate reoperation
- It is often transient and feeds can typically be advanced as tolerated
- It signals a missed duodenal atresia
- It means the infant must be made nil by mouth for a week
Correct answer: It is often transient and feeds can typically be advanced as tolerated
Being often transient with feeds advanced as tolerated is correct because some vomiting is common in the first hours after pyloromyotomy due to edema and gastric dysmotility, and most infants tolerate gradual reintroduction of feeds. Isolated early emesis does not indicate an incomplete myotomy requiring reoperation, does not point to duodenal atresia, and does not warrant prolonged bowel rest.
- A 5-week-old presents with projectile vomiting, and on examination the clinician palpates the epigastrium deeply during a moment when the infant is calm and the stomach is empty. What maneuver best improves the chance of palpating the characteristic mass in pyloric stenosis?
- Palpating immediately after a large feeding
- Pressing firmly only during active crying
- Examining a calm infant with an empty stomach, sometimes after gastric decompression
- Examining only in the left lower quadrant
Correct answer: Examining a calm infant with an empty stomach, sometimes after gastric decompression
Examining a calm infant with an empty stomach, sometimes after gastric decompression, is correct because relaxation of the abdominal wall and an empty stomach make the firm, olive-shaped pylorus easier to feel in the epigastrium or right upper quadrant. Palpating just after a feeding or during crying tightens the abdomen and obscures the mass, and the pylorus is not located in the left lower quadrant.
- A 6-week-old infant with pyloric stenosis has profound hypokalemia. The team is cautious about the timing of potassium replacement. Why must adequate urine output be confirmed before aggressively replacing potassium intravenously?
- Because potassium cannot be given until alkalosis fully resolves
- Because potassium worsens dehydration
- Because potassium directly relaxes the pylorus
- Because impaired renal excretion risks dangerous hyperkalemia if urine output is inadequate
Correct answer: Because impaired renal excretion risks dangerous hyperkalemia if urine output is inadequate
Impaired renal excretion risking dangerous hyperkalemia is correct because giving potassium to an oliguric, volume-depleted infant who cannot excrete it can precipitate life-threatening hyperkalemia, so urine output confirms the kidneys can handle the load. Potassium replacement is not deferred until alkalosis resolves, does not worsen dehydration, and has no direct effect on relaxing the pyloric muscle.
- A 5-week-old with several weeks of projectile vomiting has the following on examination: poor skin turgor, a depressed anterior fontanelle, and few wet diapers. Which combination of findings best reflects the expected acid-base and volume state in advanced pyloric stenosis?
- Volume depletion with hypochloremic hypokalemic metabolic alkalosis
- Euvolemia with normal electrolytes
- Volume overload with metabolic acidosis
- Dehydration with respiratory acidosis
Correct answer: Volume depletion with hypochloremic hypokalemic metabolic alkalosis
Volume depletion with hypochloremic hypokalemic metabolic alkalosis is correct because protracted vomiting of gastric acid causes loss of hydrogen and chloride and, through renal compensation, potassium wasting, all on a background of dehydration. The infant is not euvolemic with normal labs, is not volume overloaded, and does not have a primary respiratory acidosis; the hallmark is the alkalotic, chloride- and potassium-depleted dehydrated state.
- A 4-week-old infant is admitted with suspected pyloric stenosis, but the initial ultrasound shows a pyloric muscle thickness at the borderline and the infant continues to vomit. What is the most appropriate next step?
- Discharge the infant as pyloric stenosis is excluded
- Repeat the ultrasound after a short interval or obtain an upper GI study if symptoms persist
- Proceed directly to pyloromyotomy
- Begin long-term thickened feeds and discharge
Correct answer: Repeat the ultrasound after a short interval or obtain an upper GI study if symptoms persist
Repeating the ultrasound after a short interval or obtaining an upper GI study is correct because early pyloric hypertrophy can be borderline, and persistent symptoms warrant re-imaging or an upper GI series to demonstrate the elongated channel before committing to surgery. A single borderline study does not exclude the diagnosis or justify discharge, and operating or starting chronic feeds without a confirmed diagnosis would be inappropriate.
- A 5-week-old with pyloric stenosis is described by the parents as still eager to feed despite vomiting nearly every feed back up forcefully. Which term best describes this characteristic behavior and what does it reflect?
- Anorexia, reflecting loss of appetite from the illness
- Satiety, reflecting adequate caloric intake
- A hungry vomiter, reflecting that nutrients never reach the intestine for absorption
- Food aversion, reflecting esophageal pain
Correct answer: A hungry vomiter, reflecting that nutrients never reach the intestine for absorption
A hungry vomiter reflecting that nutrients never reach the intestine is correct because the gastric outlet obstruction prevents feeds from passing into the duodenum, so the infant vomits yet remains hungry and feeds eagerly afterward. This contrasts with anorexia or food aversion, and the infant is not satiated because little nutrition is actually absorbed, which contributes to the weight loss seen in the condition.
- A 6-week-old undergoes successful pyloromyotomy and is recovering well, tolerating feeds. The parents ask whether the problem will return as the child grows. What is the most accurate counseling about the long-term outcome after pyloromyotomy?
- The condition commonly recurs and requires repeat surgery
- The child will require lifelong acid-suppression therapy
- Normal growth is rarely achieved after surgery
- The cure is generally permanent with an excellent long-term prognosis
Correct answer: The cure is generally permanent with an excellent long-term prognosis
A generally permanent cure with an excellent prognosis is correct because pyloromyotomy definitively relieves the obstruction and infants typically resume normal feeding and growth without recurrence. The condition does not commonly recur requiring repeat surgery, lifelong acid suppression is not needed, and normal growth is the expected outcome once the mechanical obstruction is corrected.
- A 20-month-old has a brief generalized seizure during a febrile illness. While taking the history, the clinician notes that the child's father and an older sibling both had febrile seizures as toddlers. How should this family history influence the assessment of recurrence risk?
- A positive family history increases the likelihood of recurrent febrile seizures
- It has no bearing on recurrence risk
- It confirms the child has epilepsy
- It mandates immediate genetic testing
Correct answer: A positive family history increases the likelihood of recurrent febrile seizures
A positive family history increasing the likelihood of recurrence is correct because a family history of febrile seizures, along with young age at first seizure, is a recognized risk factor for having additional febrile seizures. It does not establish a diagnosis of epilepsy, does not mandate genetic testing, and is certainly relevant rather than irrelevant to counseling families about the chance of recurrence.
- An 18-month-old has a simple febrile seizure during a high fever. The parents, terrified during the event, ask what they should do if their child has another seizure at home. What is the most appropriate first-aid guidance to give the family?
- Place an object in the mouth to prevent tongue biting
- Position the child safely on their side, protect from injury, and time the seizure
- Restrain the child's limbs firmly until the seizure stops
- Immediately attempt mouth-to-mouth breathing
Correct answer: Position the child safely on their side, protect from injury, and time the seizure
Positioning the child safely on their side, protecting from injury, and timing the seizure is correct because these measures keep the airway clear, prevent harm, and identify a prolonged seizure that needs emergency care. Placing objects in the mouth risks injury and aspiration, forcibly restraining the limbs can cause harm, and routine rescue breathing during a typical brief seizure is not recommended; safe positioning is the priority.
- A 19-month-old had a first simple febrile seizure six months ago and now presents with another brief generalized seizure during a new febrile illness. He is well between events with normal development and a nonfocal exam. How does this second simple febrile seizure change the diagnosis and management?
- It now meets the definition of epilepsy and requires daily antiepileptics
- It mandates an immediate MRI and EEG
- It remains a benign recurrence of simple febrile seizures managed with reassurance
- It requires admission for prolonged observation
Correct answer: It remains a benign recurrence of simple febrile seizures managed with reassurance
Remaining a benign recurrence managed with reassurance is correct because recurrent simple febrile seizures in a developmentally normal child with a nonfocal exam are still benign and do not constitute epilepsy, which requires unprovoked seizures. A second febrile seizure does not by itself warrant daily anticonvulsants, routine neuroimaging and EEG, or hospital admission when the events are simple.
- A 14-month-old who had a simple febrile seizure last year is brought in with a new fever. The anxious parents ask whether giving scheduled antipyretics at the first sign of fever will prevent a recurrence. What is the most evidence-based response?
- Scheduled antipyretics reliably prevent recurrent febrile seizures
- Antipyretics should be avoided entirely in these children
- Only rectal antipyretics prevent recurrence
- Antipyretics improve comfort but do not reliably prevent febrile seizure recurrence
Correct answer: Antipyretics improve comfort but do not reliably prevent febrile seizure recurrence
Antipyretics improving comfort but not reliably preventing recurrence is correct because studies show that aggressive or scheduled antipyretic use does not dependably prevent febrile seizures, although fever-reducing medicines can make the child more comfortable. Antipyretics are not contraindicated in these children, and no particular route, including rectal, has been shown to prevent recurrence.
- A 15-month-old presents in the postictal period after what the parents describe as a febrile seizure, but on examination the clinician finds neck stiffness, persistent irritability, and a petechial rash. The temperature is 39.6 C. How should this presentation alter the standard benign approach to a febrile seizure?
- Pursue urgent evaluation for bacterial meningitis including lumbar puncture
- Treat as a simple febrile seizure and discharge
- Order an outpatient EEG and reassure
- Begin maintenance anticonvulsants
Correct answer: Pursue urgent evaluation for bacterial meningitis including lumbar puncture
Pursuing urgent evaluation for bacterial meningitis including lumbar puncture is correct because meningeal signs, persistent altered behavior, and a petechial rash suggest a serious central nervous system infection rather than a simple febrile seizure, demanding immediate workup and empiric treatment. Discharging the child, deferring to outpatient EEG, or starting maintenance anticonvulsants would dangerously miss a potential life-threatening infection.
- A 14-month-old is having a generalized convulsion that has now lasted more than 5 minutes in the emergency department, with a documented fever. Intravenous access has not yet been obtained. What is the most appropriate immediate intervention?
- Wait for intravenous access before any medication
- Administer intramuscular or intranasal benzodiazepine and support the airway
- Give a loading dose of intravenous phenytoin first
- Perform immediate lumbar puncture during the seizure
Correct answer: Administer intramuscular or intranasal benzodiazepine and support the airway
Administering an intramuscular or intranasal benzodiazepine and supporting the airway is correct because a febrile seizure lasting beyond 5 minutes should be treated as evolving status epilepticus, and benzodiazepines can be given by non-intravenous routes when access is delayed. Waiting for an IV wastes critical time, second-line agents like phenytoin follow a benzodiazepine, and lumbar puncture is not performed during an active convulsion before stabilization.
- A 2-year-old had a febrile seizure that lasted about 20 minutes and was generalized, without focal features, and did not recur. CNS infection has been excluded and the child is back to baseline. According to standard classification, how should this seizure be categorized?
- Simple febrile seizure
- Afebrile generalized seizure
- Complex febrile seizure
- Absence seizure
Correct answer: Complex febrile seizure
Complex febrile seizure is correct because a febrile seizure that is prolonged beyond about 15 minutes, focal, or recurs within 24 hours is classified as complex, and this seizure qualifies on the basis of its duration. It is not a simple febrile seizure given the prolonged length, and it is neither an afebrile seizure nor an absence seizure, which have different defining features.
- A 16-month-old presents after a febrile seizure, and the parents recall the seizure occurred shortly after the child received a vaccination earlier that week. They worry the vaccine 'damaged' the brain. What is the most accurate counseling about vaccine-associated febrile seizures?
- Vaccines commonly cause permanent brain injury through febrile seizures
- A febrile seizure after vaccination means the vaccine series must be stopped permanently
- Febrile seizures after vaccines are always complex and dangerous
- Some vaccines can transiently raise fever and rarely provoke a benign febrile seizure without long-term harm
Correct answer: Some vaccines can transiently raise fever and rarely provoke a benign febrile seizure without long-term harm
Some vaccines transiently raising fever and rarely provoking a benign febrile seizure without long-term harm is correct because fever from certain vaccines can occasionally trigger a simple febrile seizure, which carries the same benign prognosis as other febrile seizures. Vaccines do not commonly cause permanent brain injury, a vaccine-associated febrile seizure does not require stopping immunizations, and such seizures are not inherently complex or dangerous.
- A 17-month-old fully immunized, well-appearing child has a simple febrile seizure and is now at baseline with no meningeal signs. The clinician decides against routine blood tests and neuroimaging. What is the best justification for this limited workup?
- In a well child with a simple febrile seizure, evaluation should target the source of fever, not the seizure
- Testing is withheld to reduce hospital costs only
- Laboratory tests are inaccurate in toddlers
- Imaging is unavailable for children under 2 years
Correct answer: In a well child with a simple febrile seizure, evaluation should target the source of fever, not the seizure
Targeting the source of fever rather than the seizure is correct because a simple febrile seizure in a well-appearing, immunized child is benign, so the evaluation should focus on identifying and treating the febrile illness, with routine bloodwork and neuroimaging not indicated. The rationale is clinical appropriateness rather than cost alone, and it is not because tests are inaccurate in toddlers or imaging is unavailable for young children.
- Parents of a 14-month-old who just had a first simple febrile seizure ask about the overall risk of their child eventually developing epilepsy. Which statement most accurately reflects the long-term epilepsy risk after a single simple febrile seizure?
- The risk of epilepsy is over 50 percent
- The risk is only slightly higher than the baseline population risk
- The risk is zero because febrile seizures protect against epilepsy
- The risk is the same as that following febrile status epilepticus
Correct answer: The risk is only slightly higher than the baseline population risk
The risk being only slightly higher than baseline is correct because after a single simple febrile seizure the lifetime risk of epilepsy rises only modestly above the general population's low baseline. It is not above 50 percent, it is not zero since there is a small increase, and it is lower than the risk associated with complex or prolonged febrile seizures such as febrile status epilepticus.
- A 13-month-old who had a febrile seizure is being assessed for risk factors that increase the chance of future febrile seizures. Which of the following is a recognized risk factor for recurrence of febrile seizures?
- Older age at the first febrile seizure
- A single prior episode with very high fever
- First febrile seizure at a young age and a lower peak temperature at onset
- Absence of any family history
Correct answer: First febrile seizure at a young age and a lower peak temperature at onset
A first febrile seizure at a young age and a lower peak temperature at onset is correct because younger age at onset and a relatively low fever threshold at the time of seizure are established predictors of recurrence, along with a positive family history and a short interval between fever onset and seizure. Older age at onset, a single high-fever episode, and absence of family history are associated with lower, not higher, recurrence risk.
- A toddler is seen after a brief generalized febrile seizure, and the medical student asks what is thought to underlie why young children are prone to seizing with fever. Which explanation best reflects the current understanding of febrile seizure susceptibility?
- A structural brain lesion is always present
- An underlying metabolic poisoning from the fever itself
- A deficiency of antipyretic enzymes in toddlers
- An age-dependent vulnerability of the developing brain to fever, often with genetic predisposition
Correct answer: An age-dependent vulnerability of the developing brain to fever, often with genetic predisposition
An age-dependent vulnerability of the developing brain with genetic predisposition is correct because febrile seizures reflect a temporary, maturation-related susceptibility of the young brain to fever, frequently in genetically predisposed children, which is why they occur in a defined age window and resolve as the child matures. They are not caused by an inevitable structural lesion, metabolic poisoning, or a deficiency of antipyretic enzymes.
- A 3-year-old in the subacute phase of treated Kawasaki disease has a markedly elevated platelet count on routine labs. Why is thrombocytosis during this phase clinically important?
- It contributes to thrombotic risk in any coronary aneurysms, supporting continued antiplatelet therapy
- It indicates the child needs platelet transfusion
- It confirms treatment failure
- It is a sign of bone marrow malignancy
Correct answer: It contributes to thrombotic risk in any coronary aneurysms, supporting continued antiplatelet therapy
Contributing to thrombotic risk in coronary aneurysms and supporting continued antiplatelet therapy is correct because the reactive thrombocytosis typical of the subacute phase increases the chance of coronary thrombosis when aneurysms are present, which is why low-dose aspirin is continued. The high platelet count does not call for transfusion, does not signify treatment failure, and is a recognized phase of the illness rather than a marker of malignancy.
- A pediatric cardiologist is risk-stratifying a child recovered from Kawasaki disease who developed a large coronary artery aneurysm. Beyond aspirin, what additional therapy is most appropriate to reduce the risk of thrombosis in a giant coronary aneurysm?
- No additional therapy is ever warranted
- Systemic anticoagulation such as warfarin in addition to antiplatelet therapy
- High-dose corticosteroids indefinitely
- Routine coronary artery bypass at diagnosis
Correct answer: Systemic anticoagulation such as warfarin in addition to antiplatelet therapy
Systemic anticoagulation such as warfarin added to antiplatelet therapy is correct because giant coronary aneurysms carry a high thrombotic risk, so dual therapy combining anticoagulation with aspirin is used to prevent clot formation. Doing nothing leaves the child at major risk, indefinite high-dose steroids are not the standard chronic therapy, and bypass surgery is reserved for specific severe stenotic complications rather than performed routinely at diagnosis.
- A 2-year-old has had 6 days of fever, but only meets two of the classic clinical criteria. The clinician orders laboratory studies as part of evaluating possible incomplete Kawasaki disease. Which set of laboratory findings would best support proceeding toward treatment in this setting?
- Low CRP, low ESR, and a high lymphocyte count
- Normal inflammatory markers and normal platelets
- Elevated CRP and ESR with anemia, thrombocytosis, and elevated transaminases
- Eosinophilia with normal CRP
Correct answer: Elevated CRP and ESR with anemia, thrombocytosis, and elevated transaminases
Elevated CRP and ESR with anemia, thrombocytosis, and elevated transaminases is correct because supportive laboratory criteria for incomplete Kawasaki disease include high inflammatory markers along with findings such as anemia, elevated platelets after the first week, and abnormal liver enzymes, which help justify treatment to protect the coronary arteries. Low inflammatory markers, entirely normal studies, or isolated eosinophilia would not support the diagnosis.
- A 4-year-old is being evaluated for prolonged fever, and the team is distinguishing Kawasaki disease from a streptococcal infection causing scarlet fever. Which feature is more characteristic of Kawasaki disease than of scarlet fever?
- A sandpaper-textured rash with circumoral pallor
- A positive rapid strep test
- Tonsillar exudates with tender anterior cervical nodes
- Bilateral nonexudative bulbar conjunctival injection
Correct answer: Bilateral nonexudative bulbar conjunctival injection
Bilateral nonexudative bulbar conjunctival injection is correct because painless conjunctivitis without exudate is a hallmark of Kawasaki disease and is not a feature of scarlet fever. A sandpaper rash with circumoral pallor, a positive rapid strep test, and exudative pharyngitis all point toward streptococcal disease, helping separate the two conditions when fever and rash overlap.
- A child diagnosed with Kawasaki disease is being treated, and the team is reviewing the aspirin regimen. How does the role of aspirin typically change as the patient moves from the acute febrile phase into the convalescent phase?
- High anti-inflammatory dosing during fever transitions to low antiplatelet dosing afterward
- Aspirin is stopped entirely once fever resolves
- The dose is increased substantially after defervescence
- Aspirin is replaced by an antibiotic
Correct answer: High anti-inflammatory dosing during fever transitions to low antiplatelet dosing afterward
High anti-inflammatory dosing during fever transitioning to low antiplatelet dosing afterward is correct because aspirin is initially used at higher doses to reduce inflammation during the acute phase and then continued at low doses for its antiplatelet effect to lower coronary thrombosis risk. It is not stopped entirely at defervescence, not increased after fever resolves, and not replaced by an antibiotic, since Kawasaki disease is not a bacterial infection.
- A toddler with Kawasaki disease has persistent fever despite a first dose of IVIG and is identified as IVIG-resistant. The team considers adjunctive therapy to further reduce coronary risk. Besides a second dose of IVIG, which adjunctive treatment is most appropriate for refractory disease?
- Oral acyclovir
- Corticosteroids or a biologic agent such as infliximab
- Broad-spectrum antibiotics
- Intravenous diuretics
Correct answer: Corticosteroids or a biologic agent such as infliximab
Corticosteroids or a biologic agent such as infliximab is correct because refractory or IVIG-resistant Kawasaki disease may be treated with corticosteroids or TNF inhibitors in addition to or instead of a second IVIG dose to control inflammation and protect the coronaries. Antivirals and antibiotics do not treat this vasculitis, and diuretics do not address the underlying inflammatory process driving coronary injury.
- A clinician is counseling parents about the natural history of untreated Kawasaki disease. During which phase of the illness is the risk of coronary artery aneurysm formation greatest if appropriate treatment is delayed?
- The acute febrile phase within the first 10 days
- Many months after all symptoms resolve
- The subacute phase, typically the second to fourth weeks
- Only after the child reaches adulthood
Correct answer: The subacute phase, typically the second to fourth weeks
The subacute phase, typically the second to fourth weeks, is correct because coronary artery aneurysms most often develop during the subacute phase when fever subsides and platelets rise, which is why treatment within the first 10 days aims to prevent this. Aneurysms are not most likely to first form during the early acute febrile phase, many months later, or only in adulthood, although established aneurysms can have lifelong consequences.
- A 3-year-old being evaluated for prolonged fever has a clinical picture suspicious for Kawasaki disease, but the team must also weigh multisystem inflammatory syndrome in children given a recent viral exposure. Which feature, if prominent, would shift suspicion more toward Kawasaki disease in a young child?
- Marked gastrointestinal symptoms with shock predominating
- Prominent myocardial dysfunction with hypotension as the leading problem
- Older adolescent age with severe abdominal pain
- The classic constellation of conjunctivitis, mucositis, extremity changes, and rash in a child under 5
Correct answer: The classic constellation of conjunctivitis, mucositis, extremity changes, and rash in a child under 5
The classic constellation of conjunctivitis, mucositis, extremity changes, and rash in a child under 5 is correct because these mucocutaneous features in a young child are characteristic of Kawasaki disease, which classically affects children younger than 5. Predominant gastrointestinal symptoms with shock, leading myocardial dysfunction with hypotension, and older adolescent presentations are more typical of multisystem inflammatory syndrome in children.
- A child with Kawasaki disease has the diagnosis confirmed, and the parents ask whether their child can still receive scheduled live vaccines as planned. Considering the IVIG the child received, what is the most appropriate counseling about live vaccines such as MMR and varicella?
- Live vaccines should be deferred for about 11 months after high-dose IVIG
- Live vaccines should be given on the usual schedule without any delay
- Live vaccines are permanently contraindicated after Kawasaki disease
- Only inactivated vaccines can ever be given again
Correct answer: Live vaccines should be deferred for about 11 months after high-dose IVIG
Deferring live vaccines for about 11 months after high-dose IVIG is correct because the passively transferred antibodies in IVIG can blunt the immune response to live vaccines such as MMR and varicella, so these are postponed for roughly 11 months. Live vaccines are not given on the usual schedule right away, are not permanently contraindicated, and the child can eventually resume all routine vaccinations including live ones.
- A 4-year-old with classic Kawasaki disease is otherwise stable, and the team explains to the family why the heart, rather than another organ, is the focus of monitoring. What underlying pathologic process explains why the coronary arteries are the principal target in this disease?
- Deposition of immune complexes in the renal glomeruli
- A medium-vessel vasculitis with a predilection for the coronary arteries
- A primary cardiomyopathy unrelated to inflammation
- An infectious endocarditis seeding the valves
Correct answer: A medium-vessel vasculitis with a predilection for the coronary arteries
A medium-vessel vasculitis with a predilection for the coronary arteries is correct because Kawasaki disease is an acute vasculitis of medium-sized arteries that characteristically inflames the coronary arteries, leading to aneurysm formation. It is not primarily a glomerular immune-complex disease, not a noninflammatory primary cardiomyopathy, and not an infectious endocarditis, which is why coronary surveillance is central to management.
- A child being worked up for fever and rash is suspected of Kawasaki disease. Before settling on the diagnosis, the clinician confirms that the fever has persisted for the required minimum duration. What is the minimum duration of fever generally required to fulfill the classic clinical criteria?
- At least 24 hours
- At least 14 days
- At least 5 days
- At least 30 days
Correct answer: At least 5 days
At least 5 days is correct because classic Kawasaki disease is defined by fever lasting 5 or more days together with at least four of the five principal clinical features. A 24-hour fever is too brief to meet criteria, and 14 or 30 days are longer than required, so the 5-day threshold is the recognized minimum for diagnosis.
- A 5-day-old exclusively breastfed term infant presents with jaundice, weight loss of 11 percent from birth, and signs of dehydration with infrequent stooling. The bilirubin is unconjugated and elevated. Which mechanism best explains this presentation?
- Breast milk jaundice from a substance in mature milk
- Biliary atresia
- Crigler-Najjar syndrome type I
- Suboptimal intake (breastfeeding failure) jaundice from inadequate milk volume
Correct answer: Suboptimal intake (breastfeeding failure) jaundice from inadequate milk volume
Suboptimal intake (breastfeeding failure) jaundice is correct because in the first days of life inadequate milk intake leads to dehydration, reduced stooling, increased enterohepatic recirculation of bilirubin, and weight loss, distinguishing it from later breast milk jaundice in a thriving infant. Biliary atresia causes conjugated jaundice, and Crigler-Najjar is a rare enzyme disorder, neither of which fits this early dehydration-related picture.
- A newborn of East Asian descent develops marked jaundice on day 2 after an uncomplicated delivery. The infant is male, and during a recent illness the mother had eaten fava beans while breastfeeding. The smear shows bite cells and Heinz bodies. Which enzyme deficiency most likely underlies the hemolysis?
- Glucose-6-phosphate dehydrogenase deficiency
- Pyruvate kinase deficiency
- Hereditary spherocytosis
- Hexokinase deficiency
Correct answer: Glucose-6-phosphate dehydrogenase deficiency
Glucose-6-phosphate dehydrogenase deficiency is correct because this X-linked enzyme defect predisposes to oxidative hemolysis, classically triggered by certain exposures, with bite cells and Heinz bodies on the smear, and can cause significant neonatal hyperbilirubinemia. Pyruvate kinase and hexokinase deficiencies and hereditary spherocytosis cause hemolysis but do not produce the characteristic Heinz bodies and oxidative-trigger pattern seen here.
- A jaundiced term newborn is being assessed, and the clinician orders a fractionated bilirubin to separate conjugated from unconjugated hyperbilirubinemia. Why is this fractionation a critical early step in the evaluation?
- Both fractions are treated identically with phototherapy
- A conjugated (direct) fraction signals cholestasis and a different, often surgical, workup
- Only conjugated bilirubin causes kernicterus
- Fractionation determines the phototherapy wavelength
Correct answer: A conjugated (direct) fraction signals cholestasis and a different, often surgical, workup
A conjugated fraction signaling cholestasis and a different workup is correct because distinguishing conjugated from unconjugated hyperbilirubinemia changes the entire approach, since conjugated jaundice points to cholestatic or obstructive causes such as biliary atresia that need urgent, sometimes surgical, evaluation. The two fractions are not treated identically, it is unconjugated bilirubin that causes kernicterus, and fractionation does not set the light wavelength.
- A 4-day-old term infant is undergoing intensive phototherapy for unconjugated hyperbilirubinemia. The nursing staff asks how to optimize the therapy. Which intervention most improves the effectiveness of phototherapy?
- Wrapping the infant in extra blankets under the lights
- Keeping the lights far from the infant to avoid overheating
- Covering as much skin as possible and ensuring adequate hydration
- Limiting feeds to reduce bilirubin production
Correct answer: Covering as much skin as possible and ensuring adequate hydration
Covering as much skin as possible and ensuring adequate hydration is correct because phototherapy works by photoisomerizing bilirubin in exposed skin, so maximizing skin surface exposure and maintaining hydration to support bilirubin elimination improves efficacy. Bundling in blankets reduces skin exposure, placing lights too far weakens irradiance, and limiting feeds worsens dehydration and bilirubin clearance.
- A 36-hour-old infant has a transcutaneous bilirubin reading that is elevated and near the treatment threshold. The clinician decides to confirm with a serum measurement before acting. Why is a confirmatory total serum bilirubin appropriate when the transcutaneous value is high?
- Transcutaneous devices measure conjugated bilirubin only
- Serum testing is never needed once a transcutaneous value is obtained
- Transcutaneous values are always higher than true serum levels
- Transcutaneous readings can be less accurate at higher levels and after phototherapy, so serum confirms before treatment
Correct answer: Transcutaneous readings can be less accurate at higher levels and after phototherapy, so serum confirms before treatment
Transcutaneous readings being less accurate at higher levels so serum confirms before treatment is correct because transcutaneous bilirubinometry is a useful screen but can deviate from true serum values at higher concentrations and after phototherapy, so a serum total bilirubin is obtained before initiating or escalating treatment. Transcutaneous devices estimate total bilirubin, serum testing is appropriate at threshold, and transcutaneous values are not uniformly higher than serum.
- A term newborn develops jaundice and is found to have a positive direct antiglobulin test with the mother being Rh-negative and the infant Rh-positive. Beyond phototherapy and possible exchange transfusion, which agent administered to the mother during pregnancy is intended to prevent this immune hemolytic process in future pregnancies?
- Anti-D immune globulin (RhoGAM)
- Maternal corticosteroids
- Intravenous immunoglobulin to the infant only
- Maternal folate supplementation
Correct answer: Anti-D immune globulin (RhoGAM)
Anti-D immune globulin (RhoGAM) is correct because giving anti-D to an Rh-negative mother prevents maternal sensitization to Rh-positive fetal red cells, reducing the risk of Rh hemolytic disease in subsequent pregnancies. Maternal corticosteroids and folate do not prevent alloimmunization, and infant IVIG can reduce hemolysis acutely but does not prevent maternal sensitization for future pregnancies.
- A 3-week-old infant has persistent jaundice. Stool color is described as pale and clay-like and the urine appears dark. The direct bilirubin fraction is elevated. Why is prompt diagnosis especially time-sensitive in this scenario?
- Phototherapy must begin within hours to prevent kernicterus
- If biliary atresia is the cause, surgical hepatoportoenterostomy outcomes are best when performed early
- Delaying treatment allows the jaundice to resolve spontaneously
- The infant requires immediate exchange transfusion
Correct answer: If biliary atresia is the cause, surgical hepatoportoenterostomy outcomes are best when performed early
Surgical hepatoportoenterostomy outcomes being best when performed early is correct because conjugated hyperbilirubinemia with acholic stools strongly suggests biliary atresia, and the success of the Kasai procedure to restore bile drainage depends heavily on early intervention before irreversible liver damage. Phototherapy and exchange transfusion address unconjugated bilirubin, not cholestasis, and this jaundice will not resolve on its own.
- A clinician must decide whether a jaundiced term newborn meets criteria for exchange transfusion rather than continued phototherapy. Which scenario most strongly indicates the need for exchange transfusion?
- A bilirubin well below the phototherapy threshold
- Mild jaundice with normal neurologic exam and falling levels
- A bilirubin at the exchange threshold or signs of acute bilirubin encephalopathy despite intensive phototherapy
- Conjugated hyperbilirubinemia from cholestasis
Correct answer: A bilirubin at the exchange threshold or signs of acute bilirubin encephalopathy despite intensive phototherapy
A bilirubin at the exchange threshold or signs of acute bilirubin encephalopathy despite intensive phototherapy is correct because exchange transfusion is indicated when bilirubin reaches the exchange-level threshold or when neurologic signs of toxicity appear and phototherapy is failing, in order to rapidly remove bilirubin. Levels below the phototherapy threshold, mild improving jaundice, and conjugated hyperbilirubinemia do not call for exchange transfusion.
- A pediatrician is screening newborns before discharge to identify those at risk for significant hyperbilirubinemia. Besides plotting bilirubin on the hour-specific nomogram, which clinical factor most increases an individual newborn's risk for developing severe jaundice?
- Birth at 41 weeks with formula feeding and no family history
- An uncomplicated delivery with normal blood typing
- A reassuring transcutaneous reading on day 1
- A sibling who required phototherapy and visible jaundice in the first 24 hours
Correct answer: A sibling who required phototherapy and visible jaundice in the first 24 hours
A sibling who required phototherapy and visible jaundice in the first 24 hours is correct because a family history of a sibling needing phototherapy and early-onset jaundice are strong risk factors for significant hyperbilirubinemia. Late-term birth with formula feeding and no family history, an uncomplicated delivery with normal typing, and a reassuring early transcutaneous value all suggest lower rather than higher risk.
- A late-preterm infant born at 36 weeks is being assessed for jaundice. The clinician notes that gestational age affects how treatment thresholds are set. Compared with a term infant, how are phototherapy thresholds typically adjusted for a less mature infant?
- Thresholds are set lower because immature infants are more vulnerable to bilirubin neurotoxicity
- Thresholds are set higher because preterm infants tolerate bilirubin better
- Thresholds are identical regardless of gestational age
- Phototherapy is never used in late-preterm infants
Correct answer: Thresholds are set lower because immature infants are more vulnerable to bilirubin neurotoxicity
Thresholds being set lower because immature infants are more vulnerable to bilirubin neurotoxicity is correct because lower gestational age increases susceptibility to bilirubin-induced brain injury, so phototherapy is started at lower bilirubin levels in less mature infants. Preterm infants do not tolerate bilirubin better, thresholds are not identical across gestational ages, and phototherapy is certainly used when indicated in late-preterm infants.
- A breastfed 10-day-old infant who is thriving and gaining weight well has mild persistent unconjugated jaundice below treatment thresholds, and the workup for hemolysis and cholestasis is negative. The likely diagnosis is breast milk jaundice. What is the underlying mechanism most commonly proposed for this condition?
- Inadequate milk intake and dehydration
- Factors in breast milk that increase enterohepatic recirculation of bilirubin
- Immune hemolysis from maternal antibodies
- Obstruction of the biliary tree
Correct answer: Factors in breast milk that increase enterohepatic recirculation of bilirubin
Factors in breast milk that increase enterohepatic recirculation of bilirubin is correct because breast milk jaundice in a well-fed, thriving infant is attributed to components in mature milk that enhance reabsorption of bilirubin from the gut, prolonging unconjugated jaundice. Inadequate intake describes breastfeeding failure jaundice, immune hemolysis causes a different early pattern, and biliary obstruction produces conjugated, not unconjugated, jaundice.
- A newborn with significant unconjugated hyperbilirubinemia from ABO incompatibility is receiving intensive phototherapy, and the team considers an adjunct to reduce the rate of ongoing hemolysis. Which adjunctive therapy can be used in immune-mediated hemolytic hyperbilirubinemia to reduce the need for exchange transfusion?
- Oral ursodeoxycholic acid
- Sodium bicarbonate infusion
- Intravenous immunoglobulin
- Subcutaneous erythropoietin
Correct answer: Intravenous immunoglobulin
Intravenous immunoglobulin is correct because in immune-mediated hemolytic disease such as ABO or Rh incompatibility, IVIG can reduce antibody-mediated red cell destruction and may lower the need for exchange transfusion when bilirubin is rising despite intensive phototherapy. Ursodeoxycholic acid treats cholestasis, bicarbonate does not address hemolysis, and erythropoietin is not used acutely to control hemolytic hyperbilirubinemia.
- A 5-month-old former 30-week premature infant with chronic lung disease is in clinic before the winter respiratory season. The parents ask how to reduce the chance of severe RSV illness. Which preventive intervention is most appropriate for this high-risk infant?
- A course of prophylactic oral antibiotics
- Routine inhaled corticosteroids throughout the season
- Scheduled albuterol nebulizers
- Passive immunization with an RSV monoclonal antibody such as palivizumab or nirsevimab
Correct answer: Passive immunization with an RSV monoclonal antibody such as palivizumab or nirsevimab
Passive immunization with an RSV monoclonal antibody is correct because high-risk infants such as premature babies with chronic lung disease benefit from monoclonal antibody prophylaxis to reduce severe RSV bronchiolitis. Prophylactic antibiotics do not prevent a viral infection, and routine inhaled corticosteroids and scheduled bronchodilators are not effective preventive strategies for bronchiolitis.
- A 7-month-old is admitted with RSV bronchiolitis, and the parents ask why their baby was not started on an antibiotic. What is the best explanation for withholding antibiotics in typical bronchiolitis?
- Bronchiolitis is a viral illness, and antibiotics are reserved for a documented secondary bacterial infection
- Antibiotics are too expensive for routine use
- Antibiotics worsen wheezing
- Antibiotics are only given to children over 2 years old
Correct answer: Bronchiolitis is a viral illness, and antibiotics are reserved for a documented secondary bacterial infection
Bronchiolitis being viral with antibiotics reserved for documented secondary bacterial infection is correct because the illness is caused by viruses, most often RSV, so antibiotics do not help unless there is a proven bacterial complication. The reasoning is clinical appropriateness, not cost, antibiotics do not specifically worsen wheezing, and the age of the child is not the basis for withholding antibiotics in viral bronchiolitis.
- A 4-month-old with bronchiolitis is being assessed in the emergency department. Which clinical feature is the strongest indication that the infant should be admitted rather than discharged home?
- A runny nose for two days
- Persistent hypoxia and inability to maintain adequate oral intake from respiratory distress
- A single episode of coughing
- Mild intermittent wheezing with normal feeding and saturations
Correct answer: Persistent hypoxia and inability to maintain adequate oral intake from respiratory distress
Persistent hypoxia and inability to maintain adequate oral intake is correct because hypoxemia requiring oxygen and poor feeding due to respiratory distress are key reasons to admit an infant with bronchiolitis. A simple runny nose, an isolated cough, and mild wheezing in a well-feeding infant with normal oxygen saturations do not by themselves require hospitalization.
- A 3-month-old with bronchiolitis develops increasing work of breathing with grunting, nasal flaring, and apneic pauses. The team is concerned about impending respiratory failure. Which finding is the most ominous and indicates the need for escalation of respiratory support?
- Mild rhinorrhea
- Audible expiratory wheeze
- Recurrent apnea and rising carbon dioxide with fatigue
- A respiratory rate of 45 breaths per minute
Correct answer: Recurrent apnea and rising carbon dioxide with fatigue
Recurrent apnea and rising carbon dioxide with fatigue is correct because apneic episodes, hypercapnia, and exhaustion signal that the infant can no longer sustain the work of breathing and needs escalated support such as high-flow oxygen or ventilation. Rhinorrhea, an expiratory wheeze, and a respiratory rate of 45 in an infant are comparatively benign and do not indicate impending failure.
- A 6-month-old with bronchiolitis is being managed, and the resident wants to know whether a one-time trial of nebulized albuterol is warranted. What does current guidance say about routine bronchodilator use in bronchiolitis?
- Bronchodilators are recommended for all infants with bronchiolitis
- Bronchodilators should be given continuously around the clock
- Bronchodilators are the definitive treatment for RSV
- Routine bronchodilators are not recommended because they do not change the disease course
Correct answer: Routine bronchodilators are not recommended because they do not change the disease course
Routine bronchodilators not being recommended because they do not change the disease course is correct because evidence shows albuterol does not meaningfully improve outcomes in bronchiolitis, so it is not used routinely. Bronchodilators are not recommended for all infants, are not given continuously, and are not a definitive treatment, since bronchiolitis is managed primarily with supportive care.
- A 5-month-old hospitalized with bronchiolitis has thick nasal secretions that interfere with feeding and breathing through the nose. Which supportive measure is most appropriate to help this infant?
- Nasal saline drops with gentle bulb or nasopharyngeal suctioning as needed
- Routine deep tracheal suctioning every hour
- Systemic decongestant medication
- Chest physiotherapy on a fixed schedule
Correct answer: Nasal saline drops with gentle bulb or nasopharyngeal suctioning as needed
Nasal saline drops with gentle suctioning as needed is correct because clearing nasal secretions improves an obligate nasal breather's comfort and feeding without aggressive intervention. Routine deep suctioning can cause trauma and is not recommended, systemic decongestants are not used in infants, and scheduled chest physiotherapy has not been shown to benefit typical bronchiolitis.
- Parents of an infant recovering from bronchiolitis ask how long the cough is likely to last. What is the most accurate counseling about the expected course of cough in bronchiolitis?
- The cough resolves within 24 hours of starting supportive care
- Cough often persists for one to several weeks even as the child improves overall
- A persistent cough always indicates bacterial pneumonia
- Cough lasting more than 3 days requires antibiotics
Correct answer: Cough often persists for one to several weeks even as the child improves overall
Cough often persisting for one to several weeks even as the child improves is correct because the cough of bronchiolitis is typically the last symptom to resolve and can linger for weeks despite overall recovery. The cough does not vanish within a day, a lingering cough is not by itself evidence of bacterial pneumonia, and prolonged cough alone does not warrant antibiotics in an otherwise improving infant.
- A 2-month-old presents during peak RSV season with poor feeding and several witnessed apneic episodes, with only mild cough and wheeze. How should the prominence of apnea in this very young infant influence management?
- Apnea is benign in this age and warrants discharge
- Apnea indicates a primary cardiac arrhythmia
- Young infants with RSV can present with apnea, which warrants admission and monitoring
- Apnea means the infant should receive antibiotics
Correct answer: Young infants with RSV can present with apnea, which warrants admission and monitoring
Young infants with RSV presenting with apnea warranting admission and monitoring is correct because apnea can be an early and dangerous manifestation of RSV infection in young infants, sometimes preceding respiratory symptoms, and requires hospitalization for observation. Apnea in this setting is not benign, does not indicate a primary cardiac arrhythmia, and is not an indication for antibiotics.
- A 6-month-old with bronchiolitis is mildly tachypneic but well-hydrated, feeding adequately, and maintaining normal oxygen saturation on room air. The parents prefer to manage at home if safe. What is the most appropriate disposition and instruction?
- Admit for intravenous fluids
- Prescribe oral corticosteroids
- Start outpatient nebulized epinephrine
- Discharge home with supportive care, nasal suctioning, and clear return precautions
Correct answer: Discharge home with supportive care, nasal suctioning, and clear return precautions
Discharging home with supportive care, nasal suctioning, and return precautions is correct because a well-hydrated infant feeding adequately with normal saturations can be safely managed at home with guidance on warning signs that warrant return. Admission for IV fluids is unnecessary when feeding is adequate, and oral corticosteroids and home nebulized epinephrine are not recommended therapies for bronchiolitis.
- A medical student asks why supplemental oxygen, rather than a specific antiviral, is the mainstay for a hospitalized infant with RSV bronchiolitis. What best explains the supportive-care emphasis?
- Bronchiolitis is generally self-limited, so care targets oxygenation and hydration while the illness resolves
- A highly effective oral antiviral cures RSV bronchiolitis quickly
- Antivirals are withheld only because of cost
- Oxygen directly kills the RSV virus
Correct answer: Bronchiolitis is generally self-limited, so care targets oxygenation and hydration while the illness resolves
Bronchiolitis being self-limited with care targeting oxygenation and hydration is correct because there is no broadly effective antiviral cure for RSV bronchiolitis, so management supports the infant through the illness with oxygen for hypoxia and attention to hydration until it resolves. There is no quick oral antiviral cure, the rationale is not merely cost, and oxygen relieves hypoxia rather than killing the virus.
- A 4-month-old with bronchiolitis has mild dehydration and is feeding poorly because of tachypnea and respiratory distress. Oxygenation is acceptable. What is the most appropriate way to address the hydration concern?
- Force oral feeds despite the respiratory distress
- Provide smaller frequent feeds or use nasogastric or intravenous fluids if oral intake remains inadequate
- Restrict all fluids to reduce secretions
- Give a single large bolus of oral electrolyte solution rapidly
Correct answer: Provide smaller frequent feeds or use nasogastric or intravenous fluids if oral intake remains inadequate
Providing smaller frequent feeds or using nasogastric or intravenous fluids if oral intake remains inadequate is correct because tachypneic infants may not feed safely, so reduced-volume frequent feeds or supplemental nasogastric or intravenous hydration maintain fluid status while protecting the airway. Forcing oral feeds risks aspiration, fluid restriction worsens dehydration, and a rapid large oral bolus is not a safe approach in a distressed infant.
- A clinician is teaching about the typical age and seasonal pattern of bronchiolitis to help with anticipatory guidance. Which description best fits the classic epidemiology of bronchiolitis?
- Most common in school-age children during summer
- Most common in adolescents in spring
- Most common in infants under 2 years, peaking in fall and winter, usually due to RSV
- Equally distributed across all ages and seasons
Correct answer: Most common in infants under 2 years, peaking in fall and winter, usually due to RSV
Being most common in infants under 2 years, peaking in fall and winter, usually due to RSV, is correct because bronchiolitis predominantly affects young infants during the cooler-weather respiratory season and is most often caused by respiratory syncytial virus. It is not chiefly a summer illness of school-age children or a spring illness of adolescents, and it is not evenly spread across all ages and seasons.
- A 4-year-old is brought in sitting upright, leaning forward, drooling, with a muffled voice and high fever, and appears toxic and anxious. The parents are uncertain about his vaccination status. What is the most appropriate immediate action?
- Lay the child flat and obtain a lateral neck radiograph
- Perform an immediate throat examination with a tongue depressor
- Discharge with oral antibiotics
- Keep the child calm and arrange for airway management in a controlled setting by skilled personnel
Correct answer: Keep the child calm and arrange for airway management in a controlled setting by skilled personnel
Keeping the child calm and arranging controlled airway management is correct because this toxic child with drooling and the tripod position has suspected epiglottitis, and agitation or airway manipulation can precipitate complete obstruction, so the priority is securing the airway in a controlled setting. Laying the child flat, examining the throat with a depressor, and discharging on oral antibiotics all risk catastrophic airway loss.
- A pediatrician differentiates croup from epiglottitis in a child with stridor. Which causative organism is the classic cause of epiglottitis that has become much less common with routine immunization?
- Haemophilus influenzae type b
- Respiratory syncytial virus
- Parainfluenza virus
- Streptococcus pneumoniae
Correct answer: Haemophilus influenzae type b
Haemophilus influenzae type b is correct because it was the classic cause of epiglottitis, and widespread Hib vaccination has dramatically reduced its incidence. Parainfluenza virus is the typical cause of croup rather than epiglottitis, respiratory syncytial virus causes bronchiolitis, and while other bacteria can rarely cause epiglottitis now, Hib is the historically classic pathogen reduced by immunization.
- A 2-year-old presents at night with a barking cough, hoarse voice, and inspiratory stridor that worsens when he cries, with low-grade fever. He is not drooling and is not toxic-appearing. Which radiographic finding would support the suspected diagnosis?
- Thumbprint sign on lateral neck film
- Steeple sign (subglottic narrowing) on frontal neck film
- Widened mediastinum
- Bilateral hilar lymphadenopathy
Correct answer: Steeple sign (subglottic narrowing) on frontal neck film
The steeple sign on a frontal neck film is correct because subglottic narrowing producing a tapered, steeple-like airway is characteristic of croup, which fits this child's barky cough and stridor without toxicity. The thumbprint sign indicates a swollen epiglottis in epiglottitis, while a widened mediastinum and hilar lymphadenopathy are unrelated to this upper airway presentation.
- A 3-year-old with moderate croup has stridor at rest and mild retractions but is not cyanotic and is maintaining oxygenation. Which combination of treatments is most appropriate for moderate croup?
- Intravenous antibiotics and intubation
- Oral antihistamines and discharge
- Corticosteroids (such as dexamethasone) plus nebulized epinephrine for stridor at rest
- Nebulized albuterol only
Correct answer: Corticosteroids (such as dexamethasone) plus nebulized epinephrine for stridor at rest
Corticosteroids plus nebulized epinephrine for stridor at rest is correct because dexamethasone reduces airway inflammation in croup and nebulized epinephrine provides rapid temporary relief of stridor at rest in moderate to severe cases. Antibiotics and intubation are not first-line for viral croup, antihistamines do not treat it, and albuterol targets lower airway bronchospasm rather than the subglottic inflammation of croup.
- A toddler with a barky cough and mild stridor only when upset is examined and found to be comfortable, well-appearing, and feeding normally without stridor at rest. How should this mild croup be managed?
- Admit for observation and intravenous steroids
- Immediate nebulized epinephrine and intubation
- A course of oral antibiotics
- Single dose of oral corticosteroid and supportive care with discharge and return precautions
Correct answer: Single dose of oral corticosteroid and supportive care with discharge and return precautions
A single dose of oral corticosteroid with supportive care and discharge is correct because mild croup with stridor only when agitated and no stridor at rest is treated with a one-time corticosteroid such as dexamethasone and home supportive care, with instructions on warning signs. Admission with IV steroids and nebulized epinephrine with intubation are excessive for mild disease, and antibiotics do not treat this viral illness.
- A clinician is asked to summarize the key clinical contrast between croup and epiglottitis at the bedside. Which set of features best characterizes croup as opposed to epiglottitis?
- Gradual onset with a barking cough and inspiratory stridor, usually without drooling
- Toxic appearance, drooling, and a muffled voice
- Tripod positioning with rapid progression to airway obstruction
- High fever with refusal to swallow and a swollen epiglottis
Correct answer: Gradual onset with a barking cough and inspiratory stridor, usually without drooling
Gradual onset with a barking cough and inspiratory stridor usually without drooling is correct because croup typically develops over a day or two with the classic seal-like cough and stridor in a nontoxic child. A toxic appearance, drooling, muffled voice, tripod positioning, rapid obstruction, and a swollen epiglottis with refusal to swallow describe epiglottitis, which is the more emergent of the two conditions.
- A 4-year-old with suspected epiglottitis is in the emergency department. The team decides not to obtain imaging or perform venipuncture until the airway is secured. What is the rationale for deferring these interventions?
- Imaging and procedures are too slow to be useful
- Any agitation or supine positioning can precipitate complete airway obstruction
- The diagnosis is already excluded
- Radiographs are contraindicated in all children
Correct answer: Any agitation or supine positioning can precipitate complete airway obstruction
Agitation or supine positioning precipitating complete airway obstruction is correct because in suspected epiglottitis distressing the child or laying them flat can cause the swollen epiglottis to occlude the airway, so the airway is secured in a controlled setting before interventions that might upset the child. The deferral is not because imaging is merely slow, the diagnosis is not excluded, and radiographs are not universally contraindicated in children.
- A 3-year-old with croup has worsening stridor at rest, marked suprasternal and intercostal retractions, and is becoming agitated then quiet with decreasing air entry. What does the transition from agitation to lethargy with reduced air movement most concerningly indicate?
- The child is improving and can be discharged
- A simple need for additional oral fluids
- Impending respiratory failure requiring urgent airway intervention
- Resolution of the subglottic edema
Correct answer: Impending respiratory failure requiring urgent airway intervention
Impending respiratory failure requiring urgent airway intervention is correct because in severe croup, progression from agitation to lethargy with diminishing air entry signals fatigue and worsening obstruction, a sign of impending respiratory failure that requires immediate escalation. This change is not a sign of improvement, a simple hydration issue, or resolution of edema; it is an ominous indicator demanding urgent action.
- A pediatric resident is asked which condition is more likely to require emergent definitive airway control and rarely responds adequately to inhaled treatments alone. Between croup and epiglottitis, which is correct and why?
- Croup, because subglottic edema cannot be treated medically
- Croup, because it is bacterial
- Epiglottitis, because it always resolves with corticosteroids alone
- Epiglottitis, because of rapid supraglottic swelling that can fully obstruct the airway
Correct answer: Epiglottitis, because of rapid supraglottic swelling that can fully obstruct the airway
Epiglottitis because of rapid supraglottic swelling that can fully obstruct the airway is correct because epiglottitis can progress quickly to complete airway obstruction and frequently requires securing a definitive airway, unlike croup which usually responds to corticosteroids and supportive measures. Croup is viral and treatable medically, and epiglottitis does not reliably resolve with corticosteroids alone without airway control and antibiotics.
- A child diagnosed with epiglottitis has had the airway secured in the operating room. What is the most appropriate definitive medical treatment in addition to airway management?
- Intravenous antibiotics targeting likely bacterial pathogens
- Antiviral therapy
- Inhaled corticosteroids alone
- Observation without medication
Correct answer: Intravenous antibiotics targeting likely bacterial pathogens
Intravenous antibiotics targeting likely bacterial pathogens is correct because epiglottitis is a bacterial infection of the supraglottic structures, so after the airway is secured, intravenous antibiotics directed at organisms such as Haemophilus and other typical pathogens are essential. Antivirals do not treat this bacterial process, inhaled corticosteroids alone are insufficient, and observation without antibiotics would leave the infection untreated.
- A 2-year-old with recurrent croup-like episodes that occur abruptly at night and resolve quickly, without fever or preceding upper respiratory symptoms, is being evaluated. Which entity does this pattern most likely represent?
- Bacterial tracheitis
- Spasmodic (recurrent) croup
- Epiglottitis
- Foreign body aspiration
Correct answer: Spasmodic (recurrent) croup
Spasmodic croup is correct because recurrent, sudden nighttime episodes of barky cough and stridor that resolve quickly and occur without fever or a viral prodrome describe spasmodic croup, which is thought to have an allergic or hyperreactive component. Bacterial tracheitis and epiglottitis cause toxic, febrile illness, and foreign body aspiration typically presents with a sudden choking event rather than recurrent self-limited nighttime episodes.
- A toddler with viral croup is being monitored in the emergency department after receiving nebulized epinephrine for stridor at rest, and the stridor improves. Why is a period of observation important after epinephrine is administered for croup?
- Because epinephrine cures the underlying viral infection
- Because epinephrine causes delayed allergic reactions hours later
- Because the effect of epinephrine is temporary and stridor can return as it wears off
- Because the child must be intubated after every epinephrine dose
Correct answer: Because the effect of epinephrine is temporary and stridor can return as it wears off
The effect of epinephrine being temporary with possible return of stridor is correct because nebulized epinephrine provides rapid but short-lived relief, so children are observed to ensure symptoms do not rebound as the medication wears off before safe discharge. Epinephrine does not cure the viral infection, does not typically cause delayed allergic reactions in this context, and does not mandate intubation after each dose.
- A father reports that his 6-month-old can roll over both ways, sit with support, transfer objects between hands, and babble. He is concerned the baby is behind. How should the clinician interpret these findings?
- The infant is significantly delayed and needs urgent referral
- The infant should already be walking
- The infant should already be saying full sentences
- These skills are appropriate for a 6-month-old and reassurance is warranted
Correct answer: These skills are appropriate for a 6-month-old and reassurance is warranted
These skills being appropriate for a 6-month-old with reassurance warranted is correct because rolling both ways, sitting with support, transferring objects, and babbling are expected around 6 months of age. The infant is not delayed, walking and full sentences are far beyond what is expected at this age, so reassurance about normal development is the appropriate response.
- A 4-year-old is brought in, and the clinician assesses fine motor and cognitive milestones. Which task is a typically developing 4-year-old most expected to accomplish?
- Copy a cross and hop on one foot
- Copy a triangle and tie shoelaces independently
- Draw a six-part person and read simple words
- Stack two blocks and use a pincer grasp for the first time
Correct answer: Copy a cross and hop on one foot
Copying a cross and hopping on one foot is correct because these motor skills are typical for a 4-year-old. Copying a triangle and tying shoelaces are later preschool-to-school-age skills, drawing a detailed person and reading words are beyond 4 years, and stacking only two blocks with an emerging pincer grasp reflects a much younger infant, so the cross and one-foot hopping fit a 4-year-old.
- A 9-month-old at a well visit is being evaluated for red-flag findings. Which observation at this age should prompt concern and further developmental evaluation?
- Babbling consonant sounds
- Inability to sit without support and absence of babbling
- Reaching for toys with either hand
- Showing stranger anxiety
Correct answer: Inability to sit without support and absence of babbling
Inability to sit without support and absence of babbling is correct because by 9 months most infants sit independently and babble, so lacking these skills is a developmental red flag warranting evaluation. Babbling consonant sounds and reaching for toys are normal at this age, and stranger anxiety is an expected social development around this time, not a warning sign.
- An 18-month-old is brought in, and the clinician focuses on social and communication milestones. Which finding at 18 months would be most concerning for a possible developmental disorder requiring further evaluation?
- Using several single words and pointing to show interest
- Walking independently
- No single words and no pointing or gesturing to communicate
- Imitating household activities
Correct answer: No single words and no pointing or gesturing to communicate
No single words and no pointing or gesturing is correct because by 18 months children typically have several words and use gestures such as pointing to share interest, so their absence is a significant red flag for language or social-communication delay. Using single words with pointing, walking independently, and imitating household tasks are all expected milestones rather than warning signs.
- A 5-year-old at a kindergarten readiness visit is being assessed. Which combination of skills is most consistent with typical development at age 5?
- Speaks in two-word phrases and walks up stairs with help
- Babbles without words and sits with support
- Reads paragraphs fluently and writes in cursive
- Speaks in full sentences, counts to ten, and draws a person with several body parts
Correct answer: Speaks in full sentences, counts to ten, and draws a person with several body parts
Speaking in full sentences, counting to ten, and drawing a person with several body parts is correct because these language, cognitive, and fine motor skills are typical of a 5-year-old. Two-word phrases with assisted stair climbing fit a much younger toddler, babbling without words reflects infancy, and fluent paragraph reading with cursive writing exceeds the expected abilities of a typical 5-year-old.
- A 2-year-old previously developing normally has, over several months, lost the ability to use words she once spoke and now avoids eye contact and no longer engages socially. What does this regression most importantly warrant?
- Prompt evaluation for autism spectrum disorder or a neurologic condition
- Reassurance that variation is normal
- Waiting until age 4 to reassess
- Routine iron supplementation only
Correct answer: Prompt evaluation for autism spectrum disorder or a neurologic condition
Prompt evaluation for autism spectrum disorder or a neurologic condition is correct because loss of previously acquired language and social skills is a significant red flag that requires timely assessment for autism spectrum disorder or another neurodevelopmental or neurologic process. Reassurance, delaying evaluation until age 4, and empiric iron supplementation alone would inappropriately overlook the regression.
- A clinician explains gross motor milestones to a parent. By approximately what age should a typically developing child be walking independently, such that failure to do so warrants evaluation?
- By 9 months
- By about 18 months
- By 3 years
- By 4 years
Correct answer: By about 18 months
By about 18 months is correct because most children walk independently by 12 to 15 months, and not walking by 18 months is a recognized threshold that warrants developmental evaluation. Expecting independent walking by 9 months is too early, while 3 or 4 years is far too late as a cutoff for concern about gross motor delay.
- A 12-month-old is evaluated at a well visit. Which fine motor skill is most appropriate to expect a typically developing 12-month-old to demonstrate?
- Building a tower of six blocks
- Copying a circle
- A mature pincer grasp to pick up small objects
- Cutting with scissors
Correct answer: A mature pincer grasp to pick up small objects
A mature pincer grasp to pick up small objects is correct because by around 12 months infants typically develop a refined pincer grasp using the thumb and index finger. Building a six-block tower, copying a circle, and cutting with scissors are later toddler and preschool skills that exceed what is expected of a 1-year-old.
- A 4-month-old at a well visit is being checked for expected milestones. Which set of findings best represents typical development at 4 months?
- Walking and saying single words
- Pincer grasp and crawling
- Speaking in two-word phrases
- Good head control, social smiling, and beginning to reach for objects
Correct answer: Good head control, social smiling, and beginning to reach for objects
Good head control, social smiling, and beginning to reach for objects is correct because by about 4 months infants steady their head, smile responsively, and start reaching. Walking with single words, a pincer grasp with crawling, and two-word phrases are all much later milestones, so the head control, social smile, and reaching pattern fits a 4-month-old.
- A 30-month-old uses only about 20 words, does not combine words, and is difficult for the family to understand. The parents wonder if this will resolve on its own. What is the most appropriate next step?
- Refer for hearing evaluation and speech-language assessment
- Reassure and recheck at age 5
- Begin medication for speech
- Restrict screen time as the sole intervention
Correct answer: Refer for hearing evaluation and speech-language assessment
Referring for hearing evaluation and speech-language assessment is correct because limited vocabulary, lack of word combinations, and poor intelligibility at 30 months represent a language delay that warrants checking hearing and a formal speech-language evaluation to guide early intervention. Waiting until age 5, prescribing medication, or relying only on screen-time changes would delay needed assessment of a potential underlying cause.
- A clinician discusses hand preference with the parents of an 8-month-old who reaches equally with both hands. The parents ask when a clear hand preference normally emerges and when an early preference is concerning. What is the most accurate statement?
- Hand preference is normally established by 6 months
- A persistent strong hand preference before about 1 to 2 years can suggest a problem on the nonpreferred side
- Hand preference never develops in childhood
- An early hand preference at 8 months is always normal
Correct answer: A persistent strong hand preference before about 1 to 2 years can suggest a problem on the nonpreferred side
A persistent strong hand preference before about 1 to 2 years suggesting a problem on the nonpreferred side is correct because true handedness typically emerges later in toddlerhood, so an early fixed preference can indicate relative weakness or impairment of the opposite limb and merits evaluation. Hand preference is not normally set by 6 months, it does develop in childhood, and an early strong preference is not automatically normal.
- A 2-month-old infant is at a well visit. Which social-emotional milestone is most appropriate to expect at this age?
- Stranger anxiety
- Playing peekaboo
- A responsive social smile
- Waving bye-bye
Correct answer: A responsive social smile
A responsive social smile is correct because the social smile in response to a caregiver typically emerges around 2 months and is an important early social milestone. Stranger anxiety, playing peekaboo, and waving bye-bye are later social skills that appear in the second half of the first year, well beyond what is expected at 2 months.
- A 6-month-old presents for a well visit with a mild runny nose and a temperature of 37.6 C but is otherwise well and feeding normally. The parents ask whether the scheduled vaccines should be postponed because of the cold. What is the most appropriate response?
- Postpone all vaccines until the cold completely resolves
- Give only half doses of each vaccine
- Defer vaccines for one month
- Administer the scheduled vaccines, since mild illness is not a contraindication
Correct answer: Administer the scheduled vaccines, since mild illness is not a contraindication
Administering the scheduled vaccines is correct because mild illness with or without low-grade fever is not a contraindication to vaccination, and deferring would risk missed protection and incomplete schedules. Postponing for a minor cold, giving partial doses, or delaying a month are all inappropriate, since the child can safely be vaccinated during a mild upper respiratory illness.
- A 12-month-old is due for the MMR vaccine, but the parents report the child has a known severe allergy. Which history would be a true contraindication to giving the MMR vaccine?
- A documented severe anaphylactic reaction to a previous dose or vaccine component
- A mild local reaction at a prior injection site
- A family history of vaccine reactions
- A current mild ear infection
Correct answer: A documented severe anaphylactic reaction to a previous dose or vaccine component
A documented severe anaphylactic reaction to a previous dose or a vaccine component is correct because anaphylaxis to a prior dose or to a component is a genuine contraindication to that vaccine. A mild local reaction, a family history of reactions, and a current mild illness such as an ear infection are not contraindications, so they would not preclude administering MMR.
- A child with a known significant primary immunodeficiency is being reviewed for routine immunizations. Which type of vaccine is generally contraindicated in a severely immunocompromised child?
- Inactivated influenza vaccine
- Live attenuated vaccines such as MMR and varicella
- Tetanus toxoid
- Conjugate pneumococcal vaccine
Correct answer: Live attenuated vaccines such as MMR and varicella
Live attenuated vaccines such as MMR and varicella is correct because in severely immunocompromised children the weakened live organisms can cause disease, so live vaccines are generally contraindicated. Inactivated influenza vaccine, tetanus toxoid, and conjugate pneumococcal vaccine are not live and are typically safe and recommended in immunocompromised children, who especially benefit from protection against these infections.
- A 4-month-old infant born prematurely at 30 weeks is being seen for vaccinations. The parents ask whether prematurity means the schedule should be delayed. How should premature infants generally be vaccinated?
- Delay all vaccines until the corrected age reaches term
- Give reduced doses because of low birth weight
- Vaccinate according to chronological age with the usual schedule and doses
- Skip the primary series and start at 1 year
Correct answer: Vaccinate according to chronological age with the usual schedule and doses
Vaccinating according to chronological age with the usual schedule and doses is correct because, with few exceptions, premature infants are immunized based on their chronological age using standard doses, since delaying leaves them vulnerable to vaccine-preventable diseases. Waiting for corrected term age, reducing doses for low birth weight, or skipping the primary series would inappropriately under-protect a high-risk infant.
- A child comes in having missed several vaccines and is now behind schedule. The clinician plans catch-up immunizations. What is the most appropriate approach to a child who is behind on the recommended schedule?
- Restart the entire series from the beginning
- Wait until the next birthday to give any vaccines
- Give all missed vaccines as a single combined injection regardless of spacing
- Resume the schedule using catch-up guidance without restarting completed doses
Correct answer: Resume the schedule using catch-up guidance without restarting completed doses
Resuming the schedule using catch-up guidance without restarting is correct because previously administered valid doses count, so catch-up vaccination continues from where the child left off using recommended minimum intervals rather than starting over. Restarting the whole series, waiting for the next birthday, or ignoring required spacing intervals are all incorrect approaches to a child who has fallen behind.
- A pediatrician is counseling about the timing of the first hepatitis B vaccine dose, which is recommended at birth. What is the primary rationale for administering the hepatitis B vaccine to newborns before hospital discharge?
- To prevent perinatal transmission of hepatitis B and provide early protection
- To treat an active hepatitis B infection in the newborn
- Because the vaccine only works in the first day of life
- To replace the need for any later doses
Correct answer: To prevent perinatal transmission of hepatitis B and provide early protection
Preventing perinatal transmission and providing early protection is correct because giving the birth dose of hepatitis B vaccine helps prevent mother-to-child transmission, which can lead to chronic infection, and begins protection early. The vaccine is preventive rather than a treatment for active infection, it is not effective only on the first day, and the birth dose is the first of a series, not a replacement for later doses.
- A clinician reviews the routine adolescent immunizations to give at the 11- to 12-year visit. Which vaccine is specifically recommended to begin at this age to prevent certain cancers and genital infections?
- Rotavirus vaccine
- Human papillomavirus (HPV) vaccine
- Hib vaccine
- Birth-dose hepatitis B vaccine
Correct answer: Human papillomavirus (HPV) vaccine
Human papillomavirus vaccine is correct because the HPV series is recommended to start at the 11- to 12-year visit to prevent HPV-related cancers and genital infections. Rotavirus and Hib vaccines are part of the infant schedule, and the birth dose of hepatitis B is given to newborns, so HPV is the adolescent vaccine specifically introduced at this visit.
- A parent worries about giving multiple vaccines at one visit, fearing it will overwhelm the child's immune system. What is the most accurate counseling regarding administering several vaccines simultaneously?
- Multiple simultaneous vaccines overwhelm the immune system and should be spaced months apart
- Vaccines must always be given one at a time, one per month
- The immune system safely handles multiple vaccines at once, and simultaneous administration is recommended
- Combining vaccines reduces their effectiveness
Correct answer: The immune system safely handles multiple vaccines at once, and simultaneous administration is recommended
The immune system safely handling multiple vaccines at once is correct because children encounter countless antigens daily, and giving recommended vaccines together is safe, effective, and improves timely completion of the schedule. Spacing them months apart, limiting to one per month, or claiming combination reduces effectiveness are misconceptions that would delay protection without benefit.
- A 1-year-old recovering from a moderate acute illness with high fever is due for vaccines. The clinician must decide whether to vaccinate now. How should moderate to severe acute illness influence the decision to vaccinate?
- Vaccinate immediately regardless of illness severity
- Never vaccinate a child who has been ill in the past month
- Reduce the dose because of the illness
- Defer vaccination until the moderate to severe acute illness improves, then vaccinate
Correct answer: Defer vaccination until the moderate to severe acute illness improves, then vaccinate
Deferring vaccination until the moderate to severe acute illness improves is correct because moderate to severe acute illness is a precaution, so vaccines are postponed briefly until recovery to avoid attributing illness progression to the vaccine and to ensure an optimal response, whereas mild illness is not a reason to defer. Vaccinating immediately during significant illness, refusing vaccines for a month after any illness, or reducing the dose are not correct.
- A clinician is verifying contraindications before giving the live attenuated MMR vaccine to a toddler. Besides severe immunocompromise and prior anaphylaxis, which additional situation is a contraindication or precaution for this live vaccine?
- Pregnancy in an adolescent patient
- A mild cough
- A history of eczema
- A family member who is elderly
Correct answer: Pregnancy in an adolescent patient
Pregnancy in an adolescent patient is correct because live attenuated vaccines such as MMR are contraindicated during pregnancy due to theoretical risk to the fetus. A mild cough, a history of eczema, and having an elderly household contact are not contraindications to MMR, so pregnancy is the relevant situation among these to avoid administering the live vaccine.
- A pediatrician is counseling about the rotavirus vaccine, which is an oral live vaccine given in infancy. Which condition in an infant's history is an important contraindication to the rotavirus vaccine?
- A prior mild upper respiratory infection
- A history of intussusception
- A sibling who received the vaccine
- Breastfeeding
Correct answer: A history of intussusception
A history of intussusception is correct because a prior episode of intussusception is a contraindication to the rotavirus vaccine, which carries a small risk of intussusception. A previous mild respiratory infection, having a vaccinated sibling, and breastfeeding are not contraindications, so a personal history of intussusception is the key reason to avoid giving the rotavirus vaccine.
- A parent reports that after a previous vaccine their adolescent fainted briefly but recovered fully, and they ask how to prevent injury at the next visit. What is the most appropriate preventive measure for vaccine-associated syncope in an adolescent?
- Withhold all future vaccines permanently
- Give only oral vaccines from now on
- Administer the vaccine with the patient seated and observe for about 15 minutes afterward
- Provide deep sedation before vaccination
Correct answer: Administer the vaccine with the patient seated and observe for about 15 minutes afterward
Administering the vaccine with the patient seated and observing for about 15 minutes is correct because syncope can occur after vaccination, especially in adolescents, so vaccinating while seated and observing afterward prevents fall-related injury without withholding needed vaccines. Permanently withholding vaccines, switching only to oral vaccines, and using deep sedation are unnecessary and inappropriate responses to a simple vasovagal faint.
- A 4-month-old whose weight has crossed downward through two major percentile lines is admitted for evaluation of failure to thrive. After a careful history, exam, and limited screening labs, the team plans the next diagnostic step. What is generally the most informative initial approach in evaluating failure to thrive?
- An extensive panel of laboratory and genetic tests up front
- Immediate endoscopy
- Empiric hospitalization for all infants without history-taking
- A thorough feeding history, dietary assessment, and observation of feeding
Correct answer: A thorough feeding history, dietary assessment, and observation of feeding
A thorough feeding history, dietary assessment, and observation of feeding is correct because most failure to thrive is related to inadequate caloric intake, so a detailed nutritional and feeding evaluation is the highest-yield first step and guides any further testing. Broad laboratory and genetic panels, immediate endoscopy, or reflexive hospitalization without history are not the appropriate initial approach to most affected infants.
- A 3-month-old with poor weight gain is admitted, and during hospitalization the infant is offered adequate calories and gains weight steadily, with caregivers appearing disengaged at home. What does the catch-up growth during structured feeding most strongly suggest?
- Inadequate caloric intake in the home environment (often nonorganic causes)
- An underlying malabsorptive disorder
- A congenital metabolic disease
- A genetic syndrome
Correct answer: Inadequate caloric intake in the home environment (often nonorganic causes)
Inadequate caloric intake in the home environment is correct because robust weight gain when adequate calories are reliably provided points to insufficient intake at home rather than an organic disease impairing absorption or metabolism. A malabsorptive disorder, a metabolic disease, or a genetic syndrome would generally not be corrected simply by ensuring adequate feeding during a hospital stay.
- A 9-month-old with failure to thrive has chronic foul-smelling, greasy, bulky stools and recurrent respiratory infections. Which underlying organic diagnosis should be most strongly considered?
- Cow's milk protein allergy
- Cystic fibrosis
- Simple constipation
- Lactose intolerance alone
Correct answer: Cystic fibrosis
Cystic fibrosis is correct because the combination of failure to thrive, steatorrhea from pancreatic insufficiency, and recurrent respiratory infections is characteristic of cystic fibrosis. Cow's milk protein allergy and lactose intolerance do not typically cause recurrent respiratory infections, and simple constipation does not produce greasy, malabsorptive stools with poor growth, making cystic fibrosis the leading concern.
- A 1-year-old with failure to thrive has frequent vomiting, back-arching during feeds, and irritability when lying flat after eating. Which contributing cause should be evaluated as a possible reason for inadequate intake?
- Hypothyroidism
- Diabetes insipidus
- Gastroesophageal reflux disease
- Iron deficiency without other symptoms
Correct answer: Gastroesophageal reflux disease
Gastroesophageal reflux disease is correct because vomiting, arching, and discomfort with feeds and lying flat suggest reflux that can limit intake and contribute to poor weight gain. Hypothyroidism and diabetes insipidus do not classically present with this feeding-related pattern, and isolated iron deficiency would not explain the regurgitation and feeding aversion seen here.
- A 13-month-old with failure to thrive has chronic diarrhea, abdominal distension, and irritability that began around the time grains were introduced into the diet. Which diagnosis best fits this temporal pattern?
- Pyloric stenosis
- Appendicitis
- Hirschsprung disease
- Celiac disease
Correct answer: Celiac disease
Celiac disease is correct because failure to thrive with chronic diarrhea and abdominal distension that began after introducing gluten-containing grains is characteristic of celiac disease, an immune reaction to gluten causing malabsorption. Pyloric stenosis presents in early infancy with vomiting, appendicitis is an acute surgical illness, and Hirschsprung disease typically presents with constipation, so the gluten-related timing points to celiac disease.
- A 10-month-old is referred for failure to thrive, and the clinician distinguishes between organic and nonorganic causes. Which finding would point more toward an organic cause requiring further medical workup?
- Persistent poor growth despite documented adequate caloric intake plus chronic vomiting and diarrhea
- Weight that improves promptly with structured feeding alone
- A chaotic feeding routine with diluted formula
- Caregiver misunderstanding of feeding amounts
Correct answer: Persistent poor growth despite documented adequate caloric intake plus chronic vomiting and diarrhea
Persistent poor growth despite documented adequate intake plus chronic vomiting and diarrhea is correct because failure to gain weight even when calories are clearly adequate, along with chronic gastrointestinal symptoms, suggests an organic disease affecting digestion or absorption. Improvement with feeding alone, a chaotic feeding routine, diluted formula, and caregiver misunderstanding all point toward nonorganic causes related to inadequate intake.
- A 9-month-old infant with failure to thrive is found, after evaluation, to have a pattern in which weight is most affected, with length and head circumference relatively preserved. What does this growth pattern most strongly suggest?
- A genetic short-stature syndrome
- Inadequate caloric intake or undernutrition
- An intrauterine infection
- Primary microcephaly
Correct answer: Inadequate caloric intake or undernutrition
Inadequate caloric intake or undernutrition is correct because in caloric deprivation weight typically falls first and is most affected, while length and head circumference are relatively spared until malnutrition is prolonged. A genetic short-stature syndrome would affect length prominently, an intrauterine infection and primary microcephaly would prominently affect head growth, so the weight-predominant pattern points to undernutrition.
- A 10-month-old with failure to thrive is suspected of having inadequate intake due to improperly prepared formula. On history, the caregiver describes adding extra water to make the formula last longer. How does this practice contribute to failure to thrive?
- It causes an allergic reaction
- It introduces gluten prematurely
- It dilutes the formula, reducing caloric density and risking hyponatremia
- It increases the risk of intussusception
Correct answer: It dilutes the formula, reducing caloric density and risking hyponatremia
Diluting the formula and reducing caloric density with risk of hyponatremia is correct because over-dilution lowers the calories the infant receives and can cause dangerous water intoxication with low sodium, both contributing to poor growth. Improper dilution does not cause an allergic reaction, introduce gluten, or increase intussusception risk, so the key harm is reduced caloric intake and electrolyte disturbance.
- A 6-month-old with failure to thrive has poor weight gain despite a reported good appetite and adequate intake, along with frequent loose stools and a distended abdomen. Which broad category of cause is most consistent with eating well yet failing to gain weight?
- Inadequate caloric intake
- Caregiver neglect of feeding
- Excessive sleeping
- Increased caloric losses or malabsorption
Correct answer: Increased caloric losses or malabsorption
Increased caloric losses or malabsorption is correct because an infant who eats adequately yet fails to gain weight, especially with diarrhea and distension, is likely losing or failing to absorb calories, as in malabsorptive or gastrointestinal disorders. Inadequate intake and feeding neglect do not fit a good appetite with adequate intake, and excessive sleeping is not a primary mechanism for this malabsorptive presentation.
- A clinician evaluating an infant for failure to thrive plots serial measurements and considers the three broad mechanistic categories. Which set correctly describes the three primary mechanisms of failure to thrive?
- Inadequate intake, increased losses or malabsorption, and increased metabolic demand
- Only genetic causes, infections, and trauma
- Only psychiatric, allergic, and toxic causes
- Only endocrine, renal, and pulmonary causes
Correct answer: Inadequate intake, increased losses or malabsorption, and increased metabolic demand
Inadequate intake, increased losses or malabsorption, and increased metabolic demand is correct because failure to thrive is conceptually organized into insufficient caloric intake, excessive losses or malabsorption, and increased energy expenditure or demand, which guides a focused evaluation. The other groupings omit these core mechanisms and instead list narrow or unrelated categories that do not capture the standard framework for failure to thrive.
- A 10-month-old with failure to thrive has recurrent infections, chronic diarrhea, and poor growth, and the team is concerned about an underlying immune or systemic disorder. After the initial history, exam, and dietary assessment, what is the most appropriate next step?
- Immediately attribute the failure to thrive to poor feeding without further testing
- Pursue targeted laboratory evaluation guided by the clinical findings
- Discharge with reassurance
- Begin empiric antibiotics indefinitely
Correct answer: Pursue targeted laboratory evaluation guided by the clinical findings
Pursuing targeted laboratory evaluation guided by clinical findings is correct because when the history and exam suggest a possible organic cause such as immune dysfunction or chronic infection, focused investigations directed by those clues are appropriate rather than broad random testing or none at all. Attributing it to poor feeding without testing, discharging with reassurance, or starting indefinite antibiotics would be inappropriate given the concerning features.
- A 12-month-old with failure to thrive is being managed with a goal of catch-up growth. What is the central principle of nutritional rehabilitation for an undernourished infant with failure to thrive?
- Restrict calories to avoid overfeeding
- Eliminate all fats from the diet
- Provide increased caloric intake above normal maintenance to achieve catch-up growth, with monitoring
- Feed only clear liquids until weight normalizes
Correct answer: Provide increased caloric intake above normal maintenance to achieve catch-up growth, with monitoring
Providing increased caloric intake above normal maintenance to achieve catch-up growth with monitoring is correct because undernourished infants require more than usual maintenance calories to recover lost growth, with careful follow-up of weight gain and electrolytes. Restricting calories, eliminating dietary fat, and feeding only clear liquids would worsen undernutrition and fail to support the catch-up growth that defines successful treatment.
- A 10-month-old has confirmed intussusception that is successfully reduced by air enema. The parents are counseled before discharge about the small possibility of recurrence. Over what time frame does recurrence after successful reduction most commonly occur?
- Only after several months
- Only in adolescence
- Never after a successful reduction
- Within the first day or two after reduction
Correct answer: Within the first day or two after reduction
Within the first day or two after reduction is correct because recurrent intussusception, while uncommon, most often happens in the early period following a successful nonoperative reduction, which is why a brief observation is recommended. Recurrence is not limited to months later or to adolescence, and it can occur despite an initially successful reduction, so vigilance during the early post-reduction window is appropriate.
- A toddler presents with colicky abdominal pain and a stool resembling currant jelly. The clinician explains to trainees that 'currant-jelly stool' is a relatively late sign. What does the currant-jelly appearance of the stool represent pathophysiologically?
- A mixture of blood and mucus from ischemic, sloughing bowel mucosa
- Pure fresh arterial blood from a vascular malformation
- Undigested fat from malabsorption
- Bile-stained mucus from biliary obstruction
Correct answer: A mixture of blood and mucus from ischemic, sloughing bowel mucosa
A mixture of blood and mucus from ischemic, sloughing bowel mucosa is correct because as the telescoped bowel becomes congested and ischemic, it sheds blood and mucus that combine to give the characteristic currant-jelly stool, typically a later finding. It is not pure arterial blood, undigested fat, or bile-stained mucus, so the blood-and-mucus mixture from mucosal ischemia best explains the appearance.
- A 5-week-old with weeks of vomiting is found to have pyloric stenosis. The team is asked to predict the typical pattern of vomiting in this condition. Which description best matches the expected vomiting in hypertrophic pyloric stenosis?
- Bilious and present from the first day of life
- Progressively forceful, projectile, and nonbilious right after feeds
- Only at night and associated with fever
- Bloody and associated with diarrhea
Correct answer: Progressively forceful, projectile, and nonbilious right after feeds
Progressively forceful, projectile, and nonbilious right after feeds is correct because pyloric stenosis classically causes vomiting that worsens over weeks, becomes projectile, occurs soon after feeding, and lacks bile because the obstruction is proximal to the bile duct entry. Bilious vomiting from birth, nocturnal febrile vomiting, and bloody vomiting with diarrhea describe other conditions and do not fit the characteristic pattern of pyloric stenosis.
- A 4-week-old infant is suspected of having pyloric stenosis. The clinician explains why surgery is delayed until metabolic correction is achieved rather than performed emergently. What best summarizes the timing principle for pyloromyotomy?
- Pyloromyotomy must be performed within one hour of diagnosis
- Surgery should be delayed for several weeks regardless of status
- Pyloromyotomy is elective relative to first correcting dehydration and electrolyte abnormalities
- Surgery is contraindicated until the infant is 6 months old
Correct answer: Pyloromyotomy is elective relative to first correcting dehydration and electrolyte abnormalities
Pyloromyotomy being elective relative to first correcting dehydration and electrolytes is correct because the operation is not an emergency, and operating on a dehydrated, alkalotic, hypokalemic infant increases anesthetic risk, so fluids and electrolytes are corrected first. It does not need to be done within an hour, it is not deferred for weeks once the infant is stabilized, and it is not withheld until 6 months of age.
- A 13-month-old is brought in after a brief generalized seizure during a fever, and the parents are extremely frightened. After confirming a simple febrile seizure with a normal exam, what is the most important component of management for the family?
- Immediate prescription of daily antiepileptic medication
- Routine admission for cardiac monitoring
- Mandatory genetic counseling referral
- Detailed parental education and reassurance about the benign nature and first aid
Correct answer: Detailed parental education and reassurance about the benign nature and first aid
Detailed parental education and reassurance about the benign nature and first aid is correct because, beyond identifying the source of fever, the cornerstone of managing a simple febrile seizure is counseling families about the favorable prognosis, low epilepsy risk, and safe home seizure first aid. Daily antiepileptics, routine admission for cardiac monitoring, and mandatory genetic counseling are not indicated for an uncomplicated simple febrile seizure.
- A previously healthy 2-year-old has a febrile seizure, and the clinician must decide whether the presentation fits the benign simple category or warrants more concern. Which single feature would, by itself, reclassify the event as a complex febrile seizure?
- A focal component such as twitching limited to one side
- A temperature above 39 C
- Occurrence during a viral upper respiratory infection
- A brief postictal period of sleepiness
Correct answer: A focal component such as twitching limited to one side
A focal component such as one-sided twitching is correct because focality, prolonged duration over about 15 minutes, or recurrence within 24 hours each define a complex febrile seizure. A high temperature, a viral illness as the fever source, and a brief period of postictal drowsiness are all common features of simple febrile seizures and do not by themselves make the event complex.
- A child is diagnosed with Kawasaki disease and the parents ask whether their child will recover and how the heart will be followed. What is the most accurate statement about the overall prognosis when treatment is given promptly?
- The disease is uniformly fatal even with treatment
- Most children recover fully, especially when IVIG is given early, with low risk of coronary complications
- All children develop permanent heart failure
- Recovery is impossible without surgery
Correct answer: Most children recover fully, especially when IVIG is given early, with low risk of coronary complications
Most children recovering fully with early IVIG and low coronary risk is correct because prompt treatment within the first 10 days greatly reduces the chance of coronary aneurysms, and the majority of children do well. The disease is not uniformly fatal, does not cause permanent heart failure in all children, and does not require surgery for recovery, so the prognosis with timely treatment is generally favorable.
- A clinician suspects Kawasaki disease in a febrile child and recalls a common mnemonic for the principal features. Which finding involving the lips and mouth is part of the diagnostic criteria?
- Painful vesicles on the buccal mucosa
- White exudate on the tonsils
- Strawberry tongue and cracked, erythematous lips
- Koplik spots on the buccal mucosa
Correct answer: Strawberry tongue and cracked, erythematous lips
Strawberry tongue and cracked, erythematous lips is correct because oral mucosal changes including a strawberry tongue and red, fissured lips are among the principal clinical criteria for Kawasaki disease. Painful oral vesicles suggest herpetic or enteroviral disease, tonsillar exudate suggests bacterial pharyngitis, and Koplik spots are pathognomonic for measles, so the strawberry tongue and lip changes are the Kawasaki feature.
- A 5-month-old with bronchiolitis is hospitalized, and the team is deciding on monitoring. Which physiologic parameter is most important to follow closely to guide oxygen therapy and detect deterioration in bronchiolitis?
- Serum sodium alone
- Daily abdominal girth
- Resting heart rate only at discharge
- Oxygen saturation and work of breathing
Correct answer: Oxygen saturation and work of breathing
Oxygen saturation and work of breathing is correct because bronchiolitis primarily threatens oxygenation and ventilation, so monitoring oxygen saturation along with respiratory effort best guides supplemental oxygen and identifies infants who are worsening. Serum sodium, abdominal girth, and an isolated discharge heart rate do not track the respiratory status that drives management decisions in bronchiolitis.
- Parents of a 4-month-old recovering from bronchiolitis at home ask which warning signs should prompt an urgent return to care. Which set of findings is most appropriate to teach as return precautions?
- Increased work of breathing, poor feeding, fewer wet diapers, or bluish color
- A single sneeze and mild fussiness
- Sleeping through the night
- Improved appetite and fewer coughing episodes
Correct answer: Increased work of breathing, poor feeding, fewer wet diapers, or bluish color
Increased work of breathing, poor feeding, fewer wet diapers, or bluish color is correct because these signs indicate worsening respiratory distress, dehydration, or hypoxia that warrant urgent reassessment in an infant with bronchiolitis. A single sneeze with mild fussiness, sleeping well, and improving appetite are reassuring rather than alarming, so they are not the warning signs that should prompt an urgent return.
- A 2-day-old term infant has jaundice, and the clinician explains why physiologic jaundice is common in newborns. Which physiologic factor most contributes to the normal unconjugated hyperbilirubinemia of the first days of life?
- Excessive biliary secretion of conjugated bilirubin
- Increased red cell breakdown combined with immature hepatic bilirubin conjugation
- Overactive hepatic glucuronyl transferase
- Reduced enterohepatic recirculation
Correct answer: Increased red cell breakdown combined with immature hepatic bilirubin conjugation
Increased red cell breakdown combined with immature hepatic conjugation is correct because newborns have a higher red cell turnover and a relatively immature liver enzyme system, leading to the mild unconjugated hyperbilirubinemia of physiologic jaundice. Excessive conjugated secretion, an overactive conjugating enzyme, and reduced enterohepatic recirculation would lower rather than raise unconjugated bilirubin, so they do not explain physiologic jaundice.
- A 2-year-old with a barking cough and stridor is diagnosed with viral croup. The parents ask what virus most commonly causes this illness. Which pathogen is the most frequent cause of croup?
- Haemophilus influenzae type b
- Group A Streptococcus
- Parainfluenza virus
- Cytomegalovirus
Correct answer: Parainfluenza virus
Parainfluenza virus is correct because it is the most common cause of viral croup, producing the characteristic subglottic inflammation, barky cough, and stridor. Haemophilus influenzae type b is the classic cause of epiglottitis, group A Streptococcus causes pharyngitis and other infections, and cytomegalovirus does not typically cause croup, so parainfluenza virus is the leading culprit.
- A clinician is screening a 6-month-old at a well visit and reviews expected milestones to identify any delay. Which gross motor skill is most appropriate to expect a typically developing 6-month-old to be achieving?
- Walking independently
- Running and jumping
- Climbing stairs
- Rolling over in both directions and sitting with support
Correct answer: Rolling over in both directions and sitting with support
Rolling over in both directions and sitting with support is correct because by about 6 months infants typically roll both ways and sit with some support as truncal control develops. Walking independently, running and jumping, and climbing stairs are much later gross motor milestones that exceed what is expected at 6 months, so the rolling and supported sitting best fit this age.
- A clinician counsels parents on the routine infant immunization schedule and the diseases prevented. The DTaP vaccine given in infancy protects against which group of diseases?
- Diphtheria, tetanus, and pertussis
- Measles, mumps, and rubella
- Polio, hepatitis A, and rotavirus
- Influenza, varicella, and hepatitis B
Correct answer: Diphtheria, tetanus, and pertussis
Diphtheria, tetanus, and pertussis is correct because DTaP is the combination vaccine that protects infants and children against these three diseases. Measles, mumps, and rubella are covered by MMR, while polio, hepatitis A, rotavirus, influenza, varicella, and hepatitis B are protected by their own separate vaccines, so DTaP specifically targets diphtheria, tetanus, and pertussis.
- A clinician evaluating an infant for failure to thrive plots weight, length, and head circumference on standardized growth charts over time. Why is using serial growth measurements on standardized charts essential to the assessment?
- A single measurement is always sufficient to diagnose failure to thrive
- Trends across percentiles over time distinguish true failure to thrive from a single low measurement
- Growth charts are used only for premature infants
- Head circumference is irrelevant to growth assessment
Correct answer: Trends across percentiles over time distinguish true failure to thrive from a single low measurement
Trends across percentiles over time distinguishing true failure to thrive from a single low measurement is correct because failure to thrive is defined by inadequate growth over time, such as crossing downward through percentiles, which a single value cannot establish. A one-time measurement is not sufficient, growth charts apply to all infants rather than only premature ones, and head circumference is an important part of overall growth assessment.
- A 23-year-old woman presents to the emergency department with 1 day of right-sided pelvic pain and a small amount of dark vaginal spotting. Her last menstrual period was about 6 weeks ago, and a urine pregnancy test is positive. Her vital signs are stable. Which single test best determines whether the pregnancy is inside or outside the uterus?
- Serum beta-hCG drawn once
- Endometrial biopsy
- Transvaginal ultrasonography
- Pelvic computed tomography
Correct answer: Transvaginal ultrasonography
Transvaginal ultrasonography is the answer because it directly images the uterine cavity and adnexa to determine whether a gestational sac is intrauterine or ectopic, which is the central diagnostic question in early pregnancy with pain. A single beta-hCG suggests pregnancy but cannot show location. Computed tomography exposes the embryo to radiation and is not the first-line imaging study. Endometrial biopsy is not used to localize an early pregnancy.
- A 31-year-old stable woman has a beta-hCG of 2,100 mIU/mL and a transvaginal ultrasound showing no intrauterine pregnancy. The institutional discriminatory level is 3,500 mIU/mL. She has minimal cramping and no adnexal mass. What is the best next step?
- Repeat the beta-hCG in 48 hours and trend it
- Take her to the operating room for laparoscopy
- Perform suction dilation and curettage
- Give methotrexate immediately
Correct answer: Repeat the beta-hCG in 48 hours and trend it
Trending the beta-hCG in 48 hours is correct because her value is below the discriminatory level, so an empty uterus is not diagnostic, and serial values distinguish a normal early intrauterine pregnancy from an abnormal or ectopic one in a stable patient. Giving methotrexate now could destroy a potentially normal pregnancy. Laparoscopy is premature without a confirmed diagnosis. Dilation and curettage is inappropriate before a viable intrauterine pregnancy is excluded.
- Which historical factor most strongly raises a patient's risk of ectopic pregnancy?
- A history of well-controlled asthma
- Prior tubal surgery or a previous ectopic pregnancy
- Regular use of a daily multivitamin
- A family history of preeclampsia
Correct answer: Prior tubal surgery or a previous ectopic pregnancy
Prior tubal surgery or a previous ectopic is the answer because both reflect tubal damage that impairs ovum transport and is among the strongest predictors of a future ectopic implantation. Well-controlled asthma is unrelated to ectopic risk. A daily multivitamin has no association with ectopic pregnancy. A family history of preeclampsia does not affect ectopic risk.
- A 26-year-old woman with a confirmed small unruptured tubal ectopic pregnancy is hemodynamically stable. Her beta-hCG is 2,800 mIU/mL, there is no fetal cardiac activity, and the mass is 2 cm. Her liver and kidney function are normal. Which treatment is most appropriate?
- Single-dose methotrexate
- Oral mifepristone
- Expectant management with no medication
- Emergent laparotomy
Correct answer: Single-dose methotrexate
Single-dose methotrexate is correct because a stable patient with a low beta-hCG, no fetal cardiac activity, a small mass, and normal organ function meets criteria for successful medical therapy. Laparotomy is reserved for instability or rupture. Pure expectant management is less appropriate when active treatment criteria are met and the beta-hCG is not low and declining. Mifepristone is not the standard agent for ectopic pregnancy.
- A patient treated with methotrexate for an ectopic pregnancy returns on day 5 reporting increased abdominal pain. She is afebrile, normotensive, and her abdomen is soft. What does this finding most likely represent?
- Definite tubal rupture requiring immediate surgery
- A sign that methotrexate has failed completely
- Expected separation pain that warrants observation and reassessment
- An allergic reaction to methotrexate
Correct answer: Expected separation pain that warrants observation and reassessment
Expected separation pain is the answer because transient abdominal pain commonly occurs a few days after methotrexate as the trophoblastic tissue involutes, and a stable patient with a benign abdomen can be observed and reassessed rather than rushed to surgery. Tubal rupture would typically produce instability and peritoneal signs. Methotrexate-related pain here is not an allergic reaction. A single episode of pain does not by itself confirm treatment failure.
- A woman is treated with single-dose methotrexate for an ectopic pregnancy. Between day 4 and day 7, her beta-hCG drops by 8 percent. She remains stable. What is the most appropriate next step?
- Begin folic acid supplementation
- Start combined oral contraceptives
- Give a second dose of methotrexate
- Reassure her and stop all follow-up
Correct answer: Give a second dose of methotrexate
Giving a second dose is correct because a decline of less than 15 percent from day 4 to day 7 indicates inadequate response, and a stable patient can receive an additional methotrexate dose per protocol. Stopping follow-up ignores persistent trophoblastic activity. Oral contraceptives do not treat the ectopic. Folic acid would antagonize methotrexate and reduce its efficacy.
- A 28-year-old woman presents with severe lower abdominal pain, a positive pregnancy test, a blood pressure of 78/44 mm Hg, and a tense, distended abdomen. Ultrasound shows a large amount of free pelvic fluid. What is the most appropriate management?
- Immediate surgical exploration
- Single-dose methotrexate
- Misoprostol administration
- Outpatient follow-up with serial beta-hCG
Correct answer: Immediate surgical exploration
Immediate surgical exploration is the answer because hypotension and a large hemoperitoneum indicate a ruptured ectopic pregnancy, which is a surgical emergency requiring operative control of hemorrhage. Outpatient follow-up is unsafe in an unstable, bleeding patient. Methotrexate is only for stable, unruptured cases. Misoprostol has no role in ruptured ectopic pregnancy.
- An Rh-negative woman is diagnosed with an ectopic pregnancy with first-trimester bleeding. In addition to treating the ectopic, which intervention prevents maternal alloimmunization?
- Magnesium sulfate infusion
- Anti-D immune globulin
- Prophylactic broad-spectrum antibiotics
- Tranexamic acid
Correct answer: Anti-D immune globulin
Anti-D immune globulin is correct because an Rh-negative woman with pregnancy-related bleeding, including an ectopic, should receive Rh prophylaxis to prevent sensitization that could harm future pregnancies. Magnesium sulfate is used for seizure prophylaxis or neuroprotection. Antibiotics are not routinely indicated for an uninfected ectopic. Tranexamic acid does not prevent alloimmunization.
- A 30-year-old woman with a positive pregnancy test has a transvaginal ultrasound showing no intrauterine pregnancy and a 4 cm right adnexal mass with fetal cardiac motion. Beta-hCG is 9,500 mIU/mL, and she is stable. Which feature most strongly favors surgery over methotrexate?
- Her hemodynamic stability
- The presence of fetal cardiac activity
- Her desire to preserve fertility
- The unruptured status of the tube
Correct answer: The presence of fetal cardiac activity
Fetal cardiac activity is the answer because it is a relative contraindication to methotrexate, and together with a high beta-hCG and large mass it predicts medical failure and favors surgery. Hemodynamic stability would otherwise support medical therapy. A desire to preserve fertility can be addressed with tube-sparing surgery and does not favor the drug here. An unruptured tube alone is not a reason to choose surgery.
- In an early viable intrauterine pregnancy, the serum beta-hCG should rise by at least approximately what percentage over 48 hours?
- About 5 percent
- About 35 to 50 percent
- About 200 percent
- It should not rise at all
Correct answer: About 35 to 50 percent
A rise of at least about 35 to 50 percent over 48 hours is the expected minimum for a viable early intrauterine pregnancy, and slower rises raise concern for an abnormal or ectopic gestation. A 5 percent rise is too small and abnormal. A 200 percent rise is faster than the physiologic norm. A flat level is concerning for a nonviable pregnancy.
- A 24-year-old woman receives methotrexate for an ectopic pregnancy. Which counseling instruction is most appropriate during her treatment?
- Drink alcohol in moderation as desired
- Increase folic acid intake to support recovery
- Avoid folic acid supplements, alcohol, and nonsteroidal anti-inflammatory drugs
- Take ibuprofen freely for any cramping
Correct answer: Avoid folic acid supplements, alcohol, and nonsteroidal anti-inflammatory drugs
Avoiding folic acid, alcohol, and nonsteroidal anti-inflammatory drugs is correct because folate antagonizes methotrexate, alcohol adds hepatotoxicity, and nonsteroidals can increase drug levels and toxicity. Increasing folic acid would directly reduce methotrexate efficacy. Free ibuprofen use increases toxicity. Alcohol use compounds hepatic injury during therapy.
- A 27-year-old woman with first-trimester bleeding has a positive pregnancy test, an empty uterus on ultrasound, no adnexal mass, and serial beta-hCG values that plateau over several days. She is stable. What is the most accurate description of her clinical situation?
- Ruptured ectopic pregnancy
- Confirmed complete molar pregnancy
- Pregnancy of unknown location with an abnormal beta-hCG trend
- Confirmed normal intrauterine pregnancy
Correct answer: Pregnancy of unknown location with an abnormal beta-hCG trend
Pregnancy of unknown location with an abnormal trend is the answer because a positive test with no visualized intrauterine or ectopic pregnancy defines this category, and a plateauing beta-hCG signals an abnormal gestation that needs close surveillance for occult ectopic. A normal intrauterine pregnancy would show a sac and an appropriately rising level. A molar pregnancy shows characteristic imaging and very high beta-hCG. A ruptured ectopic would typically cause instability.
- A 35-year-old woman successfully treated with methotrexate for an ectopic pregnancy asks how her next pregnancy should be monitored. What is the most appropriate recommendation?
- Schedule an elective cesarean for the next pregnancy
- Avoid pregnancy permanently
- Obtain an early ultrasound to confirm intrauterine location
- No special monitoring is needed
Correct answer: Obtain an early ultrasound to confirm intrauterine location
Early ultrasound is correct because a prior ectopic increases the risk of recurrence, so confirming an intrauterine location early in the next pregnancy is appropriate. No monitoring would miss a repeat ectopic. An elective cesarean is unrelated to early pregnancy localization. Permanent avoidance of pregnancy is not warranted, as future intrauterine pregnancy remains possible.
- A 22-year-old woman with a positive pregnancy test, stable vital signs, and a confirmed small tubal ectopic is being considered for methotrexate. Which baseline laboratory studies are required before dosing?
- Complete blood count with liver and renal function tests
- Thyroid function tests only
- Serum calcium and magnesium
- Lipid panel and fasting glucose
Correct answer: Complete blood count with liver and renal function tests
A complete blood count with liver and renal function tests is correct because methotrexate causes bone marrow suppression, is hepatotoxic, and is renally cleared, so these baselines establish safety before dosing. A lipid panel and fasting glucose are unrelated to methotrexate safety. Thyroid testing is not required. Calcium and magnesium are not part of pre-methotrexate screening.
- A 25-year-old woman with a ruptured ectopic pregnancy who strongly desires future fertility undergoes surgery with a healthy contralateral tube. Which procedure best preserves the affected tube when feasible?
- Bilateral salpingectomy
- Total abdominal hysterectomy
- Salpingostomy
- Oophorectomy
Correct answer: Salpingostomy
Salpingostomy is the answer because it removes the ectopic while conserving the tube, an option considered when fertility preservation is desired, though salpingectomy is often necessary with significant tubal damage or bleeding. Hysterectomy removes the uterus and eliminates fertility. Bilateral salpingectomy removes both tubes and is unnecessary here. Oophorectomy removes an ovary and does not address the tubal pregnancy.
- During labor, a fetal heart rate tracing shows decelerations that begin and end with the contraction and whose lowest point coincides with the contraction peak. How should these be managed?
- Emergent cesarean delivery
- Administer terbutaline for tocolysis
- Continue routine monitoring as this is a benign pattern
- Increase oxytocin to strengthen contractions
Correct answer: Continue routine monitoring as this is a benign pattern
Continuing routine monitoring is correct because these are early decelerations, which mirror the contraction and reflect a benign vagal response to fetal head compression that requires no intervention. Emergent cesarean is unwarranted for a benign pattern. Terbutaline is not needed because the pattern is reassuring. Increasing oxytocin is unnecessary and could be harmful if other concerning findings emerged.
- A laboring patient's tracing shows decelerations whose onset is delayed relative to the contraction, with the nadir occurring after the contraction peak and slow return to baseline. What is the underlying mechanism?
- Fetal head compression
- Uteroplacental insufficiency
- Umbilical cord compression
- Maternal hyperthyroidism
Correct answer: Uteroplacental insufficiency
Uteroplacental insufficiency is the answer because late decelerations are delayed relative to the contraction and reflect impaired placental oxygen transfer to the fetus. Cord compression produces abrupt variable decelerations. Head compression produces uniform early decelerations. Maternal hyperthyroidism raises the baseline rate rather than causing late decelerations.
- A fetal tracing shows abrupt, sharp decreases in heart rate that vary in shape and timing relative to contractions, with quick recovery. Which intervention most directly addresses the cause?
- Immediate administration of magnesium sulfate
- Performing amniotomy to accelerate labor
- Increasing the oxytocin infusion
- Maternal repositioning to relieve cord compression
Correct answer: Maternal repositioning to relieve cord compression
Maternal repositioning is correct because variable decelerations are caused by cord compression, and changing maternal position can relieve pressure on the cord. Magnesium sulfate does not address cord compression. Increasing oxytocin would intensify contractions and worsen compression. Amniotomy does not relieve compression and may risk cord prolapse.
- Which fetal heart rate finding is the strongest single reassuring indicator of adequate fetal oxygenation and normal acid-base status?
- A sinusoidal waveform
- Absent variability
- Recurrent late decelerations
- Moderate baseline variability
Correct answer: Moderate baseline variability
Moderate baseline variability is the answer because intact beat-to-beat variability reflects a well-oxygenated fetal central nervous system and is the most reassuring single sign of normal acid-base balance. A sinusoidal waveform is ominous. Absent variability is concerning for hypoxia. Recurrent late decelerations suggest uteroplacental compromise.
- A term fetal tracing shows a baseline of 130 beats per minute, moderate variability, occasional accelerations, and no decelerations. How is this tracing categorized?
- Category III, abnormal
- Category II, indeterminate
- Category I, normal
- Sinusoidal, ominous
Correct answer: Category I, normal
Category I is correct because a baseline of 110 to 160 with moderate variability, no late or variable decelerations, and possible accelerations defines a normal tracing predicting normal fetal acid-base status. Category III requires absent variability with recurrent decelerations or a sinusoidal pattern. Category II is everything in between. A sinusoidal pattern is not present here.
- A laboring patient develops recurrent late decelerations with minimal variability that persist despite repositioning, oxygen, intravenous fluids, and stopping oxytocin. What is the most appropriate next step?
- Administer a tocolytic and discharge
- Continue expectant management for several hours
- Proceed toward expedited delivery
- Restart oxytocin at a higher rate
Correct answer: Proceed toward expedited delivery
Proceeding toward expedited delivery is correct because persistent late decelerations with reduced variability that do not improve with intrauterine resuscitation indicate fetal compromise requiring prompt delivery. Continued expectant management risks fetal injury. Discharging the patient is unsafe with an at-risk fetus. Restarting oxytocin would worsen the situation.
- A fetal heart rate baseline of 100 beats per minute is sustained for more than 10 minutes during labor. This finding is best described as which of the following?
- Normal baseline
- Fetal tachycardia
- A reassuring acceleration
- Fetal bradycardia
Correct answer: Fetal bradycardia
Fetal bradycardia is the answer because a sustained baseline below 110 beats per minute meets the definition of bradycardia and prompts evaluation for causes such as cord compression or hypoxia. Tachycardia is a baseline above 160. A normal baseline is 110 to 160. An acceleration is a transient rise above baseline, not a sustained low rate.
- A sudden, sustained fetal bradycardia develops immediately after spontaneous rupture of membranes, and a vaginal examination reveals a pulsating cord below the presenting part. What is the most appropriate immediate action?
- Administer oxytocin to hasten delivery
- Reassure and resume routine monitoring
- Perform fetal scalp stimulation and observe
- Manually elevate the presenting part and prepare for emergent cesarean delivery
Correct answer: Manually elevate the presenting part and prepare for emergent cesarean delivery
Manually elevating the presenting part and preparing for emergent cesarean is correct because a palpable, pulsating cord with bradycardia indicates umbilical cord prolapse, and lifting the presenting part off the cord while moving to delivery is lifesaving. Oxytocin would worsen compression. Routine monitoring ignores an emergency. Scalp stimulation does not relieve cord compression.
- A reactive nonstress test in a term fetus is defined by which of the following acceleration criteria?
- No accelerations over 40 minutes
- A single deceleration with each fetal movement
- A flat baseline with absent variability
- At least two accelerations of 15 beats per minute lasting at least 15 seconds within 20 minutes
Correct answer: At least two accelerations of 15 beats per minute lasting at least 15 seconds within 20 minutes
Two accelerations of at least 15 beats per minute for at least 15 seconds within 20 minutes is correct because this defines a reactive (reassuring) nonstress test in a term fetus. Absence of accelerations describes a nonreactive test. Decelerations with movement are not the criteria for reactivity. A flat baseline with absent variability is abnormal.
- A 33-year-old woman at 37 weeks gestation is found to have a blood pressure of 158/108 mm Hg on repeat measurement, 2+ proteinuria, and a severe headache with blurred vision. Which medication should be started for seizure prophylaxis?
- Levetiracetam
- Magnesium sulfate
- Lorazepam
- Phenytoin
Correct answer: Magnesium sulfate
Magnesium sulfate is the answer because it is the first-line agent for preventing eclamptic seizures in preeclampsia with severe features and is superior to standard anticonvulsants. Phenytoin is less effective for this indication. Lorazepam may abort an active seizure but is not the prophylactic standard. Levetiracetam is not first-line for eclampsia prophylaxis.
- A patient on a magnesium sulfate infusion for severe preeclampsia becomes drowsy, loses her patellar reflexes, and develops a respiratory rate of 9 per minute. What is the most appropriate immediate intervention?
- Administer intravenous calcium gluconate
- Start a furosemide drip
- Increase the magnesium infusion rate
- Give intravenous hydralazine
Correct answer: Administer intravenous calcium gluconate
Intravenous calcium gluconate is correct because it is the antidote for magnesium toxicity, reversing the neuromuscular and respiratory depression that follows loss of reflexes. Increasing magnesium would deepen the toxicity. Hydralazine treats blood pressure, not magnesium toxicity. Furosemide does not reverse magnesium effects.
- Which set of findings defines preeclampsia with severe features in a pregnant woman after 20 weeks?
- Mild headache with a normal blood pressure
- Systolic 160 or higher or diastolic 110 or higher, or signs such as thrombocytopenia or impaired liver function
- Blood pressure of 130/85 with trace proteinuria
- Isolated ankle edema with normal blood pressure
Correct answer: Systolic 160 or higher or diastolic 110 or higher, or signs such as thrombocytopenia or impaired liver function
Severe-range blood pressure or evidence of end-organ involvement such as thrombocytopenia or impaired liver function is the answer because these define preeclampsia with severe features. A pressure of 130/85 with trace protein does not meet diagnostic thresholds. Isolated edema is nonspecific and not diagnostic. A mild headache with normal pressure is not a severe feature.
- A 29-year-old woman at 38 weeks with preeclampsia with severe features has her blood pressure controlled and magnesium started. What is the definitive treatment of her disease?
- Strict bed rest until 41 weeks
- Indefinite outpatient antihypertensive therapy
- A course of antenatal corticosteroids alone
- Delivery of the fetus and placenta
Correct answer: Delivery of the fetus and placenta
Delivery of the fetus and placenta is correct because removal of the placenta is the only definitive cure for preeclampsia, and at term with severe features delivery is indicated after stabilization. Bed rest does not cure the disease. Outpatient antihypertensives only manage blood pressure. Corticosteroids accelerate fetal lung maturity but do not treat the underlying disorder.
- A pregnant woman at 36 weeks with hypertension and proteinuria has a generalized tonic-clonic seizure. After securing the airway, which medication is used to control and prevent recurrent seizures?
- Hydralazine as monotherapy
- Magnesium sulfate
- Nifedipine as monotherapy
- Phenobarbital
Correct answer: Magnesium sulfate
Magnesium sulfate is the answer because eclampsia is treated and recurrent seizures are prevented with magnesium, which outperforms standard anticonvulsants in this setting. Nifedipine and hydralazine lower blood pressure but do not prevent eclamptic seizures. Phenobarbital is not the standard agent for eclampsia.
- A 31-year-old woman at 33 weeks with hypertension develops right upper quadrant pain, nausea, a platelet count of 60,000, elevated aspartate aminotransferase, and schistocytes on smear. Which diagnosis best fits this presentation?
- Gestational thrombocytopenia
- HELLP syndrome
- Acute fatty liver of pregnancy
- Hyperemesis gravidarum
Correct answer: HELLP syndrome
HELLP syndrome is correct because hemolysis with schistocytes, elevated liver enzymes, and low platelets in a hypertensive pregnant patient defines this severe variant of preeclampsia. Acute fatty liver typically presents with hypoglycemia and marked coagulopathy without the classic hemolysis pattern. Gestational thrombocytopenia is mild and lacks hemolysis and liver involvement. Hyperemesis gravidarum is a disorder of vomiting, not this laboratory triad.
- A woman with multiple high-risk factors for preeclampsia is seen at 12 weeks gestation. Which intervention reduces her risk of developing preeclampsia?
- Daily magnesium sulfate from the first trimester
- Therapeutic-dose heparin throughout pregnancy
- Routine bed rest beginning now
- Daily low-dose aspirin started in the late first trimester
Correct answer: Daily low-dose aspirin started in the late first trimester
Daily low-dose aspirin started in the late first trimester is correct because it reduces preeclampsia incidence in high-risk women and is the recommended preventive measure. Magnesium sulfate is for seizure prophylaxis once disease develops, not prevention. Therapeutic heparin is not a preeclampsia preventive. Routine bed rest is not an effective prevention strategy.
- A woman with preeclampsia has a sustained blood pressure of 172/116 mm Hg. Which oral agent is an acceptable first-line option for acute control of severe-range hypertension when intravenous access is delayed?
- Oral spironolactone
- Immediate-release oral nifedipine
- Oral atenolol
- Oral lisinopril
Correct answer: Immediate-release oral nifedipine
Immediate-release oral nifedipine is the answer because it is a recognized first-line option for acute severe-range hypertension in preeclampsia, alongside intravenous labetalol and hydralazine. Atenolol is not used for acute control and is generally avoided in pregnancy. Spironolactone is not used for acute hypertension in this setting. Lisinopril is an angiotensin-converting enzyme inhibitor that is contraindicated in pregnancy.
- A woman with gestational hypertension that progresses to preeclampsia without severe features reaches 37 weeks of gestation. What is the recommended delivery plan?
- Await spontaneous labor only
- Deliver at 37 weeks
- Deliver immediately at the time of diagnosis regardless of gestational age
- Continue pregnancy until 42 weeks
Correct answer: Deliver at 37 weeks
Delivery at 37 weeks is correct because preeclampsia without severe features is generally delivered at 37 weeks to balance maternal risk and prematurity. Continuing to 42 weeks prolongs disease exposure unnecessarily. Immediate delivery regardless of age is reserved for severe or worsening disease. Waiting only for spontaneous labor delays needed delivery.
- While on a magnesium sulfate infusion, which bedside parameter should be checked regularly to detect early magnesium toxicity?
- Random blood glucose
- Body temperature
- Serum potassium
- Deep tendon reflexes
Correct answer: Deep tendon reflexes
Deep tendon reflexes is the answer because loss of reflexes is the earliest clinical sign of magnesium toxicity, preceding respiratory depression and cardiac effects. Serum potassium is not the relevant early marker. Blood glucose is not affected by magnesium toxicity. Temperature does not track magnesium levels.
- A woman delivers vaginally and then bleeds heavily; the uterine fundus is soft and poorly contracted. What is the single most common cause of her early postpartum hemorrhage?
- Retained placental tissue
- Cervical laceration
- Uterine atony
- An underlying coagulopathy
Correct answer: Uterine atony
Uterine atony is the answer because a soft, poorly contracted uterus that fails to clamp down on bleeding vessels is the most common cause of postpartum hemorrhage among the four Ts. Retained tissue and lacerations are less frequent causes. Coagulopathy accounts for only a small minority of cases.
- After diagnosing uterine atony as the cause of postpartum bleeding, which combined action is the appropriate first-line response?
- Give only intravenous fluids and observe
- Proceed directly to hysterectomy
- Order uterine artery embolization first
- Perform uterine fundal massage and give a uterotonic such as oxytocin
Correct answer: Perform uterine fundal massage and give a uterotonic such as oxytocin
Fundal massage with a uterotonic such as oxytocin is correct because mechanical stimulation plus pharmacologic uterine contraction is the first-line management of atony. Hysterectomy is a last resort. Embolization is reserved for refractory cases. Fluids alone do not address the failure of the uterus to contract.
- A postpartum patient with atony and ongoing bleeding has poorly controlled chronic hypertension. Which uterotonic is contraindicated?
- Methylergonovine
- Tranexamic acid
- Misoprostol
- Oxytocin
Correct answer: Methylergonovine
Methylergonovine is the answer because this ergot alkaloid causes vasoconstriction and can dangerously raise blood pressure, making it contraindicated in hypertension. Oxytocin is the safe first-line agent. Misoprostol is acceptable. Tranexamic acid is an antifibrinolytic adjunct, not contraindicated by hypertension.
- A postpartum woman with atony continues bleeding despite massage and oxytocin. She has severe persistent asthma. Which uterotonic should be avoided?
- Tranexamic acid
- Carboprost
- Misoprostol
- Oxytocin
Correct answer: Carboprost
Carboprost should be avoided because this prostaglandin F2-alpha analogue can provoke bronchospasm and is contraindicated in asthma. Misoprostol is acceptable in patients with asthma. Oxytocin remains safe and first-line. Tranexamic acid is an antifibrinolytic and is not contraindicated by asthma.
- In the four Ts framework for postpartum hemorrhage, which cause does the T for thrombin represent?
- Retained placenta
- A coagulation disorder
- A vaginal laceration
- Uterine atony
Correct answer: A coagulation disorder
A coagulation disorder is the answer because the thrombin category of the four Ts represents bleeding from coagulopathy. Uterine atony is the tone category. Retained placenta is the tissue category. A laceration falls under the trauma category.
- A woman has steady postpartum bleeding despite a firm, well-contracted uterus, and the placenta was delivered complete. Inspection reveals a bleeding tear along the vaginal wall. What is the most likely cause and management?
- Retained tissue requiring curettage
- Genital tract trauma requiring surgical repair of the laceration
- Uterine atony requiring more oxytocin
- Coagulopathy requiring platelet transfusion
Correct answer: Genital tract trauma requiring surgical repair of the laceration
Genital tract trauma requiring repair is correct because bleeding from a firm uterus with an intact placenta points to a laceration, and the visualized tear should be sutured. Atony is excluded by the firm uterus. Retained tissue is excluded by the complete placenta. Coagulopathy typically produces diffuse oozing rather than a discrete bleeding tear.
- Postpartum hemorrhage after delivery is defined by a cumulative blood loss of at least how much, or any blood loss accompanied by signs of hypovolemia, within 24 hours?
- 1,000 mL
- 100 mL
- 3,000 mL
- 300 mL
Correct answer: 1,000 mL
A cumulative blood loss of at least 1,000 mL, or any loss with signs of hypovolemia within 24 hours, defines postpartum hemorrhage under current criteria. A 300 mL loss is within normal limits. A 3,000 mL threshold is far higher than the accepted definition. A 100 mL loss is trivial.
- A patient with severe atonic postpartum hemorrhage has failed massage, oxytocin, and additional uterotonics and remains unstable. Which intervention is an appropriate escalation before hysterectomy?
- Observation with a repeat hemoglobin in 24 hours
- Oral contraceptive pills
- Intrauterine balloon tamponade
- Discharge with iron supplements
Correct answer: Intrauterine balloon tamponade
Intrauterine balloon tamponade is the answer because it applies direct intrauterine pressure and is an appropriate escalation when pharmacologic measures fail, often avoiding hysterectomy. Discharge is unsafe in an unstable, bleeding patient. Observation delays needed intervention. Oral contraceptives do not control acute hemorrhage.
- Which adjunctive medication, given early in postpartum hemorrhage, reduces death from bleeding by inhibiting clot breakdown?
- Oxytocin
- Calcium gluconate
- Tranexamic acid
- Methylergonovine
Correct answer: Tranexamic acid
Tranexamic acid is correct because this antifibrinolytic given early reduces mortality from postpartum bleeding by stabilizing clot. Methylergonovine is a uterotonic, not an antifibrinolytic. Calcium gluconate treats magnesium toxicity. Oxytocin promotes uterine contraction but does not inhibit fibrinolysis.
- A woman who delivered 10 days ago returns with foul-smelling lochia, fever, uterine tenderness, and new bleeding. Which cause of delayed postpartum hemorrhage should be most strongly considered?
- A cervical laceration from delivery
- Uterine atony
- Endometritis with possible retained products of conception
- Acute placental abruption
Correct answer: Endometritis with possible retained products of conception
Endometritis with possible retained products is the answer because secondary (delayed) postpartum hemorrhage days to weeks after delivery, especially with fever, foul lochia, and tenderness, suggests infection often associated with retained tissue. Atony causes immediate, not delayed, bleeding. A delivery laceration would have bled at the time of birth. Abruption is an antepartum event and is not relevant after delivery.
- At what gestational age is universal screening for gestational diabetes routinely performed in average-risk pregnant women?
- 24 to 28 weeks
- 8 to 10 weeks
- After 38 weeks
- 16 to 18 weeks
Correct answer: 24 to 28 weeks
Screening at 24 to 28 weeks is correct because placental hormones produce maximal insulin resistance during this period, making it the standard time to detect gestational diabetes in average-risk women. The 8 to 10 week window is too early for routine screening. The 16 to 18 week window is also too early. Testing after 38 weeks is too late to manage the pregnancy effectively.
- In the two-step approach to gestational diabetes screening, an abnormal one-hour 50-gram glucose challenge test should be followed by which test?
- A random plasma glucose at the next visit
- A three-hour 100-gram oral glucose tolerance test
- An immediate hemoglobin A1c
- A repeat one-hour challenge in one week
Correct answer: A three-hour 100-gram oral glucose tolerance test
A three-hour 100-gram oral glucose tolerance test is correct because the one-hour challenge is only a screen, and an abnormal result requires the confirmatory three-hour test to establish the diagnosis. Repeating the one-hour test does not confirm the diagnosis. A random glucose is not the confirmatory test. Hemoglobin A1c is not the standard confirmatory test in this pathway.
- A woman with gestational diabetes does not reach glucose targets after a trial of medical nutrition therapy and exercise. What is the preferred first-line pharmacologic treatment?
- A high-dose sulfonylurea
- An angiotensin-converting enzyme inhibitor
- No pharmacologic therapy is ever appropriate in pregnancy
- Insulin
Correct answer: Insulin
Insulin is the answer because it is the preferred first-line agent for gestational diabetes when lifestyle measures fail, since it does not cross the placenta in meaningful amounts. Sulfonylureas are alternatives but not first-line. Angiotensin-converting enzyme inhibitors are contraindicated in pregnancy and do not treat hyperglycemia. The claim that medication is never used is false when targets are unmet.
- Which neonatal complication is most directly associated with poorly controlled maternal gestational diabetes?
- Intrauterine growth restriction
- Congenital cataracts
- Fetal macrosomia
- Microcephaly
Correct answer: Fetal macrosomia
Fetal macrosomia is correct because excess maternal glucose crosses the placenta and stimulates fetal insulin, driving overgrowth and a large-for-gestational-age infant. Intrauterine growth restriction is more typical of placental insufficiency, not gestational diabetes. Microcephaly is not characteristic. Congenital cataracts are not a typical consequence of gestational diabetes.
- A woman with diet-controlled gestational diabetes delivers a healthy infant. Which postpartum follow-up is recommended to assess for persistent glucose intolerance?
- A 75-gram oral glucose tolerance test at 4 to 12 weeks postpartum
- No further testing is needed
- A fasting glucose only on the day of discharge
- Lifelong insulin therapy
Correct answer: A 75-gram oral glucose tolerance test at 4 to 12 weeks postpartum
A 75-gram oral glucose tolerance test at 4 to 12 weeks postpartum is correct because women with gestational diabetes are at increased risk of developing type 2 diabetes and require reassessment after delivery. No follow-up would miss persistent disease. Lifelong insulin is not indicated when gestational diabetes resolves. A discharge-day fasting glucose does not reliably reflect the postpartum glucose state.
- Which patient should undergo early screening for diabetes at the first prenatal visit rather than waiting until 24 to 28 weeks?
- A 34-year-old with obesity and a prior infant weighing over 4,500 grams
- A first-time mother with no medical history
- A patient with a normal first-trimester ultrasound
- A 22-year-old with a normal body mass index and no risk factors
Correct answer: A 34-year-old with obesity and a prior infant weighing over 4,500 grams
The woman with obesity and a prior macrosomic infant is the answer because high-risk features such as obesity, prior gestational diabetes, or a previous large baby justify early screening at the first visit. A young woman with a normal body mass index and no risk factors is low-risk. Being a first-time mother is not a risk factor. A normal ultrasound does not warrant early diabetes screening.
- Why is maternal glucose monitored closely during labor in a woman with insulin-treated gestational diabetes?
- To diagnose preeclampsia
- To reduce the risk of neonatal hypoglycemia after birth
- To assess cervical dilation
- To screen for placenta previa
Correct answer: To reduce the risk of neonatal hypoglycemia after birth
Reducing neonatal hypoglycemia is correct because maternal hyperglycemia in labor drives fetal insulin production, and after delivery the elevated insulin can cause newborn hypoglycemia, so intrapartum glucose is kept controlled. Glucose monitoring does not screen for placenta previa, diagnose preeclampsia, or measure cervical dilation.
- A woman with gestational diabetes has good glycemic control on insulin and a normally grown fetus. Regarding maternal risk, gestational diabetes most strongly increases her long-term risk of which condition?
- Hypothyroidism
- Rheumatoid arthritis
- Type 2 diabetes mellitus later in life
- Multiple sclerosis
Correct answer: Type 2 diabetes mellitus later in life
Type 2 diabetes later in life is correct because gestational diabetes identifies women with impaired glucose handling who carry a substantially increased lifetime risk of developing type 2 diabetes. Rheumatoid arthritis, multiple sclerosis, and hypothyroidism are not specifically increased by a history of gestational diabetes.
- A 32-year-old woman at 31 weeks gestation has painless, bright-red vaginal bleeding. Before any digital cervical examination is performed, which study is most appropriate?
- Ultrasound to localize the placenta
- Amniocentesis
- Immediate digital cervical examination
- Oxytocin challenge test
Correct answer: Ultrasound to localize the placenta
Ultrasound to localize the placenta is correct because painless third-trimester bleeding suggests placenta previa, and the placenta must be localized before a digital examination, since examining a previa can cause catastrophic hemorrhage. A digital exam is contraindicated until previa is excluded. Amniocentesis does not evaluate the bleeding. An oxytocin challenge could worsen bleeding.
- A 30-year-old woman at 35 weeks gestation presents after a fall with sudden painful vaginal bleeding, a firm tender uterus, and frequent contractions. What is the most likely diagnosis?
- Vasa previa
- Placenta previa
- Placental abruption
- Cervical polyp
Correct answer: Placental abruption
Placental abruption is the answer because painful bleeding with a tender, firm uterus after trauma is the classic presentation of premature placental separation. Placenta previa causes painless bleeding with a soft uterus. Vasa previa involves fetal vessel rupture, often with acute fetal distress at membrane rupture. A cervical polyp causes minor bleeding without uterine tenderness.
- Which clinical feature best distinguishes placental abruption from placenta previa at presentation?
- Abruption is reliably diagnosed by ultrasound location
- Abruption causes painful bleeding while previa causes painless bleeding
- Previa always causes a rigid, tender uterus
- Previa is typically preceded by abdominal trauma
Correct answer: Abruption causes painful bleeding while previa causes painless bleeding
The painful-versus-painless distinction is correct because abruption presents with painful bleeding and uterine tenderness, whereas previa presents with painless bleeding from a low-lying placenta. Trauma is a risk factor for abruption, not previa. Abruption is largely a clinical diagnosis because ultrasound is insensitive for it. A rigid, tender uterus characterizes abruption, not previa.
- A woman with a known complete placenta previa has had a self-limited bleed at 32 weeks and is now stable with a reassuring fetus. What is the appropriate planned mode of delivery?
- Scheduled cesarean delivery
- Vaginal delivery once she reaches 40 weeks
- Induction for vaginal delivery now
- Operative vaginal delivery with forceps
Correct answer: Scheduled cesarean delivery
Scheduled cesarean delivery is correct because a complete previa covers the cervix and makes vaginal delivery unsafe, so a planned cesarean is required. Induction for vaginal delivery is contraindicated with complete previa. A vaginal delivery at 40 weeks is unsafe with the placenta over the os. Operative vaginal delivery is also contraindicated with a complete previa.
- Which serious maternal coagulation complication is most characteristically associated with a severe placental abruption?
- Disseminated intravascular coagulation
- Iron-deficiency anemia only
- Essential thrombocythemia
- Polycythemia
Correct answer: Disseminated intravascular coagulation
Disseminated intravascular coagulation is the answer because release of placental thromboplastin during a severe abruption can trigger a consumptive coagulopathy with bleeding. Polycythemia is not a feature of abruption. Iron-deficiency anemia is a chronic process, not the acute coagulopathy of abruption. Essential thrombocythemia is a myeloproliferative disorder unrelated to abruption.
- A woman at 33 weeks with confirmed placenta previa has stopped bleeding and is being managed expectantly. Which intervention is appropriate during this period?
- Immediate amniotomy
- Therapeutic anticoagulation
- Antenatal corticosteroids for fetal lung maturity
- Cervical ripening with misoprostol
Correct answer: Antenatal corticosteroids for fetal lung maturity
Antenatal corticosteroids are correct because a preterm patient with previa who may require early delivery benefits from betamethasone to accelerate fetal lung maturity. Cervical ripening to induce labor is dangerous with a previa obstructing the cervix. Anticoagulation would worsen bleeding. Amniotomy is contraindicated in previa.
- A 38-year-old woman with two prior cesarean deliveries and a current placenta previa has ultrasound showing loss of the retroplacental clear zone and placental lacunae extending toward the bladder. Which condition do these findings suggest?
- Simple previa without invasion
- Uterine fibroid degeneration
- Placenta accreta spectrum
- Vasa previa
Correct answer: Placenta accreta spectrum
Placenta accreta spectrum is the answer because loss of the retroplacental clear zone and lacunae extending toward the bladder in a woman with prior cesareans and a previa indicate abnormally invasive placentation. Vasa previa involves fetal vessels over the os, not these invasion signs. Simple previa lacks these invasion features. Fibroid degeneration produces a different sonographic appearance and is unrelated to placental invasion.
- A woman with a significant placental abruption is hemodynamically unstable and the fetal tracing is category III. What is the most appropriate management?
- Tocolysis to prolong the pregnancy
- Awaiting spontaneous resolution
- Outpatient observation
- Emergent delivery, usually by cesarean
Correct answer: Emergent delivery, usually by cesarean
Emergent delivery is the answer because maternal instability with fetal compromise from a significant abruption requires prompt delivery, typically by cesarean, to save both mother and fetus. Tocolysis would dangerously delay delivery. Outpatient observation is unsafe. Awaiting spontaneous resolution risks fetal death and maternal hemorrhage.
- A woman at 29 weeks gestation has regular painful contractions and documented progressive cervical dilation. Which medication is administered specifically to reduce neonatal respiratory distress syndrome?
- Betamethasone
- Ampicillin
- Magnesium sulfate
- Nifedipine
Correct answer: Betamethasone
Betamethasone is correct because antenatal corticosteroids accelerate fetal lung maturity and reduce neonatal respiratory distress when preterm delivery is anticipated. Nifedipine is a tocolytic that delays delivery but does not mature the lungs. Ampicillin treats infection, not lung immaturity. Magnesium sulfate provides fetal neuroprotection, not lung maturation.
- In a woman in preterm labor before 32 weeks, magnesium sulfate is administered primarily for which purpose?
- Acute blood pressure reduction
- Prolonged tocolysis for several weeks
- Treatment of group B streptococcus colonization
- Fetal neuroprotection to lower the risk of cerebral palsy
Correct answer: Fetal neuroprotection to lower the risk of cerebral palsy
Fetal neuroprotection is the answer because magnesium sulfate given before 32 weeks reduces the risk and severity of cerebral palsy in the preterm neonate. It is not used for prolonged tocolysis. It is not given primarily to lower blood pressure in this setting. It does not treat group B strep colonization.
- What is the main rationale for short-term tocolysis in a woman with preterm labor at 28 weeks?
- To buy time for corticosteroids to act and for maternal transfer to a higher-level facility
- To treat the underlying cause of preterm labor
- To permanently stop all uterine activity
- To prevent delivery until full term
Correct answer: To buy time for corticosteroids to act and for maternal transfer to a higher-level facility
Buying time for corticosteroids and transfer is correct because tocolytics provide a brief window, about 48 hours, for steroids to mature the fetal lungs and for transfer to a facility with neonatal care. Tocolysis does not reliably prevent delivery until term. It does not permanently stop contractions. It does not treat an underlying cause such as infection.
- Which finding most strongly distinguishes true preterm labor from Braxton Hicks contractions?
- Contractions felt only with fetal movement
- Contractions that resolve completely with hydration and rest
- Irregular contractions without cervical change
- Regular contractions with progressive cervical dilation and effacement
Correct answer: Regular contractions with progressive cervical dilation and effacement
Regular contractions with progressive cervical change is the answer because true preterm labor is defined by regular contractions producing documented cervical dilation and effacement before 37 weeks. Contractions that resolve with hydration suggest Braxton Hicks. Absence of cervical change argues against true labor. Contractions only with fetal movement are not diagnostic of labor.
- Within which gestational age range do antenatal corticosteroids have the clearest established benefit for reducing neonatal complications when preterm delivery is anticipated?
- Between 24 and 34 weeks
- Before 20 weeks
- Only at exactly 40 weeks
- After 39 weeks
Correct answer: Between 24 and 34 weeks
The 24 to 34 week range is the answer because antenatal corticosteroids most clearly reduce neonatal complications when delivery is anticipated within this window of prematurity. After 39 weeks the fetus is term and steroids are not indicated. Before 20 weeks the fetus is previable. At exactly 40 weeks the pregnancy is term and steroids provide no benefit.
- A woman at 32 weeks in preterm labor receives a tocolytic, betamethasone, and magnesium sulfate. Which statement best describes the role of the betamethasone?
- It reduces neonatal respiratory distress, intraventricular hemorrhage, and necrotizing enterocolitis
- It is the primary agent to stop contractions
- It provides fetal neuroprotection against cerebral palsy
- It treats group B streptococcus colonization
Correct answer: It reduces neonatal respiratory distress, intraventricular hemorrhage, and necrotizing enterocolitis
Reducing respiratory distress along with intraventricular hemorrhage and necrotizing enterocolitis is the established benefit of antenatal corticosteroids in anticipated preterm birth. The tocolytic, not the steroid, stops contractions. Magnesium, not the steroid, provides neuroprotection. Penicillin, not the steroid, treats group B strep colonization.
- A woman at 30 weeks presents in preterm labor with ruptured membranes and unknown group B streptococcus status. In addition to steroids and magnesium, which therapy is appropriate?
- Methotrexate
- Therapeutic anticoagulation
- Carboprost
- Intrapartum antibiotics for group B streptococcus prophylaxis
Correct answer: Intrapartum antibiotics for group B streptococcus prophylaxis
Intrapartum antibiotics for group B strep prophylaxis is correct because preterm labor with ruptured membranes and unknown group B strep status warrants empiric prophylaxis to prevent neonatal infection. Methotrexate treats ectopic pregnancy. Carboprost is a postpartum uterotonic. Anticoagulation has no role here.
- A 47-year-old woman has heavy, irregular menstrual bleeding. Using the PALM-COEIN classification, which category includes adenomyosis and leiomyoma?
- The nonstructural COEIN categories
- The iatrogenic category only
- The structural PALM categories
- The pregnancy-related categories
Correct answer: The structural PALM categories
The structural PALM categories is the answer because PALM stands for Polyp, Adenomyosis, Leiomyoma, and Malignancy or hyperplasia, the structural causes evaluable by imaging or histology. COEIN covers nonstructural causes such as coagulopathy and ovulatory dysfunction. Pregnancy-related bleeding is excluded from this system. The iatrogenic category is a single COEIN component, not where adenomyosis and leiomyoma belong.
- A 54-year-old postmenopausal woman has new vaginal bleeding. What is the most appropriate initial step to evaluate for endometrial pathology?
- Immediate hysterectomy
- Reassurance with no testing
- Empiric combined oral contraceptives
- Endometrial biopsy or transvaginal ultrasound to assess the endometrium
Correct answer: Endometrial biopsy or transvaginal ultrasound to assess the endometrium
Endometrial biopsy or transvaginal ultrasound is correct because any postmenopausal bleeding must be evaluated to exclude endometrial cancer, and tissue sampling or measuring endometrial thickness is the standard initial workup. Reassurance without testing is unsafe given cancer risk. Hysterectomy is premature without a diagnosis. Oral contraceptives do not exclude malignancy.
- A 15-year-old with irregular, unpredictable bleeding since menarche has a normal examination and negative pregnancy test. Which PALM-COEIN category most likely accounts for her bleeding?
- Malignancy
- Leiomyoma
- Ovulatory dysfunction
- Adenomyosis
Correct answer: Ovulatory dysfunction
Ovulatory dysfunction is the answer because anovulatory cycles from an immature hypothalamic-pituitary-ovarian axis are very common near menarche and produce irregular bleeding. Leiomyomas are uncommon at this age. Malignancy is rare in adolescents. Adenomyosis typically affects older, parous women.
- A 28-year-old woman has had heavy menstrual bleeding since menarche along with frequent gum bleeding and easy bruising. Which underlying cause should be evaluated?
- Adenomyosis
- A uterine leiomyoma
- Endometrial carcinoma
- An inherited coagulopathy such as von Willebrand disease
Correct answer: An inherited coagulopathy such as von Willebrand disease
An inherited coagulopathy is correct because heavy bleeding since menarche with mucocutaneous bleeding points to a disorder like von Willebrand disease, the coagulopathy category of PALM-COEIN. Endometrial carcinoma is unlikely at her age and does not cause systemic mucocutaneous bleeding. A leiomyoma would not explain gum bleeding and bruising. Adenomyosis causes localized uterine symptoms.
- A 36-year-old woman with abnormal uterine bleeding wants both reduced menstrual flow and contraception. Which single option best provides both?
- A copper intrauterine device
- The levonorgestrel-releasing intrauterine device
- Tranexamic acid alone
- Endometrial ablation
Correct answer: The levonorgestrel-releasing intrauterine device
The levonorgestrel-releasing intrauterine device is correct because it markedly reduces menstrual blood loss while providing effective contraception. The copper device provides contraception but tends to increase bleeding. Tranexamic acid reduces bleeding but offers no contraception. Endometrial ablation reduces bleeding but is not contraceptive and is unsuitable for women desiring future fertility.
- A 58-year-old woman with postmenopausal bleeding has a transvaginal ultrasound showing an endometrial thickness of 14 mm. What is the most appropriate next step?
- Reassurance with follow-up in one year
- Empiric tranexamic acid
- Begin hormone replacement therapy
- Endometrial biopsy
Correct answer: Endometrial biopsy
Endometrial biopsy is the answer because a thickened endometrium in a postmenopausal woman with bleeding requires tissue sampling to exclude hyperplasia or carcinoma. Starting hormone therapy before excluding malignancy is inappropriate. Reassurance with a one-year delay is unsafe. Tranexamic acid does not address the need to rule out cancer.
- A 42-year-old woman with heavy menstrual bleeding has a bulky, irregularly enlarged uterus on examination and multiple hypoechoic intramural masses on ultrasound. Which PALM-COEIN structural cause is most likely?
- Ovulatory dysfunction
- Iatrogenic causes
- Coagulopathy
- Leiomyoma
Correct answer: Leiomyoma
Leiomyoma is the answer because an enlarged, irregular uterus with intramural masses and heavy bleeding is the classic presentation of fibroids, a structural cause in the PALM group. Coagulopathy causes a bleeding tendency without an enlarged uterus. Ovulatory dysfunction does not enlarge the uterus. Iatrogenic causes relate to medications or devices, not uterine masses.
- At what age does routine cervical cancer screening with cytology begin under current United States guidelines?
- Age 18
- Age 25
- Age 21
- At the onset of sexual activity regardless of age
Correct answer: Age 21
Beginning at age 21 is correct because current guidelines start cervical cytology at 21 regardless of sexual history, since cervical cancer is rare before that age and most early infections clear spontaneously. Age 18 is too early. Age 25 would miss disease in women in their early twenties. Screening at the onset of sexual activity is no longer recommended.
- For an average-risk woman aged 26 with normal results, what is the recommended cervical screening interval if cytology alone is used?
- Every 5 years
- Every 3 years
- Every 6 months
- Every year
Correct answer: Every 3 years
Every 3 years is the answer because cytology alone in women aged 21 to 29 is repeated at three-year intervals when results are normal. Annual screening causes overtesting. Every six months is far too frequent. A five-year interval applies to co-testing or primary human papillomavirus testing in women 30 and older, not cytology alone in this age group.
- A 38-year-old average-risk woman with normal prior results wants the longest guideline-supported screening interval. Which strategy allows a 5-year interval?
- Annual pelvic examination alone
- Co-testing with cytology and high-risk human papillomavirus testing
- Visual inspection with acetic acid
- Cytology alone
Correct answer: Co-testing with cytology and high-risk human papillomavirus testing
Co-testing is correct because combining cytology with high-risk human papillomavirus testing, or primary human papillomavirus testing, in women aged 30 to 65 permits a five-year interval when results are normal. Cytology alone allows only a three-year interval. Visual inspection with acetic acid is not a standard method in this setting. A pelvic examination alone is not cervical cancer screening.
- At what age can cervical cancer screening generally be stopped in an average-risk woman with adequate prior negative screening and no history of high-grade disease?
Correct answer: Age 65
Stopping at age 65 is correct because screening can be discontinued after 65 in average-risk women with adequate prior negative results and no high-grade history. Stopping at 55 or 60 is too early and could miss disease. Continuing to 70 is unnecessary once criteria to stop at 65 are met.
- A 30-year-old woman had a total hysterectomy with cervix removal for benign leiomyomas and has no history of high-grade dysplasia. What is the appropriate recommendation for cervical cytology?
- Begin five-year co-testing
- Perform cytology every 6 months
- Continue annual Pap tests indefinitely
- Cervical cancer screening can be discontinued
Correct answer: Cervical cancer screening can be discontinued
Discontinuing screening is correct because a woman who has had her cervix removed for benign disease and has no high-grade history has no cervix to screen and does not need further cytology. Continuing annual Pap tests is unnecessary. Frequent testing of an absent cervix is not indicated. Co-testing also requires a cervix to sample.
- A 33-year-old woman has a Pap result of atypical squamous cells of undetermined significance with a positive high-risk human papillomavirus test. What is the most appropriate next step?
- Colposcopy
- No further evaluation
- Repeat cytology in 5 years
- Immediate hysterectomy
Correct answer: Colposcopy
Colposcopy is the answer because atypical squamous cells with a positive high-risk human papillomavirus test indicate increased risk of significant dysplasia, warranting colposcopic evaluation and biopsy. A five-year repeat ignores the elevated risk. No evaluation would miss potential high-grade disease. Hysterectomy is far too aggressive for an unconfirmed lesion.
- Which factor is responsible for nearly all cervical cancers and is the target of both screening and vaccination?
- Unopposed estrogen exposure
- Uterine leiomyomas
- Persistent infection with high-risk human papillomavirus types
- Chronic bacterial vaginosis
Correct answer: Persistent infection with high-risk human papillomavirus types
Persistent high-risk human papillomavirus infection is correct because nearly all cervical cancers arise from persistent infection with oncogenic human papillomavirus types, which is why screening detects related changes and vaccination targets these strains. Bacterial vaginosis does not cause cervical cancer. Unopposed estrogen is linked to endometrial, not cervical, cancer. Leiomyomas are benign and unrelated.
- At what gestational age is universal screening for group B streptococcus colonization performed using a vaginal-rectal culture?
- 20 to 22 weeks
- 28 to 30 weeks
- 10 to 12 weeks
- 36 to 37 weeks
Correct answer: 36 to 37 weeks
Screening at 36 to 37 weeks is correct because a vaginal-rectal culture in this late window best predicts colonization status at delivery for intrapartum prophylaxis decisions. The 10 to 12 week and 20 to 22 week windows are far too early. The 28 to 30 week window is also too early to reliably predict labor-time status.
- A woman screens positive for group B streptococcus colonization at 36 weeks. What is the appropriate intervention when she presents in labor?
- Intravenous penicillin during labor
- Cesarean delivery to prevent transmission
- A single oral antibiotic dose two weeks before delivery
- No treatment because colonization is harmless
Correct answer: Intravenous penicillin during labor
Intravenous penicillin during labor is correct because intrapartum antibiotic prophylaxis reduces early-onset neonatal group B strep disease, and treating during labor is what protects the newborn. Withholding treatment leaves the neonate at risk. Antibiotics weeks before delivery do not prevent recolonization by labor. Cesarean delivery is not used to prevent group B strep transmission.
- A laboring woman with a positive group B streptococcus screen reports a history of anaphylaxis to penicillin, and susceptibility testing confirms the organism is sensitive to clindamycin. Which agent is the appropriate prophylaxis?
- A penicillin rechallenge
- Acyclovir
- Metronidazole
- Clindamycin
Correct answer: Clindamycin
Clindamycin is the answer because, with a severe penicillin allergy and confirmed susceptibility, clindamycin is an appropriate alternative for group B strep prophylaxis, while vancomycin is used if susceptibility is not established. A penicillin rechallenge risks anaphylaxis. Metronidazole targets anaerobes and protozoa, not group B strep. Acyclovir is an antiviral with no role here.
- A woman at 39 weeks presents in labor with unknown group B streptococcus status and a temperature of 38.6 degrees Celsius. What is the appropriate management for group B strep?
- Provide intrapartum antibiotic prophylaxis
- Provide no intervention
- Proceed directly to cesarean delivery
- Withhold antibiotics until culture results return
Correct answer: Provide intrapartum antibiotic prophylaxis
Providing intrapartum prophylaxis is correct because intrapartum fever with unknown group B strep status meets risk-based criteria for empiric antibiotics to protect the newborn. Waiting for culture results would delay needed protection. Cesarean delivery is not the intervention for group B strep. Doing nothing leaves the neonate unprotected against a treatable risk.
- Why is intrapartum rather than antepartum antibiotic administration the standard for preventing early-onset neonatal group B streptococcal disease?
- It maintains protective drug levels as the neonate passes through the colonized birth canal
- Antepartum treatment permanently eradicates maternal colonization
- Early-onset disease occurs only weeks after birth
- Oral antibiotics are more effective than intravenous ones
Correct answer: It maintains protective drug levels as the neonate passes through the colonized birth canal
Maintaining protective levels during labor is correct because intrapartum antibiotics ensure adequate drug concentrations as the neonate passes through the colonized birth canal, which is when transmission occurs. Intravenous, not oral, dosing is standard. Antepartum treatment does not durably eradicate colonization because recolonization is common. Early-onset disease occurs within the first week, not weeks later.
- A pregnant woman previously had an infant with invasive group B streptococcal disease. What is the recommended approach in the current pregnancy?
- Screen and treat only if she is febrile in labor
- Provide intrapartum antibiotic prophylaxis regardless of current culture results
- Cesarean delivery to avoid prophylaxis
- Skip prophylaxis because the prior infant recovered
Correct answer: Provide intrapartum antibiotic prophylaxis regardless of current culture results
Providing prophylaxis regardless of current culture is correct because a prior infant with invasive group B strep disease is itself an indication for intrapartum antibiotics in subsequent pregnancies without needing a new culture. Cesarean delivery is not used to prevent transmission. The prior infant's recovery does not remove the risk to the new baby. Waiting for fever would miss the established indication.
- A woman with a documented group B streptococcus bacteriuria identified earlier in the current pregnancy is now in labor. What is the appropriate management for group B strep?
- Treat only if the 36-week culture is positive
- Provide intrapartum antibiotic prophylaxis based on the bacteriuria
- Perform cesarean delivery
- No prophylaxis is needed because bacteriuria was already treated
Correct answer: Provide intrapartum antibiotic prophylaxis based on the bacteriuria
Providing prophylaxis based on the bacteriuria is correct because group B streptococcus bacteriuria during the current pregnancy indicates heavy colonization and is an automatic indication for intrapartum prophylaxis regardless of a later culture. Waiting for a 36-week culture is unnecessary when bacteriuria is documented. Prior treatment of the bacteriuria does not eliminate the labor-time indication. Cesarean delivery is not the appropriate intervention.
- A 27-year-old woman with a small unruptured ectopic pregnancy and a beta-hCG of 1,200 mIU/mL that has been spontaneously declining over several days remains asymptomatic and stable. Which management approach may be appropriate in carefully selected patients like her?
- Immediate salpingectomy
- Expectant management with close beta-hCG monitoring
- Emergent blood transfusion
- High-dose multidose chemotherapy
Correct answer: Expectant management with close beta-hCG monitoring
Expectant management with close monitoring is correct because a stable, asymptomatic patient with a low and already declining beta-hCG may be observed with serial measurements, as some early ectopic pregnancies resolve on their own. Immediate salpingectomy is unnecessarily aggressive for a resolving ectopic. High-dose multidose chemotherapy is excessive for a spontaneously falling low-level pregnancy. Transfusion is reserved for significant blood loss, which is absent here.
- A laboring patient at term has a fetal heart rate baseline of 145 beats per minute with frequent accelerations but suddenly develops a single prolonged deceleration to 80 beats per minute lasting 3 minutes after an epidural bolus. Her blood pressure is now 84/50 mm Hg. Which intervention most directly addresses the likely cause?
- Give an intravenous fluid bolus and reposition the mother to correct hypotension
- Increase the oxytocin infusion
- Administer magnesium sulfate
- Proceed immediately to forceps delivery
Correct answer: Give an intravenous fluid bolus and reposition the mother to correct hypotension
An intravenous fluid bolus with repositioning is correct because epidural-induced maternal hypotension reduces uteroplacental perfusion and causes a prolonged deceleration, so restoring maternal blood pressure addresses the underlying cause. Increasing oxytocin would worsen fetal stress. Immediate forceps delivery is premature before attempting intrauterine resuscitation. Magnesium sulfate does not treat hypotension-related decelerations.
- A 33-year-old woman at 38 weeks with preeclampsia is being monitored. Which laboratory or clinical change would most clearly indicate progression to severe features requiring escalation of care?
- A platelet count that drops below 100,000
- A hemoglobin rise of 0.2 g/dL
- A blood pressure of 134/86 mm Hg
- Mild dependent edema of the ankles
Correct answer: A platelet count that drops below 100,000
A platelet count below 100,000 is correct because thrombocytopenia is an end-organ feature that defines preeclampsia with severe features and warrants escalation. Mild ankle edema is nonspecific and common in pregnancy. A trivial hemoglobin rise is not a severe feature. A blood pressure of 134/86 is below the diagnostic threshold for severe-range hypertension.
- A woman with postpartum hemorrhage from atony has failed uterotonics and balloon tamponade and remains unstable in the operating room, but she strongly desires future fertility. Which uterus-sparing surgical option may be attempted before hysterectomy?
- Cervical cerclage placement
- Bilateral oophorectomy
- Total abdominal hysterectomy
- A uterine compression suture such as a B-Lynch suture
Correct answer: A uterine compression suture such as a B-Lynch suture
A uterine compression suture such as a B-Lynch suture is correct because it mechanically compresses the uterus to control atonic bleeding and can preserve the uterus and future fertility before resorting to hysterectomy. Bilateral oophorectomy does not stop uterine bleeding and removes the ovaries. Hysterectomy is the last resort that ends fertility. Cervical cerclage is used to prevent preterm birth, not to control postpartum hemorrhage.
- A 35-year-old man with major depressive disorder has taken sertraline at a maximal dose for 8 weeks with only minimal improvement and good adherence. He tolerates the medication well. According to a measurement-based stepwise approach, which next step is most appropriate?
- Switch to or augment with a different antidepressant
- Continue the same dose unchanged for another 8 weeks
- Add a stimulant for energy
- Refer immediately for electroconvulsive therapy
Correct answer: Switch to or augment with a different antidepressant
The most appropriate next step is to switch to or augment with a different antidepressant. After an adequate trial at a therapeutic dose without sufficient response, guidelines support either switching agents or adding an augmenting agent; continuing an ineffective dose unchanged wastes time, and electroconvulsive therapy is reserved for severe or treatment-resistant disease.
- A 50-year-old woman is started on fluoxetine for major depressive disorder. Her clinician explains that during the first 1 to 2 weeks she may notice physical activation and improved sleep and appetite before her mood lifts. Why does this temporal pattern create a specific safety concern early in treatment?
- The drug causes immediate euphoria that masks depression
- Energy and motivation may improve before mood, transiently increasing the capacity to act on suicidal thoughts
- Sleep improvement always indicates the depression has resolved
- Appetite return signals that the dose is too high
Correct answer: Energy and motivation may improve before mood, transiently increasing the capacity to act on suicidal thoughts
The concern is that energy and motivation may improve before mood, transiently increasing the capacity to act on suicidal thoughts. Because neurovegetative symptoms such as psychomotor retardation can improve before the core depressed mood, a still-suicidal patient may gain the drive to act, which is why early close follow-up is advised.
- A 41-year-old woman taking paroxetine for depression stops it abruptly while traveling and 2 days later develops dizziness, nausea, irritability, flu-like aches, and brief electric-shock sensations. Her symptoms resolve when the drug is restarted. What does this represent?
- A relapse of major depression
- Serotonin syndrome
- Antidepressant discontinuation syndrome
- A new generalized anxiety disorder
Correct answer: Antidepressant discontinuation syndrome
This represents antidepressant discontinuation syndrome. Abrupt cessation of a short-half-life SSRI such as paroxetine produces dizziness, gastrointestinal upset, flu-like symptoms, and paresthesias often described as electric shocks; it resolves with reinstatement and is prevented by tapering.
- A 33-year-old woman taking an SSRI for depression is found to have a serum sodium of 124 mEq/L with euvolemia, low serum osmolality, and inappropriately concentrated urine. She is otherwise well. Which adverse effect of SSRIs does this most likely represent?
- Diabetes insipidus
- Adrenal insufficiency
- Psychogenic polydipsia
- SSRI-induced syndrome of inappropriate antidiuretic hormone secretion
Correct answer: SSRI-induced syndrome of inappropriate antidiuretic hormone secretion
This most likely represents SSRI-induced syndrome of inappropriate antidiuretic hormone secretion. SSRIs can cause hyponatremia through SIADH, particularly in older adults, producing euvolemic hyponatremia with low serum osmolality and inappropriately concentrated urine.
- A 58-year-old man with major depressive disorder and stable coronary artery disease needs an antidepressant. Which agent is generally regarded as a preferred first choice because of its favorable cardiac safety profile?
- Sertraline
- Amitriptyline
- Nortriptyline
- Phenelzine
Correct answer: Sertraline
Sertraline is generally a preferred choice in patients with coronary artery disease because of its favorable cardiac safety profile. Tricyclics carry conduction and arrhythmia risk, while sertraline has well-established safety data in patients with cardiac disease.
- A clinician is selecting an antidepressant and notes that one option may prolong the QT interval in a dose-dependent fashion, prompting caution at higher doses and in patients with conduction risk. Which SSRI is most associated with this concern?
- Fluoxetine
- Citalopram
- Sertraline
- Fluvoxamine
Correct answer: Citalopram
Citalopram is most associated with dose-dependent QT prolongation. Because of this, maximal daily doses are limited, particularly in older adults and those with cardiac conduction abnormalities, and the QT interval is monitored when higher doses are used.
- A 29-year-old woman has had depressed mood most of the day, more days than not, for the past 3 years, with poor appetite, low energy, and low self-esteem but no period of full remission lasting more than a couple of months and no manic episodes. Which diagnosis best fits this chronic, lower-grade presentation?
- Major depressive disorder, single episode
- Adjustment disorder with depressed mood
- Persistent depressive disorder (dysthymia)
- Cyclothymic disorder
Correct answer: Persistent depressive disorder (dysthymia)
The diagnosis is persistent depressive disorder, also called dysthymia. Depressed mood for most of the day, more days than not, lasting at least 2 years with associated symptoms but without sustained remission characterizes this chronic, lower-intensity depressive condition.
- A 24-year-old man with severe alcohol use disorder is admitted for withdrawal. On hospital day 2 he develops confusion, a gait disturbance, and abnormal eye movements with horizontal gaze-evoked nystagmus. Which deficiency-related condition does this triad suggest?
- Niacin deficiency (pellagra)
- Vitamin B12 deficiency
- Folate deficiency
- Wernicke encephalopathy from thiamine deficiency
Correct answer: Wernicke encephalopathy from thiamine deficiency
The triad of confusion, ataxia, and ophthalmoplegia suggests Wernicke encephalopathy from thiamine deficiency. This acute, reversible syndrome is common in alcohol use disorder and is treated urgently with high-dose thiamine to prevent progression to irreversible Korsakoff amnesia.
- A 47-year-old man recovering from severe alcohol withdrawal is noted to have profound, fixed anterograde amnesia with confabulation but a clear sensorium and preserved attention. Which condition does this represent?
- Korsakoff syndrome
- Delirium tremens
- Alcoholic hallucinosis
- Hepatic encephalopathy
Correct answer: Korsakoff syndrome
This represents Korsakoff syndrome. It is the chronic amnestic disorder that can follow untreated Wernicke encephalopathy, characterized by anterograde amnesia and confabulation with otherwise preserved consciousness, distinguishing it from the fluctuating sensorium of delirium tremens.
- A 38-year-old man with daily heavy drinking is admitted after his last drink. The team must decide on a benzodiazepine dosing strategy. Compared with a fixed-schedule regimen, what is the principal advantage of a symptom-triggered regimen guided by a validated withdrawal scale in an appropriately monitored patient?
- It eliminates any need to monitor the patient
- It generally reduces total benzodiazepine exposure and treatment duration
- It guarantees seizures will not occur
- It allows oral medication to be avoided entirely
Correct answer: It generally reduces total benzodiazepine exposure and treatment duration
The principal advantage is that symptom-triggered dosing generally reduces total benzodiazepine exposure and treatment duration. By giving medication only when objective withdrawal severity crosses a threshold, monitored patients receive less cumulative drug and shorter courses than with fixed scheduling, while still preventing complications.
- A 55-year-old hospitalized man with alcohol use disorder is being managed for withdrawal with lorazepam. He has electrolyte studies drawn. Correcting which commonly depleted electrolyte is important because its deficiency can contribute to refractory withdrawal and cardiac arrhythmias?
- Calcium
- Chloride
- Magnesium
- Bicarbonate
Correct answer: Magnesium
Correcting magnesium is important because hypomagnesemia is common in alcohol use disorder and can contribute to refractory withdrawal symptoms and cardiac arrhythmias. Repleting magnesium, along with thiamine and other deficiencies, supports safe withdrawal management.
- A patient on disulfiram for alcohol use disorder maintenance drinks alcohol and rapidly develops flushing, throbbing headache, nausea, vomiting, palpitations, and hypotension. Which mechanism explains this reaction?
- Blockade of opioid receptors reducing reward
- Restoration of GABA-A receptor tone
- Glutamate receptor antagonism
- Inhibition of aldehyde dehydrogenase leading to acetaldehyde accumulation
Correct answer: Inhibition of aldehyde dehydrogenase leading to acetaldehyde accumulation
The reaction results from inhibition of aldehyde dehydrogenase leading to acetaldehyde accumulation. Disulfiram blocks the enzyme that metabolizes acetaldehyde, so drinking alcohol causes a buildup that produces the aversive flushing, headache, nausea, and cardiovascular symptoms.
- A 44-year-old woman with alcohol use disorder and no liver disease wants medication to reduce her craving and heavy drinking. She is not currently taking opioids. Which agent acts as an opioid receptor antagonist to decrease the rewarding effects of alcohol?
- Naltrexone
- Acamprosate
- Topiramate
- Gabapentin
Correct answer: Naltrexone
Naltrexone acts as an opioid receptor antagonist to decrease the rewarding effects of alcohol. It reduces heavy drinking and craving and can be started while a patient is still drinking, but it must be avoided in patients taking opioids because it precipitates withdrawal.
- During a routine clinic visit, a clinician wants to screen an adult patient for problematic alcohol use using a brief validated instrument. Which screening tool is specifically designed for this purpose?
- The CIWA-Ar scale
- The CAGE questionnaire
- The Glasgow Coma Scale
- The Mini-Mental State Examination
Correct answer: The CAGE questionnaire
The CAGE questionnaire is a brief validated screening tool for problematic alcohol use, asking about cutting down, annoyance at criticism, guilt, and eye-opener drinking. The CIWA-Ar instead grades the severity of active withdrawal and is not a screening test.
- A 49-year-old man in alcohol withdrawal has a witnessed brief generalized tonic-clonic seizure 18 hours after his last drink, with a rapid return to baseline and a nonfocal neurologic exam. He has had similar uncomplicated withdrawal seizures before. What is the most appropriate management of the seizure itself?
- Start long-term phenytoin for seizure prophylaxis
- Begin levetiracetam indefinitely
- Treat the underlying withdrawal with adequate benzodiazepines
- Withhold all benzodiazepines to avoid sedation
Correct answer: Treat the underlying withdrawal with adequate benzodiazepines
The most appropriate management is to treat the underlying withdrawal with adequate benzodiazepines. Alcohol withdrawal seizures are driven by the withdrawal state itself and respond to benzodiazepines, which also prevent recurrence; long-term antiepileptics such as phenytoin are not effective for this indication.
- A 72-year-old woman recovering from pneumonia in the hospital becomes intermittently confused, more so in the evenings. The team uses a brief validated bedside instrument to confirm delirium by assessing acute onset and fluctuating course, inattention, disorganized thinking, and altered level of consciousness. Which instrument is this?
- Hamilton Depression Rating Scale
- Geriatric Depression Scale
- Glasgow Coma Scale
- Confusion Assessment Method
Correct answer: Confusion Assessment Method
This is the Confusion Assessment Method. It diagnoses delirium when there is acute onset with a fluctuating course and inattention, plus either disorganized thinking or an altered level of consciousness, making it a standard validated bedside screen.
- A 65-year-old man undergoing major surgery has several modifiable factors that raise his risk of postoperative delirium. Which evidence-based bundle of nonpharmacologic measures best reduces the incidence of delirium in hospitalized older adults?
- Reorientation, early mobilization, sleep-wake normalization, and sensory aids
- Prophylactic scheduled antipsychotics for all patients
- Strict bed rest and continuous sedation
- Routine use of physical restraints
Correct answer: Reorientation, early mobilization, sleep-wake normalization, and sensory aids
The best approach is a multicomponent bundle of reorientation, early mobilization, sleep-wake normalization, and provision of sensory aids such as glasses and hearing aids. These nonpharmacologic interventions reduce delirium incidence, whereas restraints, oversedation, and prophylactic antipsychotics are not recommended.
- An 80-year-old woman with mild cognitive complaints is evaluated in clinic for slowly progressive memory loss over 3 years. She is fully alert with normal attention. To distinguish a primary dementia from delirium, which feature would argue against delirium in this case?
- Acutely clouded consciousness
- Stable attention and a clear sensorium with gradual progression
- Hour-to-hour fluctuation in alertness
- Onset over 24 hours after a new medication
Correct answer: Stable attention and a clear sensorium with gradual progression
Stable attention and a clear sensorium with gradual progression argue against delirium. Delirium is defined by acute, fluctuating inattention and altered consciousness, so their absence in a slowly progressive course points toward a primary dementia rather than delirium.
- A hospitalized 77-year-old man with delirium has agitation that is endangering himself and staff, and nonpharmacologic measures have failed. He has a baseline prolonged QTc. Before giving an antipsychotic such as haloperidol for severe agitation, which precaution is most important?
- Administer a large benzodiazepine dose first
- Withhold all treatment until the QTc normalizes on its own
- Confirm and monitor the QT interval because antipsychotics can further prolong it
- Give an anticholinergic to prevent dystonia
Correct answer: Confirm and monitor the QT interval because antipsychotics can further prolong it
The most important precaution is to confirm and monitor the QT interval because antipsychotics can further prolong it. Haloperidol and similar agents can worsen QTc prolongation and risk torsades de pointes, so the electrocardiogram and electrolytes should be assessed when using them in a patient with a baseline prolonged QTc.
- A 68-year-old man recovering from delirium asks about his prognosis. Which statement most accurately reflects the clinical significance of an episode of delirium in a hospitalized older adult?
- Delirium has no impact on outcomes once it resolves
- Delirium always resolves completely within a few hours
- Delirium confirms an irreversible dementia in every patient
- Delirium is associated with longer hospital stays and increased mortality and may precede cognitive decline
Correct answer: Delirium is associated with longer hospital stays and increased mortality and may precede cognitive decline
Delirium is associated with longer hospital stays and increased mortality and may precede cognitive decline. Although often reversible, an episode signals serious illness and vulnerability, carries worse short-term outcomes, and is linked to subsequent cognitive impairment.
- A 70-year-old woman is admitted with acute confusion. While searching for a precipitant, the team reviews a mnemonic-based differential of common reversible causes of delirium. Which of the following is a frequently identified, readily reversible contributor that should be checked early?
- Urinary tract infection
- Long-standing hyperlipidemia
- A remote history of a healed fracture
- Well-controlled essential tremor
Correct answer: Urinary tract infection
A urinary tract infection is a frequently identified, readily reversible contributor to delirium and should be checked early. Infections, along with metabolic derangements, hypoxia, medications, and urinary retention or constipation, are common precipitants whose correction can resolve the delirium.
- A 30-year-old man on chronic lithium has had stable levels for years. He develops worsening tremor and a level of 1.8 mEq/L after a primary care visit. Which newly added over-the-counter or prescribed medication most likely contributed by reducing renal lithium clearance?
- Acetaminophen
- A nonsteroidal anti-inflammatory drug
- An inhaled corticosteroid
- A proton pump inhibitor
Correct answer: A nonsteroidal anti-inflammatory drug
A nonsteroidal anti-inflammatory drug most likely contributed by reducing renal lithium clearance. NSAIDs decrease renal blood flow and enhance proximal lithium reabsorption, raising serum levels; ACE inhibitors and thiazides do the same, so these agents require caution and monitoring in lithium-treated patients.
- A 40-year-old woman on lithium for bipolar disorder is found on routine monitoring to have a new elevated TSH with low free thyroxine and fatigue. Which long-term endocrine adverse effect of lithium does this represent?
- Hyperthyroidism
- Cushing syndrome
- Hypothyroidism
- Adrenal insufficiency
Correct answer: Hypothyroidism
This represents hypothyroidism, a recognized long-term adverse effect of lithium. Lithium can impair thyroid hormone synthesis and release, producing an elevated TSH with low free thyroxine, which is why periodic thyroid function testing is part of maintenance monitoring.
- A patient on a stable lithium dose presents with confusion and a level of 2.2 mEq/L. The team distinguishes acute from chronic toxicity. Which statement correctly contrasts chronic lithium toxicity with acute overdose?
- Chronic toxicity causes mainly gastrointestinal symptoms with no neurologic findings
- Acute overdose never causes gastrointestinal symptoms
- Chronic toxicity is always asymptomatic
- Chronic toxicity often produces prominent neurologic symptoms at levels lower than those causing symptoms in acute overdose
Correct answer: Chronic toxicity often produces prominent neurologic symptoms at levels lower than those causing symptoms in acute overdose
Chronic toxicity often produces prominent neurologic symptoms at levels lower than those causing symptoms in acute overdose. In chronic toxicity, lithium has had time to distribute into tissues including the brain, so neurotoxicity can appear even at modestly elevated levels, whereas acute ingestion initially shows gastrointestinal symptoms before neurologic effects.
- A 36-year-old woman on lithium develops moderate toxicity with a level of 2.5 mEq/L, tremor, and ataxia, and good renal function. Initial management before deciding on dialysis includes which intervention?
- Intravenous normal saline to restore volume and enhance renal lithium excretion
- A loop diuretic to force lithium out
- Oral activated charcoal as the definitive treatment
- Intravenous potassium chloride
Correct answer: Intravenous normal saline to restore volume and enhance renal lithium excretion
Initial management includes intravenous normal saline to restore volume and enhance renal lithium excretion. Adequate hydration corrects any volume depletion and supports clearance of this renally eliminated ion; activated charcoal does not bind lithium and diuretics can worsen toxicity.
- A patient maintained on lithium develops gradual onset of polyuria and nocturia. Laboratory testing shows dilute urine. Beyond stopping or reducing lithium when possible, which agent is used to treat lithium-induced nephrogenic diabetes insipidus by acting on the distal nephron?
- Furosemide
- Amiloride
- Desmopressin
- Acetazolamide
Correct answer: Amiloride
Amiloride is used to treat lithium-induced nephrogenic diabetes insipidus. By blocking the epithelial sodium channel in the collecting duct, amiloride reduces lithium entry into principal cells and improves urinary concentrating ability; desmopressin is ineffective because the defect is renal resistance to antidiuretic hormone.
- A 28-year-old woman with bipolar disorder maintained on lithium is breastfeeding her newborn. Which counseling point reflects the recognized concern with lithium during breastfeeding?
- Lithium is not excreted in breast milk and poses no infant risk
- Lithium improves infant feeding and is encouraged
- Lithium is concentrated in breast milk and the infant requires monitoring or an alternative may be considered
- Breastfeeding raises maternal lithium levels to toxic ranges
Correct answer: Lithium is concentrated in breast milk and the infant requires monitoring or an alternative may be considered
Lithium is excreted into breast milk and infants can develop measurable levels, so the infant requires monitoring or an alternative may be considered. Because of immature neonatal renal clearance, the risk of infant toxicity must be weighed against the benefits of breastfeeding and maternal mood stability.
- A 32-year-old man with bipolar I disorder presents with a sustained elevated and irritable mood, decreased need for sleep, and risky behavior, but reports no hallucinations or delusions and remains in contact with reality. He requires acute pharmacotherapy. Which option is an appropriate first-line monotherapy for acute mania without psychotic features?
- Fluoxetine
- Propranolol
- Diphenhydramine
- Lithium
Correct answer: Lithium
Lithium is an appropriate first-line monotherapy for acute mania without psychotic features. It is a foundational mood stabilizer effective for acute mania and maintenance; antidepressants such as fluoxetine are avoided because they can worsen or precipitate mania.
- A 26-year-old woman reports at least 2 years of numerous periods of hypomanic symptoms and numerous periods of mild depressive symptoms that never reached the threshold for a full hypomanic, manic, or major depressive episode. Which diagnosis best fits this chronic, fluctuating mood pattern?
- Cyclothymic disorder
- Bipolar I disorder
- Major depressive disorder
- Persistent depressive disorder
Correct answer: Cyclothymic disorder
The diagnosis is cyclothymic disorder. It is characterized by at least 2 years of fluctuating subthreshold hypomanic and depressive symptoms that do not meet criteria for full mood episodes, representing a chronic milder bipolar-spectrum condition.
- A 38-year-old man with bipolar disorder has a distinct period of elevated mood, increased energy, and decreased need for sleep lasting 5 days that is noticeable to others but does not cause marked impairment, require hospitalization, or include psychotic features. Which type of mood episode does this describe?
- Manic episode
- Hypomanic episode
- Major depressive episode
- Mixed catatonic episode
Correct answer: Hypomanic episode
This describes a hypomanic episode. Hypomania involves elevated or irritable mood with increased energy lasting at least 4 days, observable by others, but without the marked functional impairment, hospitalization, or psychotic features that define a manic episode.
- A patient starting lamotrigine for maintenance treatment of bipolar disorder is counseled to seek immediate care if a rash develops. Which serious dermatologic reaction is the basis for the slow titration schedule of lamotrigine?
- Acne vulgaris
- Seborrheic dermatitis
- Stevens-Johnson syndrome
- Contact dermatitis
Correct answer: Stevens-Johnson syndrome
The basis for slow titration is the risk of Stevens-Johnson syndrome. Rapid dose escalation of lamotrigine increases the chance of this life-threatening rash, so the medication is titrated gradually and any developing rash prompts urgent evaluation.
- A 30-year-old man with bipolar disorder is hospitalized for a severe manic episode with grandiose delusions. The team chooses valproate plus an antipsychotic. Which baseline test should be obtained in a patient of reproductive potential, and which counseling is appropriate given valproate's risks?
- Routine baseline electroencephalography
- Baseline bone density scanning
- Screening colonoscopy before starting
- Pregnancy testing and counseling about teratogenic neural tube defect risk
Correct answer: Pregnancy testing and counseling about teratogenic neural tube defect risk
Pregnancy testing and counseling about teratogenic neural tube defect risk are appropriate. Valproate is teratogenic and associated with neural tube defects and impaired neurodevelopment, so reproductive potential must be addressed before use and effective contraception or an alternative considered.
- A 45-year-old woman taking an antidepressant and the antibiotic linezolid develops within hours agitation, tachycardia, diaphoresis, tremor, and spontaneous clonus. Which property of linezolid explains why combining it with a serotonergic antidepressant precipitated this syndrome?
- It is a monoamine oxidase inhibitor
- It blocks dopamine receptors
- It inhibits acetylcholinesterase
- It is an opioid agonist
Correct answer: It is a monoamine oxidase inhibitor
Linezolid is a monoamine oxidase inhibitor, which explains the reaction. Its MAO-inhibiting activity raises synaptic serotonin, and when combined with a serotonergic antidepressant it can precipitate serotonin syndrome, marked here by autonomic instability and neuromuscular hyperactivity with clonus.
- A patient with suspected serotonin syndrome is being evaluated. Which clinically applied diagnostic framework relies on a history of serotonergic drug exposure plus findings such as spontaneous or inducible clonus, agitation, diaphoresis, and hyperthermia?
- The Light criteria
- The Hunter criteria
- The Ranson criteria
- The Centor criteria
Correct answer: The Hunter criteria
The Hunter criteria are used to diagnose serotonin syndrome. In the setting of a serotonergic agent, findings such as spontaneous clonus, inducible or ocular clonus with agitation or diaphoresis, tremor with hyperreflexia, or hypertonia with hyperthermia support the diagnosis.
- A clinician is switching a patient from a monoamine oxidase inhibitor to an SSRI. Which step is essential to reduce the risk of serotonin syndrome during the transition?
- Start both drugs together for a smoother transition
- Double the SSRI starting dose to overcome residual inhibition
- Observe an adequate washout period between the two medications
- Add a second serotonergic agent during the switch
Correct answer: Observe an adequate washout period between the two medications
An adequate washout period between the two medications is essential. Because monoamine oxidase inhibitors have prolonged effects, a drug-free interval is required before starting an SSRI to avoid overlapping serotonergic activity and precipitating serotonin syndrome.
- A 21-year-old man is brought to the emergency department after recreational drug use combined with his prescribed antidepressant. He has agitation, hyperthermia, tachycardia, and lower-extremity-predominant clonus. Which recreational drug is a well-known serotonergic precipitant in this scenario?
- Cocaine via vasoconstriction alone
- Inhaled nitrous oxide
- Anabolic steroids
- MDMA (ecstasy)
Correct answer: MDMA (ecstasy)
MDMA, also known as ecstasy, is a well-known serotonergic precipitant. It markedly increases serotonin release, so combining it with a serotonergic antidepressant can produce serotonin syndrome with autonomic instability and the characteristic neuromuscular hyperexcitability.
- While caring for a patient with serotonin syndrome and agitation, the team needs an agent that controls agitation and muscle hyperactivity and helps reduce hyperthermia as part of supportive care. Which medication class serves this role?
- Benzodiazepines
- Typical antipsychotics with anticholinergic activity
- Beta-agonists
- Stimulants
Correct answer: Benzodiazepines
Benzodiazepines serve this role in serotonin syndrome. They control agitation and reduce muscle hyperactivity, which helps lower heat generation and temperature, and they are a mainstay of supportive care alongside discontinuing serotonergic agents and active cooling.
- A 60-year-old man taking an antipsychotic for 3 days for delirium develops fever, severe rigidity, and confusion. The team distinguishes neuroleptic malignant syndrome from malignant hyperthermia. Which feature points specifically to malignant hyperthermia rather than neuroleptic malignant syndrome?
- Onset over several days after a dopamine antagonist
- Onset within minutes of exposure to a volatile anesthetic or succinylcholine
- Triggering by abrupt withdrawal of dopaminergic medication
- Response specifically to bromocriptine
Correct answer: Onset within minutes of exposure to a volatile anesthetic or succinylcholine
Onset within minutes of exposure to a volatile anesthetic or succinylcholine points to malignant hyperthermia. That syndrome is triggered intraoperatively by specific anesthetic agents in genetically susceptible patients, whereas neuroleptic malignant syndrome develops over days after a dopamine antagonist.
- A patient with neuroleptic malignant syndrome has a markedly elevated creatine kinase and dark urine. Which serious complication of the syndrome must be anticipated and prevented with aggressive intravenous fluids?
- Acute pancreatitis
- Diabetic ketoacidosis
- Myoglobinuric acute kidney injury from rhabdomyolysis
- Acute cholecystitis
Correct answer: Myoglobinuric acute kidney injury from rhabdomyolysis
Myoglobinuric acute kidney injury from rhabdomyolysis must be anticipated. The intense muscle breakdown releases myoglobin that can injure the kidneys, so aggressive intravenous hydration is given to maintain urine output and protect renal function.
- A 25-year-old man with schizophrenia is being treated with a high-potency first-generation antipsychotic when he develops neuroleptic malignant syndrome. Which factor is recognized as increasing the risk of developing this syndrome?
- Use of a low dose of a sedating antidepressant
- Chronic stable dosing of an SSRI
- Treatment with a beta-blocker
- Use of a high-potency dopamine antagonist and rapid dose escalation
Correct answer: Use of a high-potency dopamine antagonist and rapid dose escalation
Use of a high-potency dopamine antagonist and rapid dose escalation increases the risk of neuroleptic malignant syndrome. Greater dopamine blockade, parenteral administration, dehydration, and agitation also contribute, reflecting the syndrome's basis in abrupt central dopamine antagonism.
- A patient recovering from neuroleptic malignant syndrome will require continued treatment for psychosis. Beyond using a lower-potency agent at a low dose after a recovery interval, which additional precaution reduces recurrence risk during rechallenge?
- Ensure adequate hydration and monitor temperature, vital signs, and creatine kinase
- Restart the same high-potency agent immediately at full dose
- Combine two antipsychotics to lower each dose
- Avoid all monitoring to reduce patient stress
Correct answer: Ensure adequate hydration and monitor temperature, vital signs, and creatine kinase
Ensuring adequate hydration and monitoring temperature, vital signs, and creatine kinase reduces recurrence risk. Careful surveillance during a slow rechallenge with a lower-potency agent allows early detection of recurring rigidity or hyperthermia so treatment can be stopped promptly.
- A patient develops neuroleptic malignant syndrome and the team explains the mechanism to trainees. Which receptor action of antipsychotics underlies the development of this syndrome?
- Agonism at serotonin 5-HT2A receptors
- Blockade of central dopamine D2 receptors
- Blockade of muscarinic acetylcholine receptors
- Agonism at GABA-A receptors
Correct answer: Blockade of central dopamine D2 receptors
Blockade of central dopamine D2 receptors underlies neuroleptic malignant syndrome. Reduced dopaminergic signaling in the hypothalamus and basal ganglia produces impaired thermoregulation and muscle rigidity, which is why dopamine agonists such as bromocriptine are used in treatment.
- A 19-year-old man has had social withdrawal, declining grades, and odd beliefs for 4 months, followed by 2 weeks of frank auditory hallucinations and paranoid delusions, with total symptom duration of about 4.5 months and significant functional decline. No mood episode explains the picture. Which diagnosis best fits the duration?
- Brief psychotic disorder
- Schizophrenia
- Schizophreniform disorder
- Delusional disorder
Correct answer: Schizophreniform disorder
The diagnosis is schizophreniform disorder. Psychotic symptoms with associated impairment lasting at least 1 month but less than 6 months meet its duration criterion; the picture would become schizophrenia if symptoms persisted beyond 6 months.
- A 45-year-old woman has had a fixed, nonbizarre belief for over a year that her coworker is secretly in love with her, despite no evidence, but she functions normally at work and has no hallucinations, disorganized speech, or other psychotic symptoms. Which diagnosis best fits?
- Schizophrenia
- Schizoaffective disorder
- Brief psychotic disorder
- Delusional disorder
Correct answer: Delusional disorder
The diagnosis is delusional disorder. It features one or more nonbizarre delusions lasting at least 1 month without other prominent psychotic symptoms and with relatively preserved functioning apart from the delusion's direct impact, distinguishing it from schizophrenia.
- A 27-year-old man meets criteria for schizophrenia but also has periods of major mood episodes; importantly, he has experienced delusions and hallucinations for at least 2 weeks in the absence of any prominent mood symptoms, and mood episodes are present for a majority of the illness. Which diagnosis best fits?
- Schizoaffective disorder
- Schizophrenia
- Bipolar I disorder with psychotic features
- Major depressive disorder with psychotic features
Correct answer: Schizoaffective disorder
The diagnosis is schizoaffective disorder. It requires a major mood episode concurrent with psychotic symptoms, plus at least 2 weeks of psychosis without prominent mood symptoms, with mood episodes present for the majority of the illness, distinguishing it from a mood disorder with psychotic features.
- A 22-year-old woman started on a first-generation antipsychotic for schizophrenia develops galactorrhea, amenorrhea, and breast tenderness. Which medication-related mechanism explains these findings?
- Suppressed cortisol from adrenal blockade
- Elevated prolactin due to dopamine D2 blockade in the tuberoinfundibular pathway
- Increased thyroid hormone secretion
- Direct stimulation of ovarian estrogen production
Correct answer: Elevated prolactin due to dopamine D2 blockade in the tuberoinfundibular pathway
These findings reflect elevated prolactin due to dopamine D2 blockade in the tuberoinfundibular pathway. Dopamine normally inhibits prolactin release, so antipsychotic blockade raises prolactin, causing galactorrhea, menstrual disturbances, and breast symptoms.
- A patient on clozapine for treatment-resistant schizophrenia presents with fever and sore throat. Which life-threatening adverse effect must be urgently excluded with a complete blood count and absolute neutrophil count?
- Aplastic anemia from iron overload
- Hemolytic anemia
- Agranulocytosis
- Polycythemia
Correct answer: Agranulocytosis
Agranulocytosis must be urgently excluded. Clozapine can cause severe neutropenia, so any sign of infection such as fever and sore throat prompts an immediate absolute neutrophil count, and ongoing scheduled hematologic monitoring is mandatory during treatment.
- A patient with treatment-resistant schizophrenia on clozapine develops new tachycardia, fever, chest discomfort, and a rising troponin within the first weeks of therapy. Which serious clozapine-associated cardiac adverse effect should be considered?
- Aortic dissection
- Pericardial tamponade from trauma
- Coronary vasospasm from cocaine
- Myocarditis
Correct answer: Myocarditis
Myocarditis should be considered. Clozapine can cause myocarditis, classically early in treatment, presenting with tachycardia, fever, chest symptoms, and elevated cardiac markers, which warrants prompt evaluation and discontinuation if confirmed.
- A 24-year-old man with first-episode schizophrenia is starting a second-generation antipsychotic. Before and during treatment, which set of parameters should be monitored to detect this drug class's characteristic metabolic adverse effects?
- Weight or body mass index, fasting glucose, and lipid profile
- Serum amylase and lipase
- Coagulation studies and platelet count
- Serum ammonia and lactate
Correct answer: Weight or body mass index, fasting glucose, and lipid profile
Weight or body mass index, fasting glucose, and lipid profile should be monitored. Second-generation antipsychotics commonly cause weight gain, hyperglycemia, and dyslipidemia, so these metabolic parameters are tracked at baseline and at intervals during treatment.
- A 30-year-old woman has recurrent panic attacks and now avoids buses, crowded stores, and standing in line because she fears having an attack and being unable to escape or get help. Which comorbid condition does this avoidance pattern most likely represent?
- Specific phobia
- Agoraphobia
- Obsessive-compulsive disorder
- Social anxiety disorder
Correct answer: Agoraphobia
This avoidance pattern most likely represents agoraphobia. It involves fear or avoidance of situations such as public transportation, open or enclosed spaces, crowds, or being outside the home alone, driven by concern that escape or help would be difficult, and it commonly accompanies panic disorder.
- A 19-year-old college student has intense fear of embarrassment and scrutiny in social and performance situations such as speaking in class, leading to avoidance and distress for over 6 months. For ongoing treatment of this generalized social anxiety disorder, which approach is first-line?
- As-needed benzodiazepines as the sole long-term treatment
- An antipsychotic
- A selective serotonin reuptake inhibitor and cognitive behavioral therapy
- A stimulant
Correct answer: A selective serotonin reuptake inhibitor and cognitive behavioral therapy
First-line treatment is a selective serotonin reuptake inhibitor and cognitive behavioral therapy. SSRIs and SNRIs combined with exposure-based cognitive behavioral therapy are the mainstays for generalized social anxiety disorder; beta-blockers help only with isolated performance situations.
- A 35-year-old man reports intrusive, unwanted thoughts about contamination that cause marked anxiety, which he relieves through repetitive handwashing rituals consuming hours each day. Which diagnosis and first-line treatment are most appropriate?
- Generalized anxiety disorder treated with a beta-blocker
- Panic disorder treated with a benzodiazepine alone
- Specific phobia treated with an antipsychotic
- Obsessive-compulsive disorder treated with an SSRI and exposure and response prevention
Correct answer: Obsessive-compulsive disorder treated with an SSRI and exposure and response prevention
This is obsessive-compulsive disorder, treated with an SSRI and exposure and response prevention. The combination of intrusive obsessions and time-consuming compulsions responds best to higher-dose SSRIs paired with the exposure and response prevention form of cognitive behavioral therapy.
- A 28-year-old combat veteran has, for several months, intrusive memories and nightmares of an explosion, avoidance of reminders, hypervigilance, and an exaggerated startle response, with significant impairment. Which diagnosis and recommended first-line treatment apply?
- Post-traumatic stress disorder treated with trauma-focused psychotherapy and an SSRI or SNRI
- Adjustment disorder treated with a benzodiazepine
- Generalized anxiety disorder treated with an antipsychotic
- Panic disorder treated with a beta-blocker
Correct answer: Post-traumatic stress disorder treated with trauma-focused psychotherapy and an SSRI or SNRI
This is post-traumatic stress disorder, treated with trauma-focused psychotherapy and an SSRI or SNRI. Symptoms of intrusion, avoidance, negative alterations in cognition and mood, and hyperarousal lasting more than a month after trauma respond best to trauma-focused therapy, with SSRIs and SNRIs as first-line medications.
- A 40-year-old woman with generalized anxiety disorder wants a non-benzodiazepine medication that specifically targets chronic anxiety without dependence risk and is not effective for acute attacks. Which agent is a serotonin 5-HT1A partial agonist used for this purpose?
- Alprazolam
- Buspirone
- Propranolol
- Zolpidem
Correct answer: Buspirone
Buspirone is the appropriate agent. As a serotonin 5-HT1A partial agonist it treats chronic generalized anxiety without the dependence risk of benzodiazepines, but it has a delayed onset and is not useful for acute panic attacks.
- A 6-year-old child develops behavioral changes and fluctuating confusion in the hospital after surgery. Which statement about delirium in children is most accurate?
- Delirium does not occur in children
- Delirium in children is always permanent
- Pediatric delirium can occur, may present with irritability or inconsolability, and is often underrecognized
- Children with delirium never have inattention
Correct answer: Pediatric delirium can occur, may present with irritability or inconsolability, and is often underrecognized
Pediatric delirium can occur, may present with irritability or inconsolability, and is often underrecognized. Children, especially in the intensive care setting, develop delirium with the same core features of acute fluctuating inattention, though the behavioral presentation can differ from adults.
- A 50-year-old man with cirrhosis develops fluctuating confusion, asterixis, and altered sleep with a clouded sensorium. His ammonia is elevated. Although this resembles delirium, which underlying process is the specific cause to treat here?
- Alzheimer dementia
- Primary psychiatric psychosis
- Normal aging
- Hepatic encephalopathy
Correct answer: Hepatic encephalopathy
The specific cause is hepatic encephalopathy. In a patient with liver disease, fluctuating confusion with asterixis and elevated ammonia reflects hepatic encephalopathy, a metabolic precipitant of an encephalopathic state that is treated with measures such as lactulose to lower ammonia.
- A 32-year-old woman started on an SSRI 10 days ago calls reporting nausea, mild headache, and increased jitteriness that she finds bothersome but tolerable. She is sleeping and eating normally and denies suicidal thoughts. What is the most appropriate advice?
- Reassure her that these early side effects are common and often diminish over the first 1 to 2 weeks while continuing the medication
- Stop the medication immediately and switch classes
- Double the dose to overcome the side effects
- Add a benzodiazepine indefinitely
Correct answer: Reassure her that these early side effects are common and often diminish over the first 1 to 2 weeks while continuing the medication
The most appropriate advice is reassurance that these early side effects are common and often diminish over the first 1 to 2 weeks while continuing the medication. Transient nausea, headache, and jitteriness frequently accompany SSRI initiation and usually resolve, so premature discontinuation is avoided when symptoms are tolerable.
- A 70-year-old man with severe psychotic depression has not responded to combined antidepressant and antipsychotic therapy and is refusing food. Electroconvulsive therapy is planned. Which is a recognized common adverse effect of electroconvulsive therapy that should be discussed in consent?
- Permanent loss of all long-term memories
- Transient memory impairment, particularly around the treatment period
- Irreversible motor paralysis
- Chronic seizure disorder
Correct answer: Transient memory impairment, particularly around the treatment period
A recognized common adverse effect is transient memory impairment, particularly around the treatment period. Electroconvulsive therapy can cause short-term confusion and retrograde and anterograde memory disturbance that typically improve after the course, and this should be discussed during consent.
- A 55-year-old man on an antidepressant for depression is brought in with marked autonomic instability and neuromuscular hyperactivity after an antiemetic was added for nausea. Which antiemetic is a recognized serotonergic agent that can contribute to serotonin syndrome when combined with an antidepressant?
- Loperamide
- Famotidine
- Ondansetron
- Calcium carbonate
Correct answer: Ondansetron
Ondansetron is a recognized serotonergic agent that can contribute to serotonin syndrome. As a serotonin 5-HT3 antagonist with serotonergic activity, it can add to overall serotonergic load when combined with an antidepressant, helping precipitate the syndrome.
- A 26-year-old man with schizophrenia stops his antipsychotic and relapses with severe disorganization and refusal to eat. On exam he is mute, maintains postures imposed by the examiner, and shows waxy flexibility. Which feature does this describe, and what is an appropriate initial treatment?
- Tardive dyskinesia, treated by lowering the antipsychotic
- Akathisia, treated with a beta-blocker
- Acute dystonia, treated with an anticholinergic
- Catatonia, treated initially with a benzodiazepine such as lorazepam
Correct answer: Catatonia, treated initially with a benzodiazepine such as lorazepam
This describes catatonia, treated initially with a benzodiazepine such as lorazepam. Features like mutism, posturing, and waxy flexibility characterize catatonia, which often responds to a lorazepam challenge, with electroconvulsive therapy reserved for refractory or life-threatening cases.
- A 34-year-old woman with bipolar I disorder is in the maintenance phase after recovering from a manic episode. Which goal best describes the purpose of maintenance pharmacotherapy in bipolar disorder?
- To prevent recurrence of mood episodes and stabilize mood long-term
- To cure the disorder so medication can soon be stopped
- To treat only acute mania as it arises
- To sedate the patient continuously
Correct answer: To prevent recurrence of mood episodes and stabilize mood long-term
The purpose of maintenance pharmacotherapy is to prevent recurrence of mood episodes and stabilize mood long-term. Because bipolar disorder is chronic and recurrent, ongoing mood stabilizer therapy reduces the frequency and severity of future manic and depressive episodes.
- A 48-year-old man on chronic lithium is scheduled for monitoring. To obtain a meaningful trough lithium level that guides dosing, when should the blood sample be drawn relative to the last dose?
- Immediately after the morning dose
- Approximately 12 hours after the last dose
- At a random time of day
- Only during an acute toxic episode
Correct answer: Approximately 12 hours after the last dose
A meaningful trough lithium level is drawn approximately 12 hours after the last dose. Standardizing to a 12-hour trough allows consistent interpretation against the therapeutic range and reliable dose adjustment, whereas peak or random levels are misleading.
- A 21-year-old man with new-onset psychosis is started on risperidone. The team plans an adequate trial before judging response. Approximately how long should an antipsychotic generally be continued at a therapeutic dose to assess efficacy for psychotic symptoms?
- About 24 hours
- About 6 months minimum before any assessment
- Several weeks
- Only a few hours
Correct answer: Several weeks
An antipsychotic should generally be continued at a therapeutic dose for several weeks to assess efficacy. Antipsychotic response, especially for positive symptoms, develops over weeks, so an adequate trial is needed before declaring a medication ineffective and switching.
- A 60-year-old hospitalized woman with delirium is calm but inattentive and somnolent during the day. The team debates pharmacologic treatment. Which approach to medication for hypoactive delirium without agitation is most appropriate?
- Routinely sedate with scheduled antipsychotics
- Give benzodiazepines to improve attention
- Administer anticholinergics to increase alertness
- Avoid antipsychotics and focus on treating the underlying cause and supportive care
Correct answer: Avoid antipsychotics and focus on treating the underlying cause and supportive care
The most appropriate approach is to avoid antipsychotics and focus on treating the underlying cause and supportive care. Antipsychotics are reserved for dangerous agitation; in hypoactive delirium without agitation they offer no benefit and may add risk, so correcting precipitants and nonpharmacologic support are emphasized.
- A 29-year-old man with a first manic episode of bipolar I disorder is started on a mood stabilizer. He drinks alcohol heavily and has unreliable follow-up. Considering safety and monitoring in this patient, which point about lithium versus valproate is most relevant to the choice?
- Lithium requires regular serum level and renal and thyroid monitoring, which assumes reliable follow-up
- Valproate requires no laboratory monitoring at all
- Neither agent has any monitoring requirements
- Lithium is safe to combine freely with heavy alcohol use
Correct answer: Lithium requires regular serum level and renal and thyroid monitoring, which assumes reliable follow-up
The most relevant point is that lithium requires regular serum level and renal and thyroid monitoring, which assumes reliable follow-up. In a patient with adherence and follow-up concerns plus heavy alcohol use, the intensive monitoring and narrow therapeutic window of lithium are important considerations in agent selection.
- A 33-year-old woman taking an antidepressant is started on the migraine medication sumatriptan and her clinician weighs serotonergic interaction risk. Which statement best reflects current understanding of combining a triptan with an SSRI or SNRI?
- The combination is invariably fatal and absolutely contraindicated
- Serotonin syndrome is a theoretical and uncommon risk, so patients should be counseled to recognize symptoms while the combination is often used with caution
- Triptans have no serotonergic activity whatsoever
- The combination eliminates any antidepressant effect
Correct answer: Serotonin syndrome is a theoretical and uncommon risk, so patients should be counseled to recognize symptoms while the combination is often used with caution
Serotonin syndrome is a theoretical and uncommon risk with this combination, so patients should be counseled to recognize symptoms while the combination is often used with caution. Triptans have serotonergic activity, but clinically significant serotonin syndrome from triptan plus SSRI or SNRI is rare, and the agents are frequently co-prescribed with appropriate counseling.
- A 25-year-old man brought in agitated and psychotic is given intramuscular haloperidol and within an hour develops his eyes forced upward and to one side that he cannot voluntarily correct. Which name describes this specific acute dystonic presentation?
- Nystagmus
- Internuclear ophthalmoplegia
- Oculogyric crisis
- Horner syndrome
Correct answer: Oculogyric crisis
This specific presentation is an oculogyric crisis. It is a form of acute dystonia from high-potency antipsychotics in which sustained involuntary upward and lateral deviation of the eyes occurs, and it responds rapidly to an anticholinergic such as benztropine or diphenhydramine.
- A 38-year-old woman in alcohol withdrawal being treated with benzodiazepines is found unresponsive with shallow breathing after escalating doses. Which complication of benzodiazepine therapy should be suspected, and what is the appropriate immediate response?
- Serotonin syndrome, managed with cyproheptadine
- Neuroleptic malignant syndrome, managed with dantrolene
- Lithium toxicity, managed with dialysis
- Oversedation with respiratory depression, managed with supportive airway and ventilatory support
Correct answer: Oversedation with respiratory depression, managed with supportive airway and ventilatory support
Oversedation with respiratory depression should be suspected and managed with supportive airway and ventilatory support. Cumulative benzodiazepine dosing can cause excessive sedation and hypoventilation; in alcohol withdrawal, flumazenil is generally avoided because it can precipitate seizures, so supportive care is the mainstay.
- A 36-year-old man with schizophrenia has prominent positive symptoms well controlled on risperidone but remains troubled by persistent negative symptoms and cognitive difficulty. Which statement best characterizes the prognosis-relevant feature being described?
- Negative and cognitive symptoms are often the major drivers of long-term functional impairment and respond less to antipsychotics
- Negative symptoms always resolve fully with any antipsychotic
- Cognitive symptoms are not part of schizophrenia
- Positive symptoms are the only determinant of functioning
Correct answer: Negative and cognitive symptoms are often the major drivers of long-term functional impairment and respond less to antipsychotics
Negative and cognitive symptoms are often the major drivers of long-term functional impairment and respond less to antipsychotics. While positive symptoms typically improve with treatment, the persistent negative and cognitive deficits substantially limit social and occupational functioning and are harder to treat.
- A 45-year-old woman with bipolar disorder is being switched from valproate to carbamazepine. Which adverse effect of carbamazepine requires baseline and periodic complete blood count monitoring?
- Pancreatitis
- Agranulocytosis and aplastic anemia
- Nephrogenic diabetes insipidus
- Hypothyroidism
Correct answer: Agranulocytosis and aplastic anemia
Carbamazepine can cause agranulocytosis and aplastic anemia, which requires baseline and periodic complete blood count monitoring. It is also a strong hepatic enzyme inducer and can cause hyponatremia and serious skin reactions, but the hematologic toxicity is the basis for blood count surveillance.
- A 19-year-old woman develops delusions and hallucinations for 10 days after the sudden death of a parent, then returns fully to baseline. The clinician documents the specifier indicating a precipitating stressor. Which condition with which specifier does this represent?
- Schizophreniform disorder, provisional
- Delusional disorder, persecutory type
- Brief psychotic disorder with marked stressor
- Schizoaffective disorder, bipolar type
Correct answer: Brief psychotic disorder with marked stressor
This represents brief psychotic disorder with marked stressor. Psychotic symptoms lasting at least 1 day but less than 1 month with full return to baseline, occurring in response to an identifiable stressor such as bereavement, fit this diagnosis and specifier.
- A 50-year-old man with major depressive disorder reports that he has tried an SSRI and an SNRI without benefit and now has psychotic features along with severe depression. Which treatment combination is appropriate for major depression with psychotic features?
- An SSRI alone
- A benzodiazepine alone
- A mood stabilizer alone
- An antidepressant combined with an antipsychotic, or electroconvulsive therapy
Correct answer: An antidepressant combined with an antipsychotic, or electroconvulsive therapy
Appropriate treatment is an antidepressant combined with an antipsychotic, or electroconvulsive therapy. Psychotic depression responds poorly to antidepressant monotherapy and requires the addition of an antipsychotic or, for severe or refractory cases, electroconvulsive therapy.
- A 31-year-old woman taking an SSRI is admitted with serotonin syndrome and is being differentiated from anticholinergic toxicity. Which finding favors serotonin syndrome over anticholinergic toxicity?
- Diaphoresis with hyperactive bowel sounds and clonus
- Dry skin and absent bowel sounds
- Flushed dry skin with urinary retention
- Mydriasis with quiet abdomen and no clonus
Correct answer: Diaphoresis with hyperactive bowel sounds and clonus
Diaphoresis with hyperactive bowel sounds and clonus favors serotonin syndrome. Serotonin syndrome produces moist skin, increased bowel activity, and neuromuscular hyperexcitability with clonus, whereas anticholinergic toxicity causes dry flushed skin, decreased bowel sounds, and urinary retention without clonus.
- An 82-year-old man with delirium is being treated for the underlying cause. His family asks why benzodiazepines are generally avoided for his agitation. Which explanation is most accurate?
- Benzodiazepines have no effect on the brain
- Benzodiazepines can worsen confusion and prolong delirium except in alcohol or sedative withdrawal
- Benzodiazepines are the preferred first-line agent for all delirium
- Benzodiazepines cure the underlying cause of delirium
Correct answer: Benzodiazepines can worsen confusion and prolong delirium except in alcohol or sedative withdrawal
Benzodiazepines can worsen confusion and prolong delirium except in alcohol or sedative withdrawal. Their sedating and disinhibiting effects often aggravate non-withdrawal delirium, so they are reserved for withdrawal states while low-dose antipsychotics are used cautiously for dangerous agitation.
- A 27-year-old man with bipolar I disorder presents with a mixed presentation of simultaneous manic and depressive features, including racing thoughts, agitation, and pervasive hopelessness with suicidal ideation. Why does this mixed presentation warrant heightened concern?
- Mixed features indicate the illness has resolved
- Mixed features mean antidepressant monotherapy is safe
- Mixed features carry an elevated suicide risk and require close monitoring and prompt mood stabilization
- Mixed features never include suicidal ideation
Correct answer: Mixed features carry an elevated suicide risk and require close monitoring and prompt mood stabilization
Mixed features carry an elevated suicide risk and require close monitoring and prompt mood stabilization. The combination of high energy and agitation with depressive hopelessness increases the danger of acting on suicidal thoughts, and antidepressants are avoided because they can worsen the mixed manic component.
- A 23-year-old woman with panic disorder asks whether stimulants such as caffeine affect her condition. Which advice is most appropriate regarding lifestyle factors in panic disorder?
- Encourage heavy caffeine intake to improve alertness
- State that caffeine has no relationship to anxiety
- Advise that alcohol is a recommended long-term anxiety treatment
- Recommend reducing caffeine and other stimulants because they can trigger or worsen panic attacks
Correct answer: Recommend reducing caffeine and other stimulants because they can trigger or worsen panic attacks
The appropriate advice is to recommend reducing caffeine and other stimulants because they can trigger or worsen panic attacks. Stimulants increase sympathetic arousal that can precipitate panic, so limiting caffeine is a reasonable adjunct to evidence-based pharmacologic and psychotherapeutic treatment.
- A 19-year-old college athlete reports one day of periumbilical pain that has now settled into the right lower quadrant, along with loss of appetite and one episode of vomiting. He has rebound tenderness at a point two-thirds of the way from the umbilicus to the anterior superior iliac spine. Which physical exam landmark is being described?
- McBurney point
- Murphy point
- Charcot point
- Rovsing point
Correct answer: McBurney point
McBurney point is the landmark described. It lies roughly two-thirds of the distance from the umbilicus to the anterior superior iliac spine and marks maximal tenderness in acute appendicitis. Murphy sign relates to gallbladder inflammation, and Rovsing sign refers to right-lower-quadrant pain elicited by palpating the left side rather than a fixed point.
- A 28-year-old woman with suspected appendicitis is found on examination to develop pain in the right lower quadrant when the examiner palpates and releases the left lower quadrant. What is the name of this elicited sign?
- Psoas sign
- Rovsing sign
- Obturator sign
- Cullen sign
Correct answer: Rovsing sign
Rovsing sign is the finding described, in which palpation of the left lower quadrant produces referred pain in the right lower quadrant, supporting peritoneal irritation from appendicitis. The psoas and obturator signs involve hip movement, and Cullen sign is periumbilical bruising seen in retroperitoneal hemorrhage.
- A 33-year-old pregnant woman in the second trimester presents with right-sided abdominal pain and leukocytosis. The clinical picture is concerning for appendicitis, and imaging is needed because the diagnosis is uncertain. Which imaging study is the preferred first choice to avoid fetal radiation?
- Abdominal CT with contrast
- Plain abdominal radiograph series
- Graded-compression ultrasound
- Barium follow-through
Correct answer: Graded-compression ultrasound
Graded-compression ultrasound is the preferred first imaging choice in pregnancy because it avoids ionizing radiation while still allowing assessment for appendicitis. CT and plain films expose the fetus to radiation, and a barium study is neither sensitive nor appropriate for this acute concern; MRI is the usual next step if ultrasound is inconclusive.
- A 40-year-old man undergoes appendectomy, and pathology of the removed appendix reveals a 1.2 cm carcinoid (neuroendocrine) tumor confined to the tip with clear margins. Given the size and location, what is the most appropriate management?
- Immediate right hemicolectomy
- Total colectomy
- Adjuvant whole-abdomen radiation
- No further surgery is required
Correct answer: No further surgery is required
No further surgery is required is correct. A small appendiceal neuroendocrine tumor under 2 cm confined to the tip with negative margins is adequately treated by appendectomy alone. Right hemicolectomy is reserved for larger tumors, base involvement, or other high-risk features, and total colectomy and abdominal radiation are not indicated.
- A 22-year-old man with right lower quadrant pain has a CT scan showing an inflamed, fluid-filled appendiceal mass with a surrounding walled-off abscess, and he has had symptoms for six days. He is hemodynamically stable without diffuse peritonitis. What is the most appropriate initial management?
- Intravenous antibiotics and percutaneous drainage
- Immediate open appendectomy
- Discharge with oral antibiotics only
- Emergent total colectomy
Correct answer: Intravenous antibiotics and percutaneous drainage
Intravenous antibiotics and percutaneous drainage is most appropriate. A walled-off appendiceal abscess in a stable patient is best managed nonoperatively first, because immediate surgery into a phlegmon increases complications. Interval appendectomy may be considered later. Oral antibiotics alone are insufficient for a drainable abscess, and colectomy is not indicated.
- A 16-year-old boy with classic appendicitis is taken for laparoscopic appendectomy, but at operation the appendix appears completely normal. The terminal ileum, however, is thickened and inflamed. What is the most appropriate next step?
- Close without removing the appendix or examining further
- Remove the normal appendix and inspect the terminal ileum
- Perform an immediate ileocecal resection
- Convert to total abdominal colectomy
Correct answer: Remove the normal appendix and inspect the terminal ileum
Removing the normal appendix and inspecting the terminal ileum is most appropriate. When the appendix is normal at operation, it is typically still removed so future right-lower-quadrant pain is not misattributed, and the bowel is examined for alternative causes such as terminal ileitis. Immediate resection or colectomy would be excessive for an inflammatory finding requiring further evaluation.
- A 25-year-old healthy man has CT-confirmed acute uncomplicated appendicitis without perforation or abscess. He asks about treatment options. Which statement most accurately reflects current evidence on antibiotic-only therapy compared with appendectomy?
- Antibiotics cure all cases permanently with no recurrence
- Antibiotics are contraindicated in uncomplicated appendicitis
- Antibiotics may avoid surgery initially but carry a meaningful recurrence rate
- Antibiotics are only used when surgery has already failed
Correct answer: Antibiotics may avoid surgery initially but carry a meaningful recurrence rate
The accurate statement is that antibiotics may avoid surgery initially but carry a meaningful recurrence rate. In selected patients with uncomplicated appendicitis, antibiotic-first therapy can succeed, yet a substantial fraction later require appendectomy. Antibiotics are neither contraindicated nor reserved only for surgical failure, and they do not guarantee permanent cure.
- A 58-year-old woman who had a hysterectomy years ago presents with crampy abdominal pain, distention, bilious vomiting, and inability to pass stool or gas. Abdominal radiograph shows dilated loops of small bowel with air-fluid levels and no colonic gas. What is the most likely underlying cause of her obstruction?
- Sigmoid volvulus
- Colon carcinoma
- Acute pancreatitis
- Postoperative adhesions
Correct answer: Postoperative adhesions
Postoperative adhesions are the most likely cause. In adults with prior abdominal or pelvic surgery, adhesions are by far the leading etiology of small bowel obstruction. The dilated small bowel loops with air-fluid levels and absent colonic gas fit a complete small bowel obstruction; volvulus and colon cancer typically cause large bowel patterns, and pancreatitis does not produce this picture.
- A 62-year-old man with an adhesive small bowel obstruction is hemodynamically stable, has no peritoneal signs, and his CT shows no closed-loop or ischemic features. What is the most appropriate initial management?
- Bowel rest, nasogastric decompression, and IV fluids
- Immediate exploratory laparotomy
- Oral feeding to stimulate transit
- High-dose corticosteroids
Correct answer: Bowel rest, nasogastric decompression, and IV fluids
Bowel rest, nasogastric decompression, and IV fluids is most appropriate. A stable partial or simple adhesive obstruction without ischemia or peritonitis is initially managed nonoperatively, as many resolve. Immediate surgery is reserved for failure of conservative therapy or signs of strangulation; oral feeding and steroids are not part of acute management.
- A 55-year-old man being treated nonoperatively for a small bowel obstruction develops a rising heart rate, fever, increasing localized abdominal tenderness with guarding, and a worsening lactate. What do these findings most strongly suggest?
- Successful resolution of the obstruction
- Bowel ischemia or strangulation requiring surgery
- A simple ileus needing only more time
- Dehydration correctable with oral fluids
Correct answer: Bowel ischemia or strangulation requiring surgery
Bowel ischemia or strangulation requiring surgery is the correct interpretation. Fever, tachycardia, peritoneal signs, and rising lactate during a small bowel obstruction signal compromised bowel viability and mandate operative exploration. These are not features of resolution, simple ileus, or isolated dehydration.
- A 70-year-old man with no prior abdominal surgery presents with a small bowel obstruction. He has a tender bulge in the groin below the inguinal ligament that cannot be reduced. What is the most likely mechanism of his obstruction?
- Adhesive disease
- Crohn stricture
- Incarcerated femoral hernia
- Gallstone ileus
Correct answer: Incarcerated femoral hernia
An incarcerated femoral hernia is the most likely mechanism. In a patient with no prior surgery, hernia is a leading cause of obstruction, and a nonreducible tender mass below the inguinal ligament localizes to the femoral canal. Adhesions are unlikely without prior surgery, and Crohn stricture or gallstone ileus would not present as a groin bulge.
- A 65-year-old woman has CT findings of a small bowel obstruction with a U-shaped, fluid-filled dilated loop, a beak-like transition, and reduced bowel-wall enhancement. These features describe which high-risk pattern that warrants urgent surgery?
- Simple partial obstruction
- Paralytic ileus
- Functional pseudo-obstruction
- Closed-loop obstruction
Correct answer: Closed-loop obstruction
Closed-loop obstruction is the pattern described. A U- or C-shaped dilated loop with a beak sign and diminished wall enhancement indicates a segment obstructed at two points, which carries a high risk of strangulation and demands urgent operation. This contrasts with simple partial obstruction or ileus, which are managed nonoperatively at first.
- An 80-year-old woman with no surgical history presents with a small bowel obstruction. CT shows pneumobilia, a dilated small bowel, and an ectopic gallstone lodged in the distal ileum. What is the underlying diagnosis?
- Gallstone ileus
- Adhesive obstruction
- Intussusception from a lipoma
- Sigmoid volvulus
Correct answer: Gallstone ileus
Gallstone ileus is the diagnosis. The triad of pneumobilia, small bowel obstruction, and an ectopic gallstone (Rigler triad) results from a gallstone eroding through a cholecystoenteric fistula and impacting in the distal ileum. This mechanical obstruction is distinct from adhesions, intussusception, or volvulus.
- A 60-year-old man with a partial small bowel obstruction has been managed conservatively for 48 hours. A water-soluble contrast agent is given and a follow-up radiograph shows contrast reaching the colon. What does this result most likely predict?
- Imminent perforation
- Successful nonoperative resolution
- Need for emergent laparotomy
- Development of a closed loop
Correct answer: Successful nonoperative resolution
Successful nonoperative resolution is the correct prediction. When water-soluble contrast reaches the colon within about 24 hours in adhesive partial obstruction, it strongly predicts resolution without surgery and can itself be therapeutic. Failure of contrast to progress would instead suggest the need for operative management.
- A 50-year-old woman recovering from abdominal surgery has abdominal distention, absent bowel sounds, no flatus, but minimal pain and no clear transition point on imaging; electrolytes show hypokalemia. What is the most likely diagnosis and best management?
- Mechanical obstruction requiring immediate surgery
- Closed-loop obstruction requiring resection
- Postoperative ileus treated by correcting electrolytes and supportive care
- Mesenteric ischemia requiring angiography
Correct answer: Postoperative ileus treated by correcting electrolytes and supportive care
Postoperative ileus treated by correcting electrolytes and supportive care is correct. Diffuse distention without a transition point, minimal pain, and contributing hypokalemia after surgery point to a functional ileus rather than mechanical obstruction. Management is supportive with bowel rest and electrolyte correction, not surgery or angiography.
- A 45-year-old obese woman presents with constant right upper quadrant pain after a fatty meal, fever, and a positive inspiratory arrest with deep palpation under the right costal margin. What is the name of this sign?
- Courvoisier sign
- Grey Turner sign
- Kehr sign
- Murphy sign
Correct answer: Murphy sign
Murphy sign is the finding described, in which deep palpation under the right costal margin during inspiration causes the patient to arrest the breath because of pain from an inflamed gallbladder. Courvoisier refers to a palpable nontender gallbladder, Grey Turner to flank bruising, and Kehr to referred shoulder pain.
- A 50-year-old woman with suspected acute cholecystitis undergoes right upper quadrant ultrasound. Which combination of findings best supports the diagnosis?
- Gallstones, wall thickening, and pericholecystic fluid
- A dilated common bile duct only
- Hepatic steatosis with normal gallbladder
- Splenomegaly with ascites
Correct answer: Gallstones, wall thickening, and pericholecystic fluid
Gallstones, gallbladder wall thickening, and pericholecystic fluid together best support acute cholecystitis, often accompanied by a sonographic Murphy sign. An isolated dilated common bile duct points more toward choledocholithiasis, while steatosis or splenomegaly with ascites reflect unrelated processes.
- A 48-year-old woman has clinically suspected acute cholecystitis, but her ultrasound is equivocal. Which imaging study is most specific for confirming cystic duct obstruction?
- Plain abdominal radiograph
- Hepatobiliary iminodiacetic acid (HIDA) scan
- Barium swallow
- Renal ultrasound
Correct answer: Hepatobiliary iminodiacetic acid (HIDA) scan
A hepatobiliary iminodiacetic acid (HIDA) scan is most specific. Nonvisualization of the gallbladder due to cystic duct obstruction confirms acute cholecystitis when ultrasound is inconclusive. Plain films, barium studies, and renal ultrasound do not assess gallbladder filling.
- A 52-year-old man is diagnosed with acute calculous cholecystitis and is a reasonable operative candidate. According to current practice, what is the preferred definitive treatment and timing?
- Cholecystectomy delayed by at least three months
- Lifelong antibiotics without surgery
- Early laparoscopic cholecystectomy during the same admission
- Routine open cholecystectomy for all patients
Correct answer: Early laparoscopic cholecystectomy during the same admission
Early laparoscopic cholecystectomy during the same admission is preferred. Operating within the first days of presentation reduces complications and recurrent episodes compared with delayed surgery. Antibiotics are adjuncts, not definitive therapy, and open surgery is reserved for conversion or specific contraindications to laparoscopy.
- A 75-year-old man with acute cholecystitis and severe sepsis is judged too unstable to tolerate surgery. What is the most appropriate temporizing intervention?
- Immediate open cholecystectomy regardless of stability
- Endoscopic sphincterotomy
- Observation with oral antibiotics at home
- Percutaneous cholecystostomy tube drainage
Correct answer: Percutaneous cholecystostomy tube drainage
Percutaneous cholecystostomy tube drainage is most appropriate. In a critically ill patient who cannot tolerate an operation, draining the gallbladder percutaneously controls the infection and allows definitive cholecystectomy after stabilization. Forcing surgery is dangerous, sphincterotomy treats ductal stones, and outpatient observation is unsafe in severe sepsis.
- A 68-year-old diabetic woman with acute cholecystitis has imaging showing gas within the gallbladder wall and lumen, and she appears toxic. What complication does this represent, and what does it require?
- Emphysematous cholecystitis requiring urgent cholecystectomy
- Simple biliary colic requiring only analgesia
- Chronic cholecystitis requiring elective follow-up
- Gallbladder polyp requiring surveillance
Correct answer: Emphysematous cholecystitis requiring urgent cholecystectomy
Emphysematous cholecystitis requiring urgent cholecystectomy is the answer. Gas in the gallbladder wall and lumen, typically in diabetics, indicates gas-forming infection with high risk of gangrene and perforation, so prompt surgery (and antibiotics) is required. This is far more serious than biliary colic, chronic cholecystitis, or a polyp.
- A 60-year-old woman develops a fever on the first postoperative night after abdominal surgery. She is breathing shallowly because of incisional pain, and her lung bases have decreased breath sounds. Which cause of early postoperative fever is most likely?
- Deep wound infection
- Atelectasis
- Urinary tract infection
- Deep vein thrombosis
Correct answer: Atelectasis
Atelectasis is the most likely cause of fever on the first postoperative day, classically the wind in the five Ws mnemonic, from shallow breathing and alveolar collapse. Wound infection and urinary infection typically appear several days later, and venous thrombosis (the walking W) tends to occur later still.
- A 64-year-old man develops fever on postoperative day 3 and has had an indwelling urinary catheter since surgery. Urinalysis shows pyuria and bacteriuria. Which element of the postoperative fever mnemonic does this represent?
- Wind (atelectasis)
- Wound (surgical site infection)
- Water (urinary tract infection)
- Wonder drugs (drug fever)
Correct answer: Water (urinary tract infection)
Water, representing urinary tract infection, is the element described. Catheter-associated urinary infection typically emerges around postoperative day three and presents with pyuria and bacteriuria. Wind refers to early atelectasis, wound to surgical-site infection later in the course, and wonder drugs to drug-related fever.
- A 55-year-old man develops fever on postoperative day 6 with redness, warmth, and purulent drainage from his abdominal incision. Which postoperative fever cause does this represent, and what is the initial step?
- Atelectasis treated by incentive spirometry
- Drug fever treated by stopping antibiotics
- Pulmonary embolism treated by anticoagulation
- Wound infection treated by opening and draining the incision
Correct answer: Wound infection treated by opening and draining the incision
Wound infection treated by opening and draining the incision is correct. Surgical-site infection classically presents around postoperative days five to seven with erythema, warmth, and purulent drainage, and the initial step is to open and drain the wound, with antibiotics for surrounding cellulitis. The timeline and drainage make atelectasis, drug fever, and embolism unlikely.
- A patient is on postoperative day 9 and develops a low-grade fever along with unilateral leg swelling and calf tenderness. Which late cause of postoperative fever does this most likely reflect?
- Venous thromboembolism
- Atelectasis
- Urinary tract infection
- Early wound dehiscence
Correct answer: Venous thromboembolism
Venous thromboembolism is the most likely late cause. Around the end of the first postoperative week or later, deep vein thrombosis or pulmonary embolism, the walking W, becomes a leading source of fever, and unilateral leg swelling with calf tenderness supports it. Atelectasis and urinary infection occur earlier, and dehiscence does not present this way.
- A trauma patient arrives and the team performs the primary survey. Which sequence correctly reflects the order of assessment and intervention?
- Circulation, Airway, Breathing, Disability, Exposure
- Airway, Breathing, Circulation, Disability, Exposure
- Breathing, Airway, Disability, Circulation, Exposure
- Disability, Exposure, Airway, Breathing, Circulation
Correct answer: Airway, Breathing, Circulation, Disability, Exposure
Airway, Breathing, Circulation, Disability, Exposure is the correct sequence of the primary survey, prioritizing the most immediately life-threatening problems first. Securing the airway precedes breathing and circulation, with neurologic disability and full exposure assessed afterward. The other orders misrank these priorities.
- During the breathing portion of a trauma primary survey, a patient has hypotension, distended neck veins, tracheal deviation away from the affected side, and absent breath sounds on one side. What is the immediate intervention?
- Pericardiocentesis
- Immediate intubation alone
- Needle decompression followed by chest tube
- CT chest before any intervention
Correct answer: Needle decompression followed by chest tube
Needle decompression followed by chest tube is the immediate intervention. Hypotension with distended neck veins, tracheal deviation, and absent unilateral breath sounds indicates a tension pneumothorax, a clinical diagnosis treated without waiting for imaging. Pericardiocentesis addresses tamponade, and CT would dangerously delay decompression.
- While assessing circulation in a hypotensive blunt-trauma patient, the team performs a focused bedside ultrasound that shows free fluid in the abdomen. The patient remains hemodynamically unstable despite resuscitation. What is the most appropriate next step?
- Discharge after observation
- Outpatient CT scan next week
- Diagnostic colonoscopy
- Emergent exploratory laparotomy
Correct answer: Emergent exploratory laparotomy
Emergent exploratory laparotomy is most appropriate. A hemodynamically unstable blunt-trauma patient with free intraperitoneal fluid on focused ultrasound has presumed ongoing hemorrhage and needs operative control of bleeding without delay. Observation, delayed imaging, or colonoscopy would be unsafe in instability.
- During the disability step of the trauma primary survey, the team rapidly assesses neurologic status. Which tool is used to quantify level of consciousness at this point?
- Glasgow Coma Scale
- CHA2DS2-VASc score
- Ranson criteria
- Wells score
Correct answer: Glasgow Coma Scale
The Glasgow Coma Scale is the tool used in the disability step to quantify level of consciousness by scoring eye, verbal, and motor responses. CHA2DS2-VASc estimates stroke risk in atrial fibrillation, Ranson criteria grade pancreatitis severity, and Wells score estimates pretest probability of venous thromboembolism.
- A trauma patient is fully undressed during the exposure step. After completing the survey, what important measure must be taken during this phase to prevent a common complication?
- Leave the patient uncovered to monitor skin
- Keep the patient warm to prevent hypothermia
- Withhold all IV fluids
- Avoid using warmed blankets
Correct answer: Keep the patient warm to prevent hypothermia
Keeping the patient warm to prevent hypothermia is the key measure. After exposing the patient to inspect for injuries, warmed blankets and fluids are used to avoid hypothermia, which worsens coagulopathy and acidosis in trauma. Leaving the patient uncovered or avoiding warming would promote that lethal complication.
- A 74-year-old man with atrial fibrillation who is not anticoagulated presents with the sudden onset of severe diffuse abdominal pain that is strikingly out of proportion to a relatively benign abdominal exam. What is the most likely diagnosis?
- Acute diverticulitis
- Peptic ulcer disease
- Acute mesenteric ischemia from arterial embolism
- Irritable bowel syndrome
Correct answer: Acute mesenteric ischemia from arterial embolism
Acute mesenteric ischemia from arterial embolism is most likely. Pain markedly out of proportion to exam findings, in a patient with atrial fibrillation not on anticoagulation, points to an embolus to the superior mesenteric artery. Diverticulitis, peptic ulcer disease, and irritable bowel do not produce this hallmark pain-exam mismatch.
- A 70-year-old woman presents with suspected acute mesenteric ischemia. Which imaging study is the diagnostic test of choice to confirm vascular occlusion?
- Upper GI barium series
- Abdominal MRI without contrast
- Standing abdominal radiograph
- CT angiography of the abdomen
Correct answer: CT angiography of the abdomen
CT angiography of the abdomen is the test of choice, rapidly demonstrating arterial or venous occlusion and bowel changes in suspected mesenteric ischemia. A barium study, noncontrast MRI, and plain radiograph lack the sensitivity to define the vascular lesion that drives management.
- A 78-year-old patient in the intensive care unit on high-dose vasopressors for septic shock develops worsening abdominal pain and lactic acidosis. Imaging suggests bowel hypoperfusion without a discrete clot. What type of mesenteric ischemia is this, and what is a key management step?
- Nonocclusive mesenteric ischemia treated by improving perfusion and reducing vasopressors
- Embolic ischemia treated by immediate embolectomy
- Venous thrombosis treated by lifelong warfarin alone
- Chronic mesenteric ischemia treated electively
Correct answer: Nonocclusive mesenteric ischemia treated by improving perfusion and reducing vasopressors
Nonocclusive mesenteric ischemia treated by improving perfusion and reducing vasopressors is correct. Low-flow states from shock and vasopressors cause splanchnic hypoperfusion without a discrete occlusion, so management centers on restoring perfusion and minimizing vasoconstrictors. Embolectomy addresses a clot that is absent here, and the presentation is acute rather than chronic.
- A 72-year-old man is diagnosed with acute embolic occlusion of the superior mesenteric artery and is taken to the operating room. At laparotomy, a long segment of small bowel is frankly necrotic and nonviable. What is the appropriate operative step for that segment?
- Primary anastomosis without removing dead bowel
- Resection of the nonviable bowel
- Closure with no resection
- Bypass around the bowel without resection
Correct answer: Resection of the nonviable bowel
Resection of the nonviable bowel is appropriate. Frankly necrotic intestine must be removed to prevent sepsis and perforation, often with revascularization of viable bowel and a planned second-look operation. Leaving dead bowel in place, whether by closure or bypass, would be fatal.
- A 65-year-old woman with weight loss reports recurrent dull, crampy abdominal pain that begins about 30 minutes after eating and resolves between meals, leading her to fear food. What is the most likely diagnosis?
- Acute appendicitis
- Sigmoid volvulus
- Chronic mesenteric ischemia
- Acute cholecystitis
Correct answer: Chronic mesenteric ischemia
Chronic mesenteric ischemia is most likely. Postprandial crampy pain (intestinal angina), food fear, and weight loss reflect inadequate mesenteric blood flow that worsens with the increased demand of digestion. The pattern is distinct from the acute, severe pain of appendicitis, volvulus, or cholecystitis.
- A 70-year-old man who has smoked for decades arrives with sudden severe abdominal and back pain, hypotension, and a pulsatile abdominal mass. He is hemodynamically unstable. What is the most appropriate next step?
- Outpatient ultrasound surveillance
- CT angiography before any intervention regardless of stability
- Observation with serial exams
- Immediate surgical repair without delay for imaging
Correct answer: Immediate surgical repair without delay for imaging
Immediate surgical repair without delay for imaging is correct. The triad of hypotension, back or abdominal pain, and a pulsatile mass in a smoker indicates a ruptured abdominal aortic aneurysm, and an unstable patient must go directly for repair rather than awaiting imaging. Surveillance, mandatory imaging, or observation would be fatal here.
- Current guidelines recommend one-time abdominal aortic aneurysm screening with ultrasound for which group?
- Men aged 65 to 75 who have ever smoked
- All women regardless of smoking history
- Everyone over age 40
- Only patients with known heart failure
Correct answer: Men aged 65 to 75 who have ever smoked
Men aged 65 to 75 who have ever smoked is the correct screening group, reflecting their elevated prevalence of abdominal aortic aneurysm. Universal screening of all women, everyone over 40, or only heart-failure patients does not match the evidence-based, risk-targeted recommendation.
- A 72-year-old asymptomatic man is found to have a 4.2 cm infrarenal abdominal aortic aneurysm. He has no symptoms and reasonable health. What is the most appropriate management?
- Immediate open repair
- Periodic ultrasound surveillance with risk-factor control
- Urgent endovascular repair within 24 hours
- Begin chemotherapy
Correct answer: Periodic ultrasound surveillance with risk-factor control
Periodic ultrasound surveillance with risk-factor control is most appropriate. An asymptomatic aneurysm below roughly 5.5 cm in men is monitored with serial imaging and smoking cessation and blood-pressure control, with repair reserved for larger size, rapid growth, or symptoms. Immediate or urgent repair is not indicated at this diameter, and chemotherapy is irrelevant.
- A 74-year-old man has an asymptomatic abdominal aortic aneurysm that has reached 5.6 cm. Given the size threshold, what is the appropriate recommendation?
- Continued annual surveillance only
- No further follow-up needed
- Elective aneurysm repair
- Repair only if it ruptures
Correct answer: Elective aneurysm repair
Elective aneurysm repair is appropriate. Once an abdominal aortic aneurysm reaches about 5.5 cm in men or grows rapidly, the rupture risk justifies elective repair, which is far safer than emergency surgery for rupture. Ongoing surveillance, no follow-up, or waiting for rupture would all expose the patient to avoidable mortality.
- A 25-year-old man with a tibial shaft fracture develops severe leg pain that is dramatically worsened by passive stretching of the toes and is out of proportion to his injury. What is the earliest and most reliable clinical sign of acute compartment syndrome?
- Pulselessness
- Paralysis
- Pallor
- Pain with passive stretch
Correct answer: Pain with passive stretch
Pain with passive stretch is the earliest and most reliable sign of acute compartment syndrome. Among the classic six Ps, pain out of proportion and worsened by stretching the involved muscles appears first, whereas pulselessness, paralysis, and pallor are late findings that signal already-advanced ischemia.
- A 30-year-old man sustains a crush injury and acute compartment syndrome of the leg is diagnosed clinically. What is the definitive treatment?
- Emergent fasciotomy
- Limb elevation above the heart
- Application of a tight compressive wrap
- Observation with serial pressure checks
Correct answer: Emergent fasciotomy
Emergent fasciotomy is the definitive treatment. Surgically releasing the fascial compartments relieves the pressure and restores perfusion before irreversible muscle and nerve damage occur. Elevation can reduce perfusion pressure, tight wraps worsen the problem, and watchful observation risks limb loss once the diagnosis is established.
- An intubated, obtunded trauma patient with a lower-leg fracture cannot report pain, but compartment syndrome is suspected on exam. Which objective measurement helps confirm the diagnosis in a patient who cannot communicate?
- Erythrocyte sedimentation rate
- Intracompartmental pressure measurement
- Serum amylase
- Blood alcohol level
Correct answer: Intracompartmental pressure measurement
Intracompartmental pressure measurement is the objective tool. In a patient who cannot report symptoms, directly measuring compartment pressures, especially the difference between diastolic blood pressure and compartment pressure, supports the diagnosis. Sedimentation rate, amylase, and alcohol level are unrelated to compartment perfusion.
- A 24-year-old man develops compartment syndrome after a circumferential cast was applied to a fractured forearm and tightened by swelling. What is the appropriate immediate first action?
- Tighten the cast for better immobilization
- Lower the limb below the heart
- Remove or split the cast to relieve external pressure
- Administer only oral analgesics and wait
Correct answer: Remove or split the cast to relieve external pressure
Removing or splitting the cast to relieve external pressure is the appropriate first action when a constricting cast contributes to rising compartment pressure. If symptoms persist after decompressing external sources, fasciotomy follows. Tightening the cast, lowering the limb, or merely giving analgesics would worsen ischemia.
- A 65-year-old man is being evaluated before elective hernia repair. He can climb two flights of stairs and walk several blocks without chest pain or dyspnea. How does this functional capacity affect his preoperative cardiac workup?
- He requires coronary angiography before any surgery
- He needs a stress test regardless of function
- Surgery must be canceled indefinitely
- Adequate functional capacity allows proceeding without further cardiac testing
Correct answer: Adequate functional capacity allows proceeding without further cardiac testing
Adequate functional capacity allows proceeding without further cardiac testing. The ability to perform about four metabolic equivalents, such as climbing two flights of stairs, indicates good cardiac reserve, so additional testing is generally unnecessary for elective surgery. Angiography and stress testing are reserved for poor functional capacity with active risk, and cancellation is not warranted.
- A 68-year-old man received a drug-eluting coronary stent two months ago and is on dual antiplatelet therapy. He needs an elective, nonurgent operation. What is the most appropriate recommendation regarding timing?
- Delay elective surgery until the recommended antiplatelet duration is complete
- Proceed immediately and stop both antiplatelet agents
- Cancel all future surgery permanently
- Operate now and double the antiplatelet dose
Correct answer: Delay elective surgery until the recommended antiplatelet duration is complete
Delaying elective surgery until the recommended antiplatelet duration is complete is most appropriate. Stopping dual antiplatelet therapy too soon after a recent drug-eluting stent risks catastrophic stent thrombosis, so nonurgent operations are postponed until the minimum therapy period passes. Proceeding immediately off therapy, permanent cancellation, or dose-doubling are all incorrect.
- A patient is undergoing preoperative cardiac risk stratification using a validated index that counts factors such as high-risk surgery, ischemic heart disease, heart failure, cerebrovascular disease, insulin-dependent diabetes, and renal insufficiency. Which index is this?
- Glasgow Coma Scale
- Revised Cardiac Risk Index
- MELD score
- CURB-65 score
Correct answer: Revised Cardiac Risk Index
The Revised Cardiac Risk Index is the tool described, tallying those six clinical predictors to estimate perioperative cardiac risk. The Glasgow Coma Scale measures consciousness, the MELD score grades liver disease severity, and CURB-65 assesses pneumonia disposition.
- A 70-year-old man on a long-standing beta-blocker for hypertension is scheduled for elective surgery. What is the appropriate perioperative recommendation regarding the beta-blocker?
- Stop it abruptly the morning of surgery
- Start a brand-new high-dose beta-blocker on the day of surgery
- Continue the beta-blocker through the perioperative period
- Replace it with a diuretic on the day of surgery
Correct answer: Continue the beta-blocker through the perioperative period
Continuing the beta-blocker through the perioperative period is appropriate. Patients already on chronic beta-blockade should not have it stopped, because abrupt withdrawal can cause rebound ischemia and arrhythmia. Acutely starting high-dose beta-blockade on the day of surgery is harmful and is not recommended.
- A 40-year-old man presents with a tender, irreducible inguinal hernia with overlying skin erythema, severe pain, and signs suggesting strangulation. What is the most appropriate management?
- Outpatient observation with a truss
- Manual reduction followed by discharge
- Antibiotics alone without surgery
- Emergent surgical exploration and repair
Correct answer: Emergent surgical exploration and repair
Emergent surgical exploration and repair is most appropriate. A strangulated hernia threatens bowel viability and requires urgent operation to assess and, if needed, resect compromised bowel. A truss, simple reduction with discharge, or antibiotics alone would risk bowel necrosis and perforation.
- A 45-year-old woman has CT-confirmed acute uncomplicated diverticulitis with localized inflammation but no abscess, perforation, or obstruction, and she is clinically stable. What is the most appropriate management?
- Supportive care with antibiotics in selected cases and observation
- Immediate sigmoid colectomy
- Emergent laparotomy
- Total abdominal colectomy
Correct answer: Supportive care with antibiotics in selected cases and observation
Supportive care with observation, with antibiotics in selected cases, is most appropriate for acute uncomplicated diverticulitis. Surgery is avoided in this stable, noncomplicated presentation, illustrating the principle of not operating when nonoperative management suffices. Colectomy and laparotomy are reserved for complications such as perforation or failure of medical therapy.
- A 58-year-old man has diverticulitis complicated by free intraperitoneal air, diffuse peritonitis, and hemodynamic instability. What is the most appropriate management?
- Continued bowel rest and oral antibiotics
- Emergent surgical intervention
- Discharge with outpatient follow-up
- Colonoscopy during the acute episode
Correct answer: Emergent surgical intervention
Emergent surgical intervention is most appropriate. Free air, diffuse peritonitis, and instability indicate perforated, complicated diverticulitis that mandates an operation. This contrasts sharply with uncomplicated disease managed nonoperatively; outpatient discharge and acute colonoscopy would be unsafe.
- A stable 30-year-old man has a low-grade splenic laceration after blunt trauma, with no ongoing bleeding and stable vital signs and hemoglobin. What is the most appropriate management?
- Immediate splenectomy
- Emergent laparotomy regardless of stability
- Nonoperative management with close monitoring
- Discharge home immediately
Correct answer: Nonoperative management with close monitoring
Nonoperative management with close monitoring is most appropriate for a stable patient with a low-grade splenic injury. Preserving the spleen avoids the long-term infection risk of splenectomy, and surgery is reserved for hemodynamic instability or failure of observation. Immediate splenectomy or laparotomy would be unnecessary, and discharge is premature.
- A 52-year-old man has severe gallstone pancreatitis, and imaging now shows infected, walled-off pancreatic necrosis with clinical deterioration despite antibiotics. What is the generally preferred initial approach to the infected necrosis?
- Immediate open necrosectomy in all cases
- Indefinite antibiotics without any drainage
- Total pancreatectomy as the first step
- A step-up approach beginning with drainage rather than immediate open necrosectomy
Correct answer: A step-up approach beginning with drainage rather than immediate open necrosectomy
A step-up approach beginning with drainage rather than immediate open necrosectomy is generally preferred. Starting with percutaneous or endoscopic drainage and escalating only if needed reduces morbidity compared with upfront open surgery for infected necrosis. Immediate open necrosectomy, antibiotics alone, or total pancreatectomy are not the favored initial strategy.
- A surgeon considers whether to operate on a patient with an acute abdomen. Which finding is the clearest indication that immediate operative intervention is required rather than observation?
- Diffuse peritonitis with free intraperitoneal air
- Mild, localized tenderness that is improving
- An incidental small reducible hernia
- Resolving postoperative ileus
Correct answer: Diffuse peritonitis with free intraperitoneal air
Diffuse peritonitis with free intraperitoneal air is the clearest indication for immediate operation, signaling perforation of a hollow viscus. Improving localized tenderness, an incidental reducible hernia, and a resolving ileus are all situations where observation or elective planning, not emergency surgery, is appropriate.
- A 35-year-old woman presents with right lower quadrant pain that strongly suggests appendicitis, but imaging and labs are equivocal and her symptoms are improving with observation over several hours. What does this scenario best illustrate about surgical decision-making?
- All patients with right lower quadrant pain require immediate appendectomy
- Selective observation can avoid unnecessary operation when the diagnosis is unclear and the patient improves
- Imaging should never influence the decision to operate
- Observation is always safer than surgery in any abdominal pain
Correct answer: Selective observation can avoid unnecessary operation when the diagnosis is unclear and the patient improves
Selective observation avoiding unnecessary operation when the diagnosis is unclear and the patient improves is the principle illustrated. A core Step 2 CK surgical theme is balancing the harm of missed disease against the harm of needless surgery, using serial exams and imaging. Mandatory immediate surgery and disregarding imaging are both wrong, and observation is not universally safer.
- A 30-year-old man presents with one day of right lower quadrant pain, anorexia, and a low-grade fever. While the examiner passively extends his right hip with the patient lying on his side, he reports increased right lower quadrant pain. What is the name of this maneuver and what does it suggest?
- Murphy sign suggesting cholecystitis
- Cullen sign suggesting pancreatitis
- Psoas sign suggesting a retrocecal inflamed appendix
- Kehr sign suggesting splenic rupture
Correct answer: Psoas sign suggesting a retrocecal inflamed appendix
Psoas sign suggesting a retrocecal inflamed appendix is correct. Pain on passive hip extension reflects irritation of the iliopsoas muscle by an inflamed retrocecal appendix. Murphy sign indicates gallbladder disease, Cullen sign is periumbilical bruising, and Kehr sign is referred shoulder pain from diaphragmatic irritation.
- A 9-year-old boy is brought in with several hours of periumbilical pain that migrated to the right lower quadrant, fever, and vomiting. He now has diffuse abdominal rigidity and rebound, and he appears toxic. What complication of appendicitis should be suspected?
- Simple early appendicitis
- Mesenteric adenitis
- Functional abdominal pain
- Perforation with peritonitis
Correct answer: Perforation with peritonitis
Perforation with peritonitis should be suspected. Diffuse rigidity, generalized rebound, and a toxic appearance after the typical migratory pain indicate that the appendix has ruptured and caused peritonitis, which requires prompt resuscitation, antibiotics, and surgery. This is more advanced than simple early appendicitis, and the diffuse peritoneal signs exclude benign mesenteric adenitis or functional pain.
- A 55-year-old man is recovering from an adhesive small bowel obstruction managed nonoperatively and now passes flatus and stool, with resolving distention and a normal abdominal exam. What is the most appropriate next step?
- Gradually advance the diet
- Take him to emergency surgery
- Keep him strictly nil by mouth indefinitely
- Begin total parenteral nutrition permanently
Correct answer: Gradually advance the diet
Gradually advancing the diet is most appropriate. Return of flatus and stool with resolving distention signals that the obstruction has resolved, so feeding can be carefully resumed. Surgery is unnecessary once the obstruction clears, and indefinite fasting or permanent parenteral nutrition is not warranted.
- A 67-year-old woman with a known intra-abdominal malignancy develops a complete small bowel obstruction. CT shows a transition point at a mass with no signs of ischemia. Compared with adhesive obstruction, what is a key consideration in this malignant obstruction?
- Nonoperative management is never appropriate
- Surgery is less likely to provide durable relief and goals of care must be weighed
- It always resolves spontaneously within hours
- It carries no risk of recurrence
Correct answer: Surgery is less likely to provide durable relief and goals of care must be weighed
Surgery is less likely to provide durable relief and goals of care must be weighed is the key consideration. Malignant bowel obstruction often recurs and may not be fixed by an operation, so management is individualized with attention to prognosis and palliation. It does not reliably resolve on its own, and recurrence risk is high.
- A 60-year-old woman with acute cholecystitis develops worsening fever with rigors, jaundice, and right upper quadrant pain, and laboratory tests show elevated bilirubin. What complication does this triad of fever, jaundice, and right upper quadrant pain suggest?
- Uncomplicated biliary colic
- Acute appendicitis
- Ascending cholangitis
- Hepatic steatosis
Correct answer: Ascending cholangitis
Ascending cholangitis is suggested by Charcot triad of fever, jaundice, and right upper quadrant pain, indicating infection of an obstructed biliary tree. It requires antibiotics and biliary decompression. Simple biliary colic lacks fever and jaundice, and appendicitis or steatosis do not produce this triad.
- A 78-year-old critically ill man in the intensive care unit who has been fasting and on parenteral nutrition develops fever, right upper quadrant pain, and ultrasound shows gallbladder wall thickening and pericholecystic fluid but no stones. What is the diagnosis?
- Calculous cholecystitis
- Choledocholithiasis
- Gallbladder polyp
- Acalculous cholecystitis
Correct answer: Acalculous cholecystitis
Acalculous cholecystitis is the diagnosis. Gallbladder inflammation without stones, classically in critically ill, fasting, or parenterally fed patients, results from bile stasis and ischemia and carries a high complication rate. The absence of stones distinguishes it from calculous cholecystitis and choledocholithiasis, and the inflammatory findings exclude a simple polyp.
- During the airway step of a trauma evaluation, a patient with a severe facial injury and an expanding neck hematoma cannot maintain a patent airway, and orotracheal intubation is unsuccessful. What is the most appropriate next step?
- Surgical cricothyroidotomy
- Repeated attempts at oral intubation indefinitely
- Proceed directly to the circulation step
- Insert a nasogastric tube
Correct answer: Surgical cricothyroidotomy
Surgical cricothyroidotomy is the most appropriate next step. When the airway cannot be secured by intubation in a patient with facial trauma and a distorting neck hematoma, a surgical airway is required to establish ventilation. Endless intubation attempts or skipping to circulation would leave the airway unprotected, and a nasogastric tube does not provide an airway.
- A 35-year-old man develops compartment syndrome of the forearm hours after a supracondylar humerus fracture, and treatment is delayed. If ischemia is not relieved, which late complication of untreated compartment syndrome may develop?
- Resolution with full function
- Volkmann ischemic contracture
- Improved muscle strength
- Spontaneous nerve regeneration without deficit
Correct answer: Volkmann ischemic contracture
Volkmann ischemic contracture may develop. Prolonged ischemia from untreated compartment syndrome leads to muscle necrosis and fibrosis, producing a permanent flexion contracture of the wrist and fingers. Untreated compartment syndrome does not resolve with full function or improved strength, and the nerve damage is typically not fully reversible.
- A 60-year-old man is being assessed before major elective vascular surgery and has poor functional capacity along with active, unstable angina. According to perioperative principles, what is the most appropriate course?
- Proceed with surgery immediately without intervention
- Cancel the operation permanently regardless of evaluation
- Delay elective surgery and address the active cardiac condition first
- Ignore the angina because it is unrelated to surgery
Correct answer: Delay elective surgery and address the active cardiac condition first
Delaying elective surgery and addressing the active cardiac condition first is most appropriate. Unstable angina is an active cardiac condition that must be evaluated and stabilized before nonurgent surgery to reduce perioperative cardiac events. Proceeding without intervention or ignoring the angina would be dangerous, and permanent cancellation is not the correct framing.
