- Under HIPAA, what type of information is classified as protected health information (PHI)?
- Aggregated statistics that cannot be traced to an individual
- Only information stored in an electronic medical record
- Only a patient's Social Security number
- Any individually identifiable health information held or transmitted by a covered entity
Correct answer: Any individually identifiable health information held or transmitted by a covered entity
Any individually identifiable health information held or transmitted by a covered entity is protected health information under HIPAA. PHI covers a broad range of identifiers tied to a person's health, not just one number, and it applies whether the data is electronic, paper, or spoken.
- An EKG technician overhears a coworker discussing a celebrity patient's cardiac results in a crowded hospital cafeteria. Which principle is being violated?
- Informed consent requirements
- HIPAA minimum necessary and confidentiality standards
- OSHA hazard communication
- The Good Samaritan law
Correct answer: HIPAA minimum necessary and confidentiality standards
HIPAA minimum necessary and confidentiality standards are being violated. Discussing a patient's protected health information in a public area where it can be overheard breaches the duty to safeguard PHI and disclose only the minimum information necessary for care.
- A patient asks the EKG technician for a copy of his own EKG tracing. What is the most appropriate response?
- Refuse because patients are never allowed to see their records
- Explain that he has a right to his records and direct him to the proper medical-records process
- Hand the tracing directly to the patient immediately
- Tell him only his physician can ever view the tracing
Correct answer: Explain that he has a right to his records and direct him to the proper medical-records process
Explaining that the patient has a right to his records and directing him to the proper medical-records process is correct. HIPAA gives patients the right to access their health information, but release follows the facility's formal records procedure rather than an on-the-spot handoff by the technician.
- Which scenario represents a permissible disclosure of protected health information without separate patient authorization?
- Providing EKG results to the ordering physician for treatment
- Posting a patient's rhythm strip on social media for education
- Sharing EKG results with a marketing company
- Telling a patient's coworker about the diagnosis
Correct answer: Providing EKG results to the ordering physician for treatment
Providing EKG results to the ordering physician for treatment is a permissible disclosure. HIPAA allows sharing PHI for treatment, payment, and health care operations without separate authorization, whereas marketing, social media, and casual disclosures are prohibited.
- Universal (standard) precautions are based on the assumption that:
- All blood and body fluids are potentially infectious
- Hand hygiene is optional if gloves are worn
- Gloves are only needed when blood is visible
- Only patients with known infections are contagious
Correct answer: All blood and body fluids are potentially infectious
Standard precautions assume that all blood and body fluids are potentially infectious. This approach requires consistent protective measures with every patient regardless of known diagnosis, because infection status is often unknown.
- Which OSHA standard specifically governs employee protection from exposure to blood and other potentially infectious materials?
- The Hazard Communication Standard
- The Emergency Action Plan Standard
- The Respiratory Protection Standard
- The Bloodborne Pathogens Standard
Correct answer: The Bloodborne Pathogens Standard
The Bloodborne Pathogens Standard governs protection from exposure to blood and other potentially infectious materials. It mandates exposure control plans, personal protective equipment, and hepatitis B vaccination for at-risk workers.
- What is the single most effective measure for preventing the spread of infection between patients during EKG testing?
- Using a surgical mask at all times
- Wearing two pairs of gloves
- Wearing a gown for every patient
- Performing proper hand hygiene
Correct answer: Performing proper hand hygiene
Performing proper hand hygiene is the single most effective infection-prevention measure. Cleaning hands before and after patient contact interrupts the transmission of organisms more reliably than any single piece of protective equipment.
- An EKG technician must apply electrodes to a patient who is in contact isolation for a multidrug-resistant organism. What action best follows infection-control practice?
- Skip the EKG to avoid entering the room
- Wear only gloves and reuse the same lead wires on the next patient without cleaning
- Enter without protective equipment since the EKG is brief
- Don a gown and gloves before entering and remove them before leaving
Correct answer: Don a gown and gloves before entering and remove them before leaving
Donning a gown and gloves before entering and removing them before leaving is correct. Contact precautions require appropriate personal protective equipment that is put on before patient contact and removed prior to exiting to prevent carrying organisms out of the room.
- After accidentally sticking herself with a contaminated lancet, the EKG technician should first:
- Wait until the end of the shift to mention it
- Squeeze the wound and ignore reporting
- Wash the area with soap and water and report the exposure immediately
- Apply a bandage and continue working
Correct answer: Wash the area with soap and water and report the exposure immediately
Washing the area with soap and water and reporting the exposure immediately is the correct first action. Prompt cleansing and reporting allow timely post-exposure evaluation and prophylaxis according to the facility's bloodborne pathogen plan.
- Reusable EKG lead wires that contact a patient's skin should be:
- Rinsed only with plain water once a week
- Discarded after every single use
- Cleaned or disinfected between patients per facility policy
- Left as-is between patients to save time
Correct answer: Cleaned or disinfected between patients per facility policy
Cleaning or disinfecting reusable lead wires between patients per facility policy is correct. Items that touch intact skin must be cleaned to prevent cross-contamination, even though they are not disposable like single-use electrodes.
- Which task falls within the scope of practice of a certified EKG technician?
- Acquiring a technically accurate 12-lead EKG tracing
- Interpreting the EKG and diagnosing the arrhythmia for the chart
- Ordering a stress test independently
- Adjusting the patient's cardiac medications
Correct answer: Acquiring a technically accurate 12-lead EKG tracing
Acquiring a technically accurate 12-lead EKG tracing is within the technician's scope. EKG technicians obtain quality recordings and recognize patterns to alert clinicians, but diagnosing, prescribing, and ordering tests fall to licensed providers.
- While performing an EKG, a patient asks the technician, 'Does this tracing mean I'm having a heart attack?' What is the most appropriate response within scope of practice?
- Provide a diagnosis based on the ST segments
- Recommend a specific cardiac medication
- State definitively whether or not it is a heart attack
- Reassure the patient that the physician will review the tracing and discuss the results
Correct answer: Reassure the patient that the physician will review the tracing and discuss the results
Reassuring the patient that the physician will review the tracing and discuss the results is appropriate. Offering a diagnosis exceeds the technician's scope, so directing diagnostic questions to the provider keeps the technician within professional limits.
- An EKG technician notices a run of wide, bizarre complexes consistent with ventricular tachycardia on a monitored patient. The correct scope-appropriate action is to:
- Administer an antiarrhythmic medication
- Document it and wait until the next shift
- Tell the patient he has a fatal rhythm
- Notify the nurse or physician immediately
Correct answer: Notify the nurse or physician immediately
Notifying the nurse or physician immediately is the scope-appropriate action. Technicians recognize dangerous patterns and escalate them promptly to licensed clinicians, but they do not administer medications or deliver diagnoses.
- Which of the following is generally outside the scope of practice of an EKG technician?
- Preparing the skin for electrode placement
- Independently altering the diagnostic interpretation in the medical record
- Verifying the patient's identity before testing
- Explaining how to lie still during the recording
Correct answer: Independently altering the diagnostic interpretation in the medical record
Independently altering the diagnostic interpretation in the medical record is outside the technician's scope. Interpretation and documentation of diagnoses belong to licensed providers, while preparation, identification, and patient instruction are technician responsibilities.
- According to the NHA Code of Ethics, an EKG technician who is asked to perform a procedure she has not been trained to do should:
- Attempt it to avoid appearing incompetent
- Delegate it to a patient's family member
- Decline and inform a supervisor that she lacks the required training
- Perform it once and then learn from the result
Correct answer: Decline and inform a supervisor that she lacks the required training
Declining and informing a supervisor that she lacks the required training is the ethical action. Practicing only within one's demonstrated competence and being honest about limitations protects patient safety and upholds professional integrity.
- An EKG technician realizes she mislabeled a tracing with the wrong patient's name. The ethical course of action is to:
- Ask the patient to keep it confidential
- Report and correct the mislabeling immediately
- Discard the tracing and say nothing
- Leave the error so no one notices
Correct answer: Report and correct the mislabeling immediately
Reporting and correcting the mislabeling immediately is the ethical course of action. Honesty and accountability for one's work prevent a wrong-patient error from causing harm and reflect the professional standards expected of certified technicians.
- Which behavior best demonstrates professional integrity for an EKG technician?
- Accepting gifts in exchange for falsifying records
- Sharing login credentials with coworkers for convenience
- Recording results accurately even when the workload is heavy
- Charting an EKG as 'done' when it was not performed
Correct answer: Recording results accurately even when the workload is heavy
Recording results accurately even when the workload is heavy demonstrates professional integrity. Truthful, accurate documentation regardless of pressure protects patients and is a foundation of ethical clinical practice.
- A technician observes a coworker bypassing identity verification to speed up testing. The most professional response is to:
- Ignore it because it is not her patient
- Join in to keep pace with the workload
- Address the safety concern and report it through proper channels
- Confront the coworker loudly in front of patients
Correct answer: Address the safety concern and report it through proper channels
Addressing the safety concern and reporting it through proper channels is the most professional response. Advocating for patient safety and following facility reporting procedures upholds ethical duties without creating an unprofessional public confrontation.
- When communicating with a patient who speaks limited English, the most appropriate action is to:
- Speak louder in English until understood
- Have a young child translate for the patient
- Skip explaining the procedure entirely
- Use a qualified medical interpreter
Correct answer: Use a qualified medical interpreter
Using a qualified medical interpreter is most appropriate. Professional interpretation ensures accurate communication of instructions and consent, whereas raising one's voice or relying on a child can produce errors and breach confidentiality.
- An EKG technician is preparing to test a 4-year-old child. Which communication approach is most developmentally appropriate?
- Use detailed medical terminology to explain the leads
- Use simple words, a calm tone, and let the child see a sticker electrode first
- Tell the child nothing and proceed quickly
- Warn the child the procedure will be painful
Correct answer: Use simple words, a calm tone, and let the child see a sticker electrode first
Using simple words, a calm tone, and letting the child see a sticker electrode first is most appropriate. Matching the explanation to the child's developmental level reduces fear and improves cooperation during the recording.
- A patient appears anxious and culturally hesitant about removing clothing for electrode placement. The technician should:
- Document that the patient refused without further effort
- Respect modesty by providing a gown and draping while explaining the need for exposure
- Insist the patient comply immediately
- Skip the chest leads to avoid discomfort
Correct answer: Respect modesty by providing a gown and draping while explaining the need for exposure
Respecting modesty by providing a gown and draping while explaining the need for exposure is correct. Acknowledging cultural and personal sensitivities while clearly explaining the clinical necessity supports both dignity and an accurate recording.
- When communicating with a patient who is hard of hearing, the EKG technician should:
- Rely only on written notes without speaking
- Avoid eye contact to seem less intimidating
- Face the patient, speak clearly, and confirm understanding
- Shout from across the room
Correct answer: Face the patient, speak clearly, and confirm understanding
Facing the patient, speaking clearly, and confirming understanding is the correct approach. Allowing the patient to read lips and verifying comprehension improves communication far more effectively than shouting or avoiding interaction.
- Which of the following is considered a normal resting heart rate for a healthy adult?
- 130 beats per minute
- 160 beats per minute
- 72 beats per minute
- 35 beats per minute
Correct answer: 72 beats per minute
A resting heart rate of 72 beats per minute is normal for a healthy adult. The accepted adult resting range is approximately 60 to 100 beats per minute, so 72 falls comfortably within normal limits.
- A newborn infant typically has a resting heart rate in which range?
- 100 to 160 beats per minute
- 60 to 100 beats per minute
- 200 to 240 beats per minute
- 40 to 60 beats per minute
Correct answer: 100 to 160 beats per minute
A newborn's normal resting heart rate is approximately 100 to 160 beats per minute. Heart rate is highest at birth and gradually declines with age, so neonatal rates far exceed normal adult values.
- Which adult blood pressure reading is classified as normal according to current guidelines?
- 160/100 mmHg
- 142/92 mmHg
- 118/76 mmHg
- 90/40 mmHg
Correct answer: 118/76 mmHg
A reading of 118/76 mmHg is classified as normal. Current guidelines define normal adult blood pressure as below 120/80 mmHg, so this value falls within the normal category.
- A normal respiratory rate for a resting healthy adult is approximately:
- 4 to 6 breaths per minute
- 30 to 40 breaths per minute
- 45 to 55 breaths per minute
- 12 to 20 breaths per minute
Correct answer: 12 to 20 breaths per minute
A normal resting adult respiratory rate is approximately 12 to 20 breaths per minute. Rates well below or above this range may indicate respiratory compromise and warrant clinical attention.
- An EKG technician measures an adult patient's heart rate at 48 beats per minute. This finding is best described as:
- A normal resting rate
- Tachycardia
- Bradycardia
- An impossible reading
Correct answer: Bradycardia
A heart rate of 48 beats per minute is bradycardia. Because the normal adult resting range is 60 to 100 beats per minute, a rate below 60 is classified as bradycardia and may need to be reported.
- Compared with adults, children generally have:
- Slower heart rates and higher blood pressures
- No measurable respiratory rate
- Faster heart rates and lower blood pressures
- Identical vital signs to adults
Correct answer: Faster heart rates and lower blood pressures
Children generally have faster heart rates and lower blood pressures than adults. Normal vital sign ranges shift with age, so technicians must interpret pediatric values against age-appropriate norms rather than adult standards.
- Before a cardiac stress test, patients are commonly instructed to:
- Eat a large meal immediately beforehand
- Wear comfortable clothing and walking shoes
- Apply lotion to the chest the morning of the test
- Take an extra dose of caffeine for energy
Correct answer: Wear comfortable clothing and walking shoes
Wearing comfortable clothing and walking shoes is a standard stress-test instruction. Because the test usually involves treadmill or bicycle exercise, appropriate attire allows the patient to exercise safely and reach the target heart rate.
- A patient scheduled for an exercise stress test asks what to avoid beforehand. The technician should advise the patient to:
- Drink several cups of coffee to raise the heart rate
- Stop drinking water for 24 hours
- Exercise vigorously the night before
- Avoid caffeine and follow physician instructions about withholding certain medications
Correct answer: Avoid caffeine and follow physician instructions about withholding certain medications
Advising the patient to avoid caffeine and follow physician instructions about withholding certain medications is correct. Caffeine and certain cardiac medications can affect heart rate and test interpretation, so these are commonly restricted before stress testing.
- Why is chest skin preparation, including shaving excess hair when needed, important before a stress test?
- It is required by HIPAA
- It improves electrode adhesion and signal quality during exercise
- It makes the test more comfortable only
- It eliminates the need for a physician to be present
Correct answer: It improves electrode adhesion and signal quality during exercise
Improving electrode adhesion and signal quality during exercise is why skin preparation matters before a stress test. Sweating and movement during exercise easily dislodge poorly attached electrodes, so good preparation keeps the tracing readable.
- During a treadmill stress test, the EKG technician should instruct the patient to immediately report:
- Chest pain, severe shortness of breath, or dizziness
- A desire to walk faster
- Mild leg fatigue from walking
- Feeling slightly warm
Correct answer: Chest pain, severe shortness of breath, or dizziness
Instructing the patient to immediately report chest pain, severe shortness of breath, or dizziness is correct. These symptoms can signal cardiac compromise and may require stopping the test, so prompt reporting is essential for safety.
- A Holter monitor is best described as a device that:
- Records a single 12-lead EKG and stops
- Continuously records the heart's electrical activity, typically for 24 to 48 hours
- Measures only blood pressure over time
- Delivers shocks to correct arrhythmias
Correct answer: Continuously records the heart's electrical activity, typically for 24 to 48 hours
A Holter monitor continuously records the heart's electrical activity, typically for 24 to 48 hours. This ambulatory device captures rhythm during daily activities to detect intermittent abnormalities a brief office EKG might miss.
- When instructing a patient on Holter monitor use, the technician should explain that the patient should:
- Remove the device whenever it is inconvenient
- Keep a diary of activities and symptoms during the recording period
- Take long baths to test waterproofing
- Reposition the electrodes randomly throughout the day
Correct answer: Keep a diary of activities and symptoms during the recording period
Explaining that the patient should keep a diary of activities and symptoms during the recording period is correct. Correlating logged symptoms and activities with the recorded rhythm helps clinicians link events to any abnormalities found.
- A patient wearing a Holter monitor asks whether he can shower with it. The technician's best instruction is to:
- Submerge the device to clean it
- Remove all electrodes and reapply them after showering
- Avoid getting the monitor wet unless it is specifically labeled waterproof
- Shower normally with the device attached
Correct answer: Avoid getting the monitor wet unless it is specifically labeled waterproof
Advising the patient to avoid getting the monitor wet unless it is specifically labeled waterproof is correct. Most standard Holter recorders are not waterproof, and moisture can damage the device or disrupt the recording.
- The primary purpose of ambulatory monitoring such as a Holter monitor is to:
- Deliver pacing to the heart
- Detect intermittent arrhythmias that occur during normal daily activity
- Replace the standard 12-lead EKG entirely
- Measure cholesterol levels
Correct answer: Detect intermittent arrhythmias that occur during normal daily activity
Detecting intermittent arrhythmias that occur during normal daily activity is the primary purpose of ambulatory monitoring. A snapshot EKG may appear normal, so continuous recording over time captures fleeting events.
- How does an event monitor differ from a standard Holter monitor?
- It cannot record any heart activity
- It can only be worn for one hour
- It measures only respiratory rate
- It records when the patient activates it or when a triggering event is detected, often over weeks
Correct answer: It records when the patient activates it or when a triggering event is detected, often over weeks
An event monitor records when the patient activates it or when a triggering event is detected, often over a period of weeks. This longer, event-driven approach captures infrequent symptoms that a 24- to 48-hour Holter might miss.
- A patient with rare, unpredictable palpitations is most appropriately monitored with which device?
- An event monitor worn over an extended period
- A single resting 12-lead EKG
- A one-time blood pressure cuff reading
- A pulse oximeter only
Correct answer: An event monitor worn over an extended period
An event monitor worn over an extended period is most appropriate for rare, unpredictable palpitations. Because symptoms occur infrequently, a device that records over weeks and can be triggered by the patient is more likely to capture the event.
- When teaching a patient to use a patient-activated event monitor, the technician should emphasize that the patient should:
- Only wear the device while sleeping
- Never use the record button
- Press the record button when symptoms occur
- Remove the device whenever symptoms start
Correct answer: Press the record button when symptoms occur
Emphasizing that the patient should press the record button when symptoms occur is correct. Patient activation captures the rhythm during the symptomatic episode, providing clinicians with the data needed to correlate symptoms with cardiac activity.
- When entering a completed EKG and patient data into the electronic medical record, the technician must ensure that:
- The data is saved under a generic test account
- Only the time of day is recorded
- The interpretation is omitted entirely
- The entry is linked to the correct patient and accurately documented
Correct answer: The entry is linked to the correct patient and accurately documented
Ensuring the entry is linked to the correct patient and accurately documented is essential. Correct patient association and accurate data entry prevent wrong-patient errors and maintain the integrity of the medical record.
- An EKG technician realizes she logged a patient's blood pressure incorrectly in the EHR. The correct way to fix it is to:
- Use the system's correction process to amend the entry while preserving the original audit trail
- Delete the record so the error disappears
- Write the correction on a sticky note
- Ask another staff member to alter it secretly
Correct answer: Use the system's correction process to amend the entry while preserving the original audit trail
Using the system's correction process to amend the entry while preserving the original audit trail is correct. Proper EHR amendments document the change transparently, maintaining a legally sound and accurate record rather than erasing data.
- Which information is appropriate for the EKG technician to enter into the EMR before or after performing an EKG?
- A diagnosis of the patient's condition
- The technician's personal opinion of the patient
- The patient's pertinent history, medications, vital signs, and the completed tracing
- Unverified rumors about the patient
Correct answer: The patient's pertinent history, medications, vital signs, and the completed tracing
Entering the patient's pertinent history, medications, vital signs, and the completed tracing is appropriate. These factual clinical data points support interpretation, while diagnoses and opinions fall outside the technician's documentation role.
- Why should an EKG technician log out of the EMR when stepping away from the workstation?
- Because it is required to start a stress test
- To prevent unauthorized access to protected health information
- To reset the EKG machine
- To conserve electricity
Correct answer: To prevent unauthorized access to protected health information
Logging out to prevent unauthorized access to protected health information is correct. Leaving an active session unattended could allow others to view or alter PHI, which violates confidentiality and security requirements.
- A patient suddenly reports crushing chest pain and breaks out in a cold sweat during an EKG. The technician should:
- Send the patient home to rest
- Recognize possible cardiac compromise and summon help immediately
- Tell the patient the pain is likely heartburn
- Finish the routine paperwork first
Correct answer: Recognize possible cardiac compromise and summon help immediately
Recognizing possible cardiac compromise and summoning help immediately is correct. Crushing chest pain with diaphoresis can indicate a serious cardiac event, so rapid escalation to clinical staff takes priority over routine tasks.
- Which set of findings most strongly suggests a patient is experiencing cardiopulmonary compromise?
- Chest pain, shortness of breath, and pallor
- Pink skin, steady gait, normal speech
- Mild thirst and a slight headache
- A calm demeanor and normal vital signs
Correct answer: Chest pain, shortness of breath, and pallor
Chest pain, shortness of breath, and pallor most strongly suggest cardiopulmonary compromise. This combination points to inadequate oxygen delivery or cardiac distress and warrants immediate clinical attention.
- A patient becomes lightheaded, pale, and then briefly loses consciousness while seated for an EKG. This event is best described as:
- Syncope
- Bradypnea
- Tachypnea
- Hypertension
Correct answer: Syncope
This event is best described as syncope. Syncope is a transient loss of consciousness caused by reduced blood flow to the brain, and recognizing it allows the technician to protect the patient and alert clinical staff.
- If a patient suddenly becomes unresponsive and is not breathing normally during testing, the EKG technician's first priority is to:
- Remove the electrodes and store the machine
- Document the time and leave the room
- Complete the EKG tracing
- Activate the emergency response system and prepare to begin CPR
Correct answer: Activate the emergency response system and prepare to begin CPR
Activating the emergency response system and preparing to begin CPR is the first priority. An unresponsive, non-breathing patient requires immediate emergency activation and basic life support to maximize the chance of survival.
- During adult CPR, the recommended chest compression depth is at least:
- Compressions are not part of CPR
- About 1/4 inch
- About 2 inches (5 cm)
- About 5 inches
Correct answer: About 2 inches (5 cm)
The recommended adult chest compression depth is at least about 2 inches (5 cm). Adequate depth generates enough blood flow to vital organs, while too shallow compressions are ineffective.
- The recommended rate of chest compressions during adult CPR is:
- 60 to 80 per minute
- 160 to 180 per minute
- 20 to 40 per minute
- 100 to 120 per minute
Correct answer: 100 to 120 per minute
The recommended adult compression rate is 100 to 120 per minute. This rate balances adequate circulation with sufficient chest recoil between compressions to allow the heart to refill.
- When an automated external defibrillator (AED) instructs 'do not touch the patient' during analysis, rescuers should:
- Hold the patient's hand for reassurance
- Continue compressions through the analysis
- Remove the AED pads immediately
- Ensure everyone is clear of the patient
Correct answer: Ensure everyone is clear of the patient
Ensuring everyone is clear of the patient is correct. Touching the patient during AED analysis or shock can cause inaccurate readings or injury to rescuers, so all hands must be off the patient.
- Before applying electrodes, verifying the patient's identity using two identifiers primarily serves to:
- Replace the need for a physician order
- Prevent wrong-patient testing and documentation errors
- Satisfy a billing requirement only
- Speed up the testing process
Correct answer: Prevent wrong-patient testing and documentation errors
Verifying identity with two identifiers primarily prevents wrong-patient testing and documentation errors. Confirming identity with two unique identifiers ensures the EKG and its results are attributed to the correct individual.
- A coordinated, multidisciplinary approach to patient care means the EKG technician should:
- Make independent treatment decisions
- Communicate relevant findings clearly to nurses and physicians
- Withhold information from the care team to avoid confusion
- Work in isolation and avoid the care team
Correct answer: Communicate relevant findings clearly to nurses and physicians
Communicating relevant findings clearly to nurses and physicians reflects a coordinated, multidisciplinary approach. Sharing accurate, timely information supports continuity of care and helps the team respond appropriately to the patient's needs.
- Which action best demonstrates proper sharps disposal after an EKG-related procedure?
- Leaving sharps on the counter for later
- Recapping needles by hand
- Discarding sharps in a puncture-resistant, labeled sharps container
- Placing used sharps in a regular trash can
Correct answer: Discarding sharps in a puncture-resistant, labeled sharps container
Discarding sharps in a puncture-resistant, labeled sharps container demonstrates proper disposal. This practice, required under bloodborne pathogen standards, prevents needlestick injuries and the spread of infection.
- A patient with chest pain during an EKG suddenly shows a rhythm consistent with ventricular fibrillation on the monitor and loses consciousness. The technician should interpret this as:
- A normal variant in older adults
- A non-urgent artifact to ignore
- A life-threatening emergency requiring immediate activation of help and CPR/AED
- A reason to simply repeat the tracing
Correct answer: A life-threatening emergency requiring immediate activation of help and CPR/AED
Interpreting this as a life-threatening emergency requiring immediate activation of help and CPR or AED is correct. Ventricular fibrillation with loss of consciousness is a cardiac arrest situation demanding rapid resuscitation efforts.
- Which patient statement should prompt the EKG technician to alert clinical staff before continuing routine testing?
- 'I feel a little nervous about the test.'
- 'I would prefer to lie on my back.'
- 'I'm having squeezing chest pain that goes into my left arm.'
- 'I had a light breakfast this morning.'
Correct answer: 'I'm having squeezing chest pain that goes into my left arm.'
The statement 'I'm having squeezing chest pain that goes into my left arm.' should prompt the technician to alert clinical staff. Chest pain radiating to the arm is a classic warning sign of a possible cardiac event requiring prompt evaluation.
- Which practice best protects patient confidentiality at a shared EKG workstation?
- Positioning the monitor so others cannot read PHI and securing printed tracings
- Discussing results loudly with passing staff
- Using a shared password posted on the wall
- Leaving tracings face-up on the counter
Correct answer: Positioning the monitor so others cannot read PHI and securing printed tracings
Positioning the monitor so others cannot read PHI and securing printed tracings best protects confidentiality. Limiting visual access and safeguarding documents prevents unauthorized disclosure of protected health information.
- An EKG technician is asked by a patient's adult neighbor about the patient's test results. The technician should:
- Share the results since the neighbor seems concerned
- Provide a summary but omit the diagnosis
- Tell the neighbor to read the patient's chart
- Decline to disclose any information without proper authorization
Correct answer: Decline to disclose any information without proper authorization
Declining to disclose any information without proper authorization is correct. HIPAA prohibits releasing PHI to unauthorized individuals, regardless of their stated concern or relationship to the patient.
- Which is the correct sequence for safely removing contaminated gloves and gown after caring for an isolation patient?
- Remove gown and gloves inside the room and perform hand hygiene before exiting
- Remove gloves and gown last, then wash hands before leaving
- Keep gloves on until the next patient
- Leave the room first, then remove gloves in the hallway
Correct answer: Remove gown and gloves inside the room and perform hand hygiene before exiting
Removing the gown and gloves inside the room and performing hand hygiene before exiting is correct. Doffing personal protective equipment before leaving and cleaning hands prevents carrying contamination out of the isolation room.
- A frail older adult patient seems confused about the EKG procedure. The most appropriate communication strategy is to:
- Rush through the explanation to save time
- Skip consent and begin immediately
- Speak slowly, use simple language, and confirm understanding
- Explain everything only to a family member and ignore the patient
Correct answer: Speak slowly, use simple language, and confirm understanding
Speaking slowly, using simple language, and confirming understanding is the most appropriate strategy. Adapting communication to the patient's cognitive and developmental level promotes comprehension, cooperation, and dignity.
- Which adult vital sign reading should be reported promptly as a potential sign of compromise?
- Blood pressure of 116/74 mmHg
- Respiratory rate of 6 breaths per minute
- Temperature of 98.6 degrees Fahrenheit
- Heart rate of 78 beats per minute
Correct answer: Respiratory rate of 6 breaths per minute
A respiratory rate of 6 breaths per minute should be reported promptly. This rate is well below the normal adult range of 12 to 20 breaths per minute and may indicate respiratory compromise requiring evaluation.
- Before a pharmacologic stress test, a patient mentions she drank coffee an hour ago. The technician should:
- Tell the patient the test is now impossible forever
- Give the patient more caffeine to standardize the level
- Proceed without telling anyone
- Inform the supervising clinician, since caffeine can interfere with the test
Correct answer: Inform the supervising clinician, since caffeine can interfere with the test
Informing the supervising clinician, since caffeine can interfere with the test, is correct. Caffeine can blunt the effect of certain pharmacologic stress agents, so the care team needs this information to decide how to proceed.
- A patient returning a Holter monitor reports that one electrode fell off during the night. The technician should:
- Tell the patient it does not matter at all
- Discard the entire recording as useless
- Reattach it and pretend nothing happened
- Note the event and inform the interpreting clinician, since data gaps may affect interpretation
Correct answer: Note the event and inform the interpreting clinician, since data gaps may affect interpretation
Noting the event and informing the interpreting clinician is correct. A dislodged electrode can create gaps or artifact in the recording, and documenting it helps the clinician interpret the available data accurately.
- Why should an EKG technician confirm a physician's order before performing an EKG?
- To ensure the test is authorized and matches the intended patient and procedure
- To set the patient's medication schedule
- To choose which arrhythmia to diagnose
- To bypass identity verification
Correct answer: To ensure the test is authorized and matches the intended patient and procedure
Confirming the order ensures the test is authorized and matches the intended patient and procedure. Verifying the order against the patient prevents performing unauthorized or incorrect tests and supports coordinated, safe care.
- Which documentation practice supports both accuracy and legal defensibility in the medical record?
- Using vague entries with no times
- Charting tests that were not performed
- Sharing one login among all technicians
- Recording data promptly, factually, and attributing it to the correct patient
Correct answer: Recording data promptly, factually, and attributing it to the correct patient
Recording data promptly, factually, and attributing it to the correct patient supports accuracy and legal defensibility. Timely, factual, properly attributed documentation creates a reliable record and protects both the patient and the technician.
- A 6-month-old infant is brought in for an EKG, and the parent asks what a normal heart rate is for the baby. The most accurate technician response is that infants:
- Normally have faster heart rates than adults, often above 100 beats per minute
- Normally have slower heart rates than adults
- Do not have a measurable heart rate until age one
- Have the same heart rate as adults
Correct answer: Normally have faster heart rates than adults, often above 100 beats per minute
Explaining that infants normally have faster heart rates than adults, often above 100 beats per minute, is accurate. Heart rate is highest in infancy and decreases with age, so infant norms greatly exceed adult resting rates.
- An EKG technician notices a colleague leaving a logged-in EHR session unattended on a public terminal. The best response is to:
- Ignore it as someone else's problem
- Use the open session to chart faster
- Log the colleague out and remind the team about session security
- Post a note asking others not to peek
Correct answer: Log the colleague out and remind the team about session security
Logging the colleague out and reminding the team about session security is the best response. Protecting unattended sessions safeguards PHI from unauthorized access and reinforces a culture of confidentiality.
- During an exercise stress test, the patient reports severe dizziness and the EKG shows a concerning change. The technician's coordinated-care responsibility is to:
- Notify the supervising clinician promptly so the test can be evaluated or stopped
- Continue silently and finish the protocol
- Diagnose the cause for the patient
- Encourage the patient to push harder
Correct answer: Notify the supervising clinician promptly so the test can be evaluated or stopped
Notifying the supervising clinician promptly so the test can be evaluated or stopped is the technician's responsibility. Severe symptoms with EKG changes may require halting the test, and the licensed clinician must make that decision.
- Which is the most appropriate way to maintain patient safety when an unstable patient must be left briefly during testing?
- Ensure a qualified staff member monitors the patient and use the call system
- Disconnect the monitor to reduce alarms
- Lock the door so the patient cannot leave
- Leave the patient alone without informing anyone
Correct answer: Ensure a qualified staff member monitors the patient and use the call system
Ensuring a qualified staff member monitors the patient and using the call system is most appropriate. Continuous oversight of an unstable patient and accessible help maintain safety and align with coordinated care responsibilities.
- A patient refuses an EKG after the procedure is explained. The technician should:
- Respect the patient's right to refuse and notify the appropriate clinician
- Argue with the patient until they agree
- Document that the test was completed
- Perform the EKG anyway since it was ordered
Correct answer: Respect the patient's right to refuse and notify the appropriate clinician
Respecting the patient's right to refuse and notifying the appropriate clinician is correct. Patients have the right to decline procedures, and the technician must honor that choice while informing the care team for follow-up.
- Which action best reflects a technician practicing within scope while supporting a patient experiencing anxiety before testing?
- Prescribing an anti-anxiety medication
- Calmly explaining the painless procedure and answering questions within scope
- Performing a diagnosis to reassure them
- Telling the patient the results in advance
Correct answer: Calmly explaining the painless procedure and answering questions within scope
Calmly explaining the painless procedure and answering questions within scope best supports an anxious patient. Reassurance and education are appropriate technician roles, whereas prescribing and diagnosing are not.
- What is the appropriate technician response if EKG equipment appears damaged or unsafe?
- Repair the internal electronics personally
- Remove it from service and report the problem before using it on patients
- Hide the damage from the supervisor
- Use it anyway to avoid delays
Correct answer: Remove it from service and report the problem before using it on patients
Removing damaged equipment from service and reporting the problem before using it is appropriate. Using unsafe equipment risks patient harm and inaccurate results, so reporting and replacing it upholds safety responsibilities.
- A patient being fitted with a Holter monitor asks how long to wear it. The technician explains that a typical Holter recording lasts:
- About 5 minutes
- About 24 to 48 hours of continuous recording
- Exactly one week with patient activation only
- Less than one hour
Correct answer: About 24 to 48 hours of continuous recording
Explaining that a typical Holter recording lasts about 24 to 48 hours of continuous recording is correct. This timeframe captures the patient's rhythm across a full day of normal activity to detect intermittent abnormalities.
- Which statement about a patient's right to confidentiality is correct?
- Patient information must be safeguarded by all staff who access it
- Confidentiality applies only to electronic records
- Only physicians are required to protect patient privacy
- Confidentiality ends once the EKG is printed
Correct answer: Patient information must be safeguarded by all staff who access it
The statement that patient information must be safeguarded by all staff who access it is correct. Every member of the care team, including EKG technicians, is responsible for protecting PHI in any form, at all times.
- A patient who fainted during testing regains consciousness but remains pale and weak. The coordinated-care priority for the technician is to:
- Keep the patient safe, monitor them, and report the syncopal event to clinical staff
- Tell the patient it was nothing to worry about
- Send the patient home immediately
- Resume testing right away without notifying anyone
Correct answer: Keep the patient safe, monitor them, and report the syncopal event to clinical staff
Keeping the patient safe, monitoring them, and reporting the syncopal event to clinical staff is the priority. A syncopal episode can signal an underlying cardiac problem, so continued observation and prompt reporting protect the patient.
- When placing the V1 electrode for a standard 12-lead EKG, the correct anatomical location is the:
- Second intercostal space at the left sternal border
- Fourth intercostal space at the right sternal border
- Fifth intercostal space at the midclavicular line
- Fourth intercostal space at the left sternal border
Correct answer: Fourth intercostal space at the right sternal border
The V1 electrode belongs at the fourth intercostal space at the right sternal border. This landmark sits just to the right of the breastbone in the fourth rib interspace, and accurate placement here is essential because V1 anchors the position of the remaining chest leads.
- Which electrode is correctly placed at the fourth intercostal space at the left sternal border?
Correct answer: V2
The V2 electrode is placed at the fourth intercostal space at the left sternal border. It sits directly across the sternum from V1, so the two leads occupy the same rib interspace on opposite sides of the breastbone.
- On a standard 12-lead EKG, the V4 electrode is positioned at the:
- Anterior axillary line level with V4
- Right sternal border in the fourth intercostal space
- Fifth intercostal space at the midclavicular line
- Midaxillary line in the fifth intercostal space
Correct answer: Fifth intercostal space at the midclavicular line
The V4 electrode is positioned at the fifth intercostal space at the midclavicular line. V4 is placed before V3, and V3 is then located midway between V2 and V4, so establishing V4 correctly is a key reference step.
- The V3 electrode on a 12-lead EKG should be placed:
- At the midaxillary line
- Midway between the locations of V2 and V4
- Directly over the sternum
- At the right midclavicular line
Correct answer: Midway between the locations of V2 and V4
The V3 electrode is placed midway between the locations of V2 and V4. Because V3 is defined by the positions of its neighbors, technicians establish V2 and V4 first and then split the distance to find V3.
- Which precordial electrode is placed at the fifth intercostal space at the anterior axillary line?
Correct answer: V5
The V5 electrode is placed at the fifth intercostal space at the anterior axillary line. V5 lies on the same horizontal level as V4, continuing the line of chest leads laterally across the left side of the chest.
- The V6 electrode for a 12-lead EKG is correctly located at the:
- Midclavicular line in the fifth intercostal space
- Posterior axillary line
- Second intercostal space at the right sternal border
- Fifth intercostal space at the midaxillary line
Correct answer: Fifth intercostal space at the midaxillary line
The V6 electrode is located at the fifth intercostal space at the midaxillary line. V6, V5, and V4 all sit at the same horizontal level, with V6 being the most lateral of the chest leads.
- A technician is locating the fourth intercostal space to place V1 and V2. The bony landmark most commonly used to count down to the correct interspace is the:
- Xiphoid process
- Angle of Louis (sternal angle), which marks the second rib
- Suprasternal notch only
- Acromion process
Correct answer: Angle of Louis (sternal angle), which marks the second rib
The angle of Louis, also called the sternal angle, marks the level of the second rib and is the standard landmark for counting interspaces. Finding this ridge lets the technician identify the second intercostal space and count down to the fourth for V1 and V2.
- Why is correctly identifying the angle of Louis important during 12-lead electrode placement?
- It provides the reference point for counting down to the fourth intercostal space
- It determines the paper speed setting
- It marks where the left arm electrode is applied
- It sets the calibration voltage
Correct answer: It provides the reference point for counting down to the fourth intercostal space
The angle of Louis provides the reference point for counting down to the fourth intercostal space. Because it reliably overlies the second rib, technicians use it to count interspaces accurately so V1 and V2 land in the correct location.
- A standard 12-lead EKG uses how many electrodes placed on the patient?
- Twelve electrodes
- Six electrodes
- Fifteen electrodes
- Ten electrodes
Correct answer: Ten electrodes
A standard 12-lead EKG uses ten electrodes. Six precordial electrodes (V1 through V6) plus four limb electrodes combine to produce the twelve different views, or leads, that make up the tracing.
- On a 12-lead EKG, the six chest leads (V1 through V6) primarily view the heart in which plane?
- The horizontal (transverse) plane
- The sagittal plane only
- The frontal plane
- No specific plane
Correct answer: The horizontal (transverse) plane
The six chest leads view the heart in the horizontal, or transverse, plane. The precordial leads wrap around the chest to look at the heart from front to side, while the limb leads provide the frontal-plane views.
- A technician about to record a 12-lead EKG should confirm that the precordial electrodes follow which placement order to avoid errors?
- V6, V5, V4, V3, V2, V1 from lateral to medial
- Random placement as long as all six are on the chest
- V1 and V2 at the fourth intercostal space, then V4, V3, V5, V6 by landmark
- All six in a straight vertical line down the sternum
Correct answer: V1 and V2 at the fourth intercostal space, then V4, V3, V5, V6 by landmark
Correct placement establishes V1 and V2 at the fourth intercostal space, then locates V4, places V3 between V2 and V4, and finishes with V5 and V6. Following this landmark-based order rather than a straight line ensures each lead views the intended region of the heart.
- Misplacing chest electrodes too high or in the wrong interspace on a 12-lead EKG can MOST directly cause:
- A change in the paper speed
- Loss of all limb lead tracings
- Altered R-wave progression that may mimic or mask pathology
- The machine to switch to telemetry mode
Correct answer: Altered R-wave progression that may mimic or mask pathology
Misplaced chest electrodes can produce altered R-wave progression that may mimic or mask pathology. Because each precordial lead is meant to view a specific area of the heart, incorrect positions distort the waveforms and can lead to misinterpretation.
- Using the standard American Heart Association color code, which color is assigned to the right arm limb electrode?
Correct answer: White
Under the standard American color code, the right arm electrode is white. A common memory aid pairs 'white on the right' for the right arm and 'smoke (black) over fire (red)' for the left arm over the left leg.
- In the standard American limb-lead color code, the left leg electrode is identified by which color?
Correct answer: Red
The left leg electrode is red in the standard American color code. The memory aid 'smoke over fire' places black (left arm) over red (left leg), helping the technician recall this pairing.
- Which limb electrode functions as the ground (neutral) electrode and is typically green in the American color code?
- The right leg electrode
- The left arm electrode
- The left leg electrode
- The right arm electrode
Correct answer: The right leg electrode
The right leg electrode functions as the ground or neutral electrode and is green in the American color code. It does not contribute to the recorded leads directly but reduces electrical interference and stabilizes the tracing.
- A technician applies the limb electrodes to a patient. The most appropriate placement for the arm electrodes is:
- On the fingertips
- On the fleshy part of the lower arms or wrists, avoiding bony prominences
- Directly over the elbow bone
- On the upper chest near the shoulders
Correct answer: On the fleshy part of the lower arms or wrists, avoiding bony prominences
The arm electrodes are best placed on the fleshy part of the lower arms or wrists while avoiding bony prominences. Placement on muscle rather than bone improves contact, reduces artifact, and yields a cleaner tracing.
- If the right arm and left arm electrodes are accidentally reversed on a 12-lead EKG, the most likely result is:
- No tracing at all
- A faster paper speed
- An inverted P wave and QRS in lead I, resembling an abnormal pattern
- A larger calibration mark
Correct answer: An inverted P wave and QRS in lead I, resembling an abnormal pattern
Reversing the arm electrodes typically produces an inverted P wave and QRS in lead I, resembling an abnormal pattern. Recognizing this limb-lead reversal artifact lets the technician correct the electrodes and re-record rather than mislabel a normal heart.
- The standard paper speed for recording a routine 12-lead EKG is:
- 25 mm per second
- 50 mm per second
- 10 mm per second
- 5 mm per second
Correct answer: 25 mm per second
The standard paper speed for a routine EKG is 25 millimeters per second. At this speed each small box represents 0.04 seconds, which is the basis for measuring intervals and rates accurately.
- If an EKG is accidentally recorded at 50 mm per second instead of the standard speed, the complexes will appear:
- Identical to a normal recording
- Completely flat
- Wider and more spread out, which can be mistaken for prolonged intervals
- Narrower and compressed together
Correct answer: Wider and more spread out, which can be mistaken for prolonged intervals
At 50 millimeters per second, the complexes appear wider and more spread out, which can be mistaken for prolonged intervals. Doubling the paper speed stretches the waveforms horizontally, so the technician must note the speed to avoid misreading the timing.
- The standard gain (sensitivity) setting on an EKG machine produces a calibration deflection of:
- 10 mm tall for 1 mV
- 5 mm tall for 1 mV
- 20 mm tall for 1 mV
- 1 mm tall for 1 mV
Correct answer: 10 mm tall for 1 mV
At standard gain, a 1 millivolt signal produces a deflection 10 millimeters tall. This calibration relationship lets clinicians judge the true amplitude, or voltage, of the waveforms on the tracing.
- The standardization (calibration) mark printed at the start of an EKG tracing normally appears as a rectangular pulse that is:
- 5 mm tall, representing 2 millivolts
- 25 mm tall, representing 1 millivolt
- 10 mm tall, representing 1 millivolt
- 2 mm tall, representing 0.5 millivolt
Correct answer: 10 mm tall, representing 1 millivolt
The standardization mark normally appears 10 millimeters tall, representing 1 millivolt. This box confirms the machine is calibrated correctly so that amplitudes on the tracing can be trusted.
- A technician notices the QRS complexes are so tall they overlap adjacent leads. To keep the tracing readable, the appropriate adjustment is to:
- Increase the paper speed to 50 mm per second
- Reduce the gain to half standard (5 mm = 1 mV) and note the change
- Turn off the calibration mark
- Remove the limb electrodes
Correct answer: Reduce the gain to half standard (5 mm = 1 mV) and note the change
Reducing the gain to half standard, where 5 millimeters equals 1 millivolt, and noting the change keeps very tall complexes on the page. Documenting the altered sensitivity is essential so the reader knows the displayed amplitude is halved.
- When the calibration mark on an EKG measures only 5 mm instead of 10 mm and the gain switch was not intentionally changed, the technician should suspect:
- The machine sensitivity is set incorrectly and should be corrected
- The patient is having a heart attack
- The paper speed is too slow
- The limb leads are reversed
Correct answer: The machine sensitivity is set incorrectly and should be corrected
A 5 millimeter calibration mark when half-standard gain was not selected suggests the machine sensitivity is set incorrectly and should be corrected. Verifying the calibration pulse before interpreting protects against misjudging waveform amplitudes.
- Before applying electrodes, why is proper skin preparation important for obtaining a quality EKG?
- It speeds up the heart rate
- It improves electrode contact and reduces artifact
- It is required by HIPAA
- It changes the calibration voltage
Correct answer: It improves electrode contact and reduces artifact
Proper skin preparation improves electrode contact and reduces artifact. Removing oils, lotion, dead skin, and excess hair lowers the resistance between skin and electrode, producing a cleaner, more accurate tracing.
- A patient has a very hairy chest where the V leads must be placed. The most appropriate skin-preparation step is to:
- Apply the electrodes directly over the hair
- Use extra conduction gel only
- Skip the chest leads entirely
- Clip or shave the hair at the electrode sites
Correct answer: Clip or shave the hair at the electrode sites
Clipping or shaving the hair at the electrode sites is the appropriate step for a hairy chest. Hair prevents the electrode from making firm contact with the skin, so removing it at each site ensures good adhesion and signal quality.
- If a patient's skin is oily or covered in lotion at an electrode site, the technician should:
- Cleanse the area with alcohol or soap and water and allow it to dry
- Apply the electrode anyway to save time
- Add more lotion for better conduction
- Increase the machine gain to compensate
Correct answer: Cleanse the area with alcohol or soap and water and allow it to dry
Cleansing the area with alcohol or soap and water and allowing it to dry is correct for oily or lotioned skin. Oils and lotions interfere with electrode adhesion and conduction, so removing them before applying the electrode prevents artifact.
- Lightly abrading the skin with a dry gauze or preparation pad before electrode placement primarily helps by:
- Warming the patient
- Removing dead skin cells to lower skin resistance
- Sterilizing the entire chest
- Reducing the heart rate
Correct answer: Removing dead skin cells to lower skin resistance
Light abrasion removes dead skin cells to lower skin resistance. The outer layer of dead skin acts as a barrier to the electrical signal, so gentle abrasion improves conduction and reduces baseline noise.
- A patient has a below-the-knee amputation of the left leg. The most appropriate way to place the left leg limb electrode is to:
- Omit the left leg electrode entirely
- Place it on the right leg instead
- Place it on the remaining portion of the limb or the lower left torso
- Place it on the left arm
Correct answer: Place it on the remaining portion of the limb or the lower left torso
For a leg amputation, the electrode is placed on the remaining portion of the limb or the lower left torso. Keeping the electrode on the same side as the missing limb preserves the orientation of the tracing while accommodating the patient's anatomy.
- A patient in late-term pregnancy becomes short of breath and dizzy when lying flat for an EKG. The best technician response is to:
- Insist the patient remain completely flat
- Cancel the EKG permanently
- Place the patient prone (face down)
- Position the patient in a left lateral tilt or semi-upright position for comfort and safety
Correct answer: Position the patient in a left lateral tilt or semi-upright position for comfort and safety
Positioning the patient in a left lateral tilt or semi-upright position is best for a late-term pregnant patient who feels faint lying flat. The gravid uterus can compress the vena cava when supine, so adjusting the position relieves the symptoms while still allowing the recording.
- A patient with severe respiratory distress cannot lie flat for an EKG. The technician should:
- Force the patient to lie completely supine
- Refuse to perform the test
- Allow a semi-Fowler (semi-upright) position and document the position used
- Have the patient stand for the entire recording
Correct answer: Allow a semi-Fowler (semi-upright) position and document the position used
Allowing a semi-Fowler position and documenting the position used is appropriate for a patient in respiratory distress. Elevating the head of the bed eases breathing, and noting the non-standard position helps the reader account for any positional effect on the tracing.
- When an arm electrode cannot be placed on a limb due to amputation, an acceptable alternative is to position it on the:
- Opposite arm
- Forehead
- Lower abdomen
- Shoulder or upper torso on the same side
Correct answer: Shoulder or upper torso on the same side
When an arm cannot be used, the electrode is placed on the shoulder or upper torso on the same side. Keeping it on the corresponding side maintains the correct directional relationship for the limb leads.
- When a right-sided 12-lead EKG is ordered, the chest electrodes are placed:
- In mirror-image positions on the right side of the chest
- In the standard positions on the left chest
- All on the back
- On the limbs only
Correct answer: In mirror-image positions on the right side of the chest
For a right-sided EKG, the chest electrodes are placed in mirror-image positions on the right side of the chest. This configuration, often labeled V1R through V6R, helps evaluate the right ventricle, which the standard left-sided leads view poorly.
- Posterior leads V7, V8, and V9 are placed:
- On the right arm
- On the lower legs
- Across the patient's back at the level of V6
- Over the sternum
Correct answer: Across the patient's back at the level of V6
Posterior leads V7, V8, and V9 are placed across the patient's back at the same horizontal level as V6. These additional leads improve detection of changes on the back wall of the heart that standard leads may miss.
- On a pediatric patient, a commonly used modified lead is V4R, which is placed:
- On the left shoulder
- At the fifth intercostal space, right midclavicular line (mirror of V4)
- At the standard V4 position on the left
- Over the umbilicus
Correct answer: At the fifth intercostal space, right midclavicular line (mirror of V4)
V4R is placed at the fifth intercostal space at the right midclavicular line, mirroring the standard V4 position. This right-sided lead is frequently used in children because their relatively larger right ventricle is better assessed from the right chest.
- When obtaining a right-sided EKG, the technician should clearly label the tracing to indicate right-sided placement because:
- It changes the patient's heart rate
- Without the label, the reader could mistake the unusual pattern for an error or pathology
- It is required for billing only
- The paper speed must be doubled
Correct answer: Without the label, the reader could mistake the unusual pattern for an error or pathology
Right-sided tracings must be clearly labeled because without the label the reader could mistake the unusual pattern for an error or pathology. Marking the leads as right-sided tells the interpreter to evaluate the tracing with the modified placement in mind.
- The natural pacemaker of the heart, which normally initiates each heartbeat, is the:
- Atrioventricular node
- Bundle of His
- Sinoatrial node
- Purkinje fibers
Correct answer: Sinoatrial node
The sinoatrial node is the natural pacemaker that normally initiates each heartbeat. Located in the right atrium, it sets the heart rate, and understanding its role helps the technician appreciate where the normal impulse originates.
- On a standard EKG, electrical activity normally spreads through the heart in which sequence?
- Atria first, then ventricles
- Ventricles first, then atria
- Both chambers at exactly the same time
- Only the left side of the heart
Correct answer: Atria first, then ventricles
Electrical activity normally spreads through the atria first and then the ventricles. This top-to-bottom sequence produces the P wave (atrial activity) before the QRS complex (ventricular activity) on the tracing.
- The lower two chambers of the heart, which pump blood to the lungs and body, are the:
- Ventricles
- Atria
- Valves
- Septa
Correct answer: Ventricles
The lower two chambers are the ventricles. The right ventricle pumps blood to the lungs and the left ventricle pumps blood to the body, and their contraction corresponds to the QRS complex on the EKG.
- A 3-lead EKG used for continuous bedside monitoring differs from a 12-lead EKG in that it:
- Uses fewer electrodes and is used mainly for rhythm monitoring rather than full diagnosis
- Provides a more detailed diagnostic view of all heart regions
- Requires a radioactive tracer
- Cannot detect heart rate
Correct answer: Uses fewer electrodes and is used mainly for rhythm monitoring rather than full diagnosis
A 3-lead EKG uses fewer electrodes and is used mainly for rhythm monitoring rather than full diagnosis. It tracks the heart's rhythm continuously but lacks the multiple views needed for the detailed interpretation a 12-lead provides.
- Which acquisition method continuously records a patient's rhythm and wirelessly transmits it to a central monitoring station within the facility?
- A single resting 12-lead EKG
- A nuclear stress test
- A one-time rhythm strip
- Telemetry monitoring
Correct answer: Telemetry monitoring
Telemetry monitoring continuously records the patient's rhythm and wirelessly transmits it to a central monitoring station. This lets staff watch hospitalized patients for arrhythmias while the patients move about the unit.
- A key difference between stationary (hardwired) and ambulatory telemetry is that ambulatory telemetry:
- Cannot record any rhythm
- Requires a 12-lead every minute
- Uses no electrodes
- Allows the patient to move around while a portable transmitter sends the signal
Correct answer: Allows the patient to move around while a portable transmitter sends the signal
Ambulatory telemetry allows the patient to move around while a portable transmitter sends the signal to the monitoring station. Stationary monitoring, by contrast, ties the patient to a bedside unit by a cable.
- A 5-lead monitoring system is often chosen over a 3-lead system because it:
- Allows monitoring of more lead views, including a precordial lead, for better arrhythmia and ST-segment surveillance
- Requires no electrodes on the chest
- Doubles the paper speed automatically
- Eliminates the need for skin preparation
Correct answer: Allows monitoring of more lead views, including a precordial lead, for better arrhythmia and ST-segment surveillance
A 5-lead system allows monitoring of more lead views, including a precordial lead, for better arrhythmia and ST-segment surveillance. The additional electrode provides more diagnostic information than a basic 3-lead setup while still being used for monitoring.
- When applying a Holter monitor, the technician typically places the electrodes:
- On the torso over bony areas to minimize muscle artifact during movement
- On the arms and legs like a routine 12-lead
- On the scalp
- On the fingertips
Correct answer: On the torso over bony areas to minimize muscle artifact during movement
Holter electrodes are typically placed on the torso over bony areas to minimize muscle artifact during movement. Because the patient wears the device during daily activity, placement over bone rather than muscle reduces motion-related noise in the recording.
- Thorough skin preparation is especially important when applying a Holter monitor because:
- The device records for only a few seconds
- It eliminates the need for the patient to log symptoms
- It changes the gain setting
- The patient wears it for an extended period during activity, so secure, low-artifact contact is critical
Correct answer: The patient wears it for an extended period during activity, so secure, low-artifact contact is critical
Thorough skin preparation matters for a Holter because the patient wears it for an extended period during activity, so secure, low-artifact contact is critical. Good preparation keeps the electrodes adhered and the signal clean across many hours of movement.
- After applying a Holter monitor and before the patient leaves, the technician should verify that:
- The patient has memorized the rhythm interpretation
- The patient will not move for 24 hours
- The machine is set to 50 mm per second
- The electrodes are secure, the leads are connected, and the device is recording
Correct answer: The electrodes are secure, the leads are connected, and the device is recording
Before the patient leaves, the technician should verify that the electrodes are secure, the leads are connected, and the device is recording. Confirming a good setup at the start prevents lost data over the long recording period.
- After completing a 12-lead EKG, the technician should verify that the tracing includes:
- All twelve leads, a calibration mark, and clearly readable waveforms
- Only the limb leads
- Just the rhythm strip
- Only leads V1 through V6
Correct answer: All twelve leads, a calibration mark, and clearly readable waveforms
A complete tracing should include all twelve leads, a calibration mark, and clearly readable waveforms. Verifying these elements before releasing the EKG ensures the recording is usable for interpretation and not missing data.
- A technician notices that lead III is blank on a printed 12-lead EKG. The most appropriate action is to:
- Release the tracing as complete
- Increase the paper speed
- Check the corresponding electrode and lead-wire connection and re-record
- Tell the patient to hold their breath longer
Correct answer: Check the corresponding electrode and lead-wire connection and re-record
A blank lead III calls for checking the corresponding electrode and lead-wire connection and re-recording. A missing lead usually reflects a loose or disconnected electrode, so correcting the connection restores the complete tracing.
- Which element confirms that an EKG machine recorded the waveform amplitudes at standard sensitivity?
- The 10 mm by standard-width calibration pulse on the tracing
- The patient's name in the corner
- The time of day printed at the top
- The hospital logo
Correct answer: The 10 mm by standard-width calibration pulse on the tracing
The 10 millimeter calibration pulse confirms the machine recorded at standard sensitivity. Including this standardization mark on every tracing lets the reader trust that the displayed amplitudes are accurate.
- A wandering (drifting) baseline on an EKG, where the tracing slowly moves up and down across the page, is most commonly caused by:
- Electrical interference from nearby equipment
- Patient movement, respiration, or loose or dried-out electrodes
- The paper speed being set too high
- A normal heart rhythm
Correct answer: Patient movement, respiration, or loose or dried-out electrodes
A wandering baseline is most commonly caused by patient movement, respiration, or loose or dried-out electrodes. These factors cause the baseline to drift slowly, and improving electrode contact or reducing movement usually resolves it.
- The best first step to correct a wandering baseline artifact is to:
- Increase the machine gain
- Switch the paper speed to 50 mm per second
- Check and resecure the electrodes, ensuring good skin contact
- Reverse the limb leads
Correct answer: Check and resecure the electrodes, ensuring good skin contact
The best first step is to check and resecure the electrodes, ensuring good skin contact. Because loose or poorly adhered electrodes commonly cause baseline drift, improving the contact often eliminates the wandering pattern.
- A rapid, fuzzy, irregular fluctuation of the baseline that varies with a patient's voluntary or involuntary muscle activity is known as:
- Wandering baseline
- AC interference
- A calibration pulse
- Somatic tremor (muscle) artifact
Correct answer: Somatic tremor (muscle) artifact
This rapid, fuzzy, irregular fluctuation is somatic tremor, or muscle, artifact. It arises from skeletal muscle activity such as shivering, tension, or movement disorders, and is distinct from the smooth drift of a wandering baseline.
- A cold, anxious patient is shivering, producing irregular muscle artifact on the tracing. The most appropriate corrective action is to:
- Increase the paper speed
- Disconnect the ground electrode
- Help the patient relax and warm up, then re-record once the shivering stops
- Apply more electrodes to the same sites
Correct answer: Help the patient relax and warm up, then re-record once the shivering stops
Helping the patient relax and warm up, then re-recording once the shivering stops, best corrects muscle artifact. Because somatic tremor comes from muscle activity, reducing shivering and tension at the source clears the fuzzy baseline.
- Sixty-cycle (AC) interference on an EKG appears as:
- A slow, smooth drift of the baseline
- A completely flat line
- Random large irregular waves
- A uniform, fine, regular series of spikes at 60 cycles per second across the tracing
Correct answer: A uniform, fine, regular series of spikes at 60 cycles per second across the tracing
Sixty-cycle interference appears as a uniform, fine, regular series of spikes at 60 cycles per second across the tracing. This consistent, high-frequency pattern reflects interference from the surrounding alternating-current electrical environment.
- The most likely source of 60-cycle (AC) interference on an EKG tracing is:
- The patient's heartbeat
- The standard paper speed
- Nearby electrical equipment, power cords, or improper grounding
- Patient respiration
Correct answer: Nearby electrical equipment, power cords, or improper grounding
Sixty-cycle interference most likely comes from nearby electrical equipment, power cords, or improper grounding. The alternating current that powers these devices induces the uniform 60-hertz pattern, so addressing the electrical environment usually resolves it.
- To reduce 60-cycle (AC) interference on an EKG, the technician should:
- Ask the patient to take deep breaths
- Increase the machine gain to override the noise
- Move or unplug nearby electrical devices and verify the patient is properly grounded
- Reverse the chest electrodes
Correct answer: Move or unplug nearby electrical devices and verify the patient is properly grounded
Moving or unplugging nearby electrical devices and verifying the patient is properly grounded reduces AC interference. Eliminating the source of the surrounding alternating current and ensuring good grounding clears the uniform 60-hertz spikes.
- Which artifact is characterized by a thick, fuzzy line caused by interference from the surrounding electrical power supply rather than the patient?
- Wandering baseline
- Somatic tremor
- Normal sinus rhythm
- AC (60-cycle) interference
Correct answer: AC (60-cycle) interference
AC, or 60-cycle, interference produces a thick, fuzzy line caused by the surrounding electrical power supply. Unlike movement-related artifacts, it originates from the electrical environment, so correcting it focuses on electrical sources and grounding.
- An EKG shows artifact only in lead II and the leads that share the left leg electrode, while other leads are clean. This pattern most strongly suggests:
- A problem with the left leg electrode or its connection
- A heart attack
- The paper speed is wrong
- AC interference from the whole room
Correct answer: A problem with the left leg electrode or its connection
Artifact limited to the leads sharing one electrode points to a problem with that electrode, in this case the left leg electrode or its connection. Identifying which leads are affected helps the technician isolate and fix the single faulty electrode.
- When mounting a 12-lead EKG tracing for the patient's chart, the technician should ensure that:
- The leads are arranged randomly
- Only the rhythm strip is kept
- The leads are labeled correctly and the calibration mark is visible
- The patient identifiers are removed
Correct answer: The leads are labeled correctly and the calibration mark is visible
When mounting a tracing, the technician should ensure the leads are labeled correctly and the calibration mark is visible. Proper, labeled mounting with intact identifiers and calibration allows accurate interpretation and a complete medical record.
- Why must patient identifiers and the date and time remain on a mounted EKG tracing?
- To ensure the tracing is correctly attributed to the right patient and encounter
- To set the machine gain
- To change the heart rate
- To remove the calibration mark
Correct answer: To ensure the tracing is correctly attributed to the right patient and encounter
Identifiers and the date and time must remain to ensure the tracing is correctly attributed to the right patient and encounter. Without them, the recording cannot be reliably matched to the patient, risking documentation errors.
- During a treadmill stress test, the technician continuously monitors the EKG primarily to:
- Measure the patient's temperature
- Set the paper speed
- Detect ischemic changes or arrhythmias that develop with exertion
- Record the patient's weight
Correct answer: Detect ischemic changes or arrhythmias that develop with exertion
Continuous EKG monitoring during a stress test is done primarily to detect ischemic changes or arrhythmias that develop with exertion. Watching the tracing as the workload increases allows the team to identify abnormal responses promptly.
- While monitoring a patient during exercise stress testing, the technician observes a run of multiple premature ventricular beats and the patient reports chest tightness. The technician should:
- Continue the test without comment
- Diagnose the arrhythmia for the chart
- Promptly alert the supervising clinician about the rhythm change and symptoms
- Increase the treadmill speed
Correct answer: Promptly alert the supervising clinician about the rhythm change and symptoms
The technician should promptly alert the supervising clinician about the rhythm change and symptoms. New ventricular ectopy with chest tightness during exertion can signal an adverse reaction, and the clinician decides whether to stop the test.
- Which EKG change observed during stress testing should be reported immediately as a potential adverse reaction?
- A gradual, expected rise in heart rate with exercise
- A normal calibration mark
- Significant ST-segment depression developing with exertion
- A steady regular rhythm
Correct answer: Significant ST-segment depression developing with exertion
Significant ST-segment depression developing with exertion should be reported immediately as a potential adverse reaction. This change can indicate exercise-induced ischemia, so the supervising clinician must be informed to evaluate stopping the test.
- Part of routine EKG equipment maintenance includes ensuring that:
- The recording paper is loaded and adequate for the next tracing
- The patient's diagnosis is entered
- The room temperature is exactly 70 degrees
- The calibration mark is removed
Correct answer: The recording paper is loaded and adequate for the next tracing
Routine maintenance includes ensuring the recording paper is loaded and adequate for the next tracing. Running out of paper mid-recording can produce an incomplete EKG, so checking and refilling supplies keeps the machine ready.
- A reusable limb-lead clip electrode has become corroded and produces poor tracings. The appropriate maintenance action is to:
- Keep using it to avoid downtime
- Clean or replace the clip so it makes proper electrical contact
- Increase the gain to compensate
- Apply it to a different limb
Correct answer: Clean or replace the clip so it makes proper electrical contact
The appropriate action is to clean or replace the corroded clip so it makes proper electrical contact. A degraded electrode raises resistance and introduces artifact, so maintaining or swapping it restores tracing quality.
- Reusable EKG lead wires and clips that contact patients should be:
- Never cleaned to preserve sensitivity
- Disinfected between patients according to facility policy
- Rinsed with plain water once a month
- Replaced after every single patient
Correct answer: Disinfected between patients according to facility policy
Reusable lead wires and clips should be disinfected between patients according to facility policy. Routine disinfection of items that touch patients controls infection and is part of proper equipment maintenance.
- Before recording, why does the technician confirm that the EKG cable and lead wires are intact and free of cracks?
- It changes the patient's heart rate
- Cracked or damaged wires can introduce artifact or fail to transmit the signal
- It is needed to set the calibration to 5 mm
- It speeds up the paper to 50 mm per second
Correct answer: Cracked or damaged wires can introduce artifact or fail to transmit the signal
Damaged wires are checked because cracked or broken cables can introduce artifact or fail to transmit the signal. Inspecting the cabling as part of maintenance prevents recording failures and poor-quality tracings.
- For a routine resting 12-lead EKG, the standard patient position is:
- Supine (lying flat on the back) with arms at the sides
- Standing upright
- Lying face down
- Sitting and leaning forward
Correct answer: Supine (lying flat on the back) with arms at the sides
The standard position for a resting 12-lead EKG is supine with the arms at the sides. Lying flat and relaxed minimizes muscle tension and movement, helping produce a clean, artifact-free tracing.
- A technician should instruct a patient during the EKG recording to:
- Talk continuously to stay calm
- Hold the breath for the entire tracing
- Cross the legs tightly
- Lie still, relax, and breathe normally without talking
Correct answer: Lie still, relax, and breathe normally without talking
The patient should be instructed to lie still, relax, and breathe normally without talking. Stillness and relaxed muscles reduce somatic tremor and baseline wander, improving the quality of the recording.
- When 60-cycle interference cannot be cleared by checking the patient and electrodes, an additional troubleshooting step is to:
- Increase the paper speed to 50 mm per second
- Ensure the machine and patient are away from unshielded electrical sources and that grounding is intact
- Remove the calibration mark
- Place all electrodes on one limb
Correct answer: Ensure the machine and patient are away from unshielded electrical sources and that grounding is intact
An additional step is to ensure the machine and patient are away from unshielded electrical sources and that grounding is intact. Because AC interference comes from the electrical environment, optimizing distance and grounding addresses the underlying cause.
- A technician finds that the EKG printout shows muscle artifact strongest in the limb leads while a patient grips the bed rails tightly. The best corrective action is to:
- Increase the machine gain
- Switch to right-sided leads
- Remove the chest electrodes
- Ask the patient to relax the arms and rest them comfortably, then re-record
Correct answer: Ask the patient to relax the arms and rest them comfortably, then re-record
Asking the patient to relax the arms and rest them comfortably, then re-recording, best corrects this artifact. Tense muscles in the limbs generate somatic tremor, so relaxing them at the source clears the limb-lead noise.
- Which statement about the limb electrodes on a standard 12-lead EKG is correct?
- They are placed on all four limbs: right arm, left arm, right leg, and left leg
- They are placed only on the two arms
- They are placed on the chest
- Only one limb electrode is needed
Correct answer: They are placed on all four limbs: right arm, left arm, right leg, and left leg
The limb electrodes are placed on all four limbs: right arm, left arm, right leg, and left leg. These four electrodes generate the limb and augmented limb leads that view the heart in the frontal plane.
- If a technician reverses the left arm and left leg electrodes, the resulting tracing will:
- Show altered limb-lead patterns that can be mistaken for abnormality
- Be completely blank
- Run at double speed
- Lose the chest leads only
Correct answer: Show altered limb-lead patterns that can be mistaken for abnormality
Reversing the left arm and left leg electrodes will show altered limb-lead patterns that can be mistaken for abnormality. Recognizing electrode reversal as the cause prevents misinterpretation, and correcting the placement restores an accurate tracing.
- A patient with large breasts is having a 12-lead EKG. For accurate placement of V4 through V6, the technician should:
- Place the electrodes under the breast at the correct intercostal spaces
- Place the electrodes on top of the breast tissue
- Skip those leads
- Move them to the back
Correct answer: Place the electrodes under the breast at the correct intercostal spaces
For accurate placement on a patient with large breasts, the lateral chest electrodes are placed under the breast at the correct intercostal spaces. Positioning the electrodes on the rib spaces beneath the breast keeps them in their proper anatomical locations.
- After locating V1 and V2 at the fourth intercostal space, the technician next establishes V4 before V3 because:
- V4 must be at the second intercostal space
- V3 is defined as the midpoint between V2 and V4, so V4 is needed first
- V4 is a limb lead
- V3 is never used
Correct answer: V3 is defined as the midpoint between V2 and V4, so V4 is needed first
V4 is established before V3 because V3 is defined as the midpoint between V2 and V4, so V4 is needed first. This ordering ensures V3 lands precisely halfway between its neighbors rather than being estimated.
- A 6-second rhythm strip recorded during monitoring is most directly useful for:
- Measuring the calibration voltage
- Assessing the heart's rhythm and providing a sample for the chart
- Determining the patient's blood pressure
- Setting the gain
Correct answer: Assessing the heart's rhythm and providing a sample for the chart
A rhythm strip is most directly useful for assessing the heart's rhythm and providing a sample for the chart. The continuous single-lead recording captures the pattern of beats over time for monitoring and documentation.
- Telemetry monitoring electrodes that begin to lose contact will most likely cause:
- A change in the patient's actual heart rhythm
- The paper speed to increase
- The calibration mark to disappear from the 12-lead
- Artifact or a 'leads off' alarm at the monitoring station
Correct answer: Artifact or a 'leads off' alarm at the monitoring station
Loose telemetry electrodes will most likely cause artifact or a 'leads off' alarm at the monitoring station. Maintaining secure electrode contact prevents false alarms and ensures the patient's rhythm is reliably transmitted.
- Which step best ensures a patient on telemetry continues to transmit a clear signal throughout a shift?
- Removing the electrodes during meals
- Periodically checking electrode adhesion and replacing electrodes that loosen or dry out
- Increasing the monitor brightness
- Asking the patient to remain perfectly still all day
Correct answer: Periodically checking electrode adhesion and replacing electrodes that loosen or dry out
Periodically checking electrode adhesion and replacing electrodes that loosen or dry out best maintains a clear telemetry signal. Ongoing attention to electrode contact keeps the transmitted rhythm readable over many hours.
- When preparing the chest of a diaphoretic (sweaty) patient before electrode placement, the technician should:
- Apply electrodes over the wet skin immediately
- Add water to the site
- Increase the gain
- Dry the skin and consider a skin-prep step so electrodes adhere
Correct answer: Dry the skin and consider a skin-prep step so electrodes adhere
For a diaphoretic patient, the technician should dry the skin and consider a skin-prep step so electrodes adhere. Moisture prevents electrodes from sticking and causes baseline wander, so drying and preparing the skin improves contact.
- An infant requires a 12-lead EKG. Compared with adults, lead placement for a small child or infant may require:
- Placing all electrodes on the scalp
- Smaller electrodes and the use of right-sided or modified positions as ordered
- Doubling the number of limb leads
- Omitting all chest leads
Correct answer: Smaller electrodes and the use of right-sided or modified positions as ordered
Pediatric placement may require smaller electrodes and the use of right-sided or modified positions as ordered. Children's smaller anatomy and proportionally larger right ventricle make appropriately sized electrodes and modified leads such as V4R common.
- A complete diagnostic 12-lead EKG produces how many distinct views of the heart?
- Six views
- Ten views
- Three views
- Twelve views
Correct answer: Twelve views
A complete 12-lead EKG produces twelve distinct views of the heart. Although only ten electrodes are used, the machine combines their signals to generate twelve leads that look at the heart from different angles.
- On a properly recorded 12-lead EKG, the six limb-derived leads (I, II, III, aVR, aVL, aVF) provide views in the:
- Frontal (vertical) plane
- Horizontal plane
- Right-sided plane only
- Posterior plane only
Correct answer: Frontal (vertical) plane
The six limb-derived leads provide views in the frontal, or vertical, plane. The limb electrodes look at the heart from top to bottom and side to side, complementing the horizontal-plane views of the chest leads.
- When recording a 12-lead EKG, the technician should ask the patient to remove or reposition which items that could interfere with electrode placement or signal?
- Eyeglasses only
- Metal jewelry or clothing over the electrode sites
- The hospital wristband
- Footwear only, in every case
Correct answer: Metal jewelry or clothing over the electrode sites
The technician should have the patient remove or reposition metal jewelry or clothing over the electrode sites. Clearing the electrode areas allows proper skin contact and reduces potential interference with the recording.
- A patient's 12-lead EKG shows a fuzzy baseline only in the chest leads, while the limb leads are clean. The technician should first suspect:
- A problem affecting the chest electrodes, such as poor contact or interference at those sites
- Reversed arm electrodes
- An incorrect paper speed
- A normal finding requiring no action
Correct answer: A problem affecting the chest electrodes, such as poor contact or interference at those sites
Artifact confined to the chest leads suggests a problem affecting the chest electrodes, such as poor contact or interference at those sites. Localizing the artifact to the precordial leads tells the technician where to focus the troubleshooting.
- When mounting or storing rhythm strips, including a brief note of the lead recorded and any relevant event is helpful because it:
- Changes the heart rate
- Provides context that aids accurate interpretation of the strip
- Sets the calibration to 5 mm
- Replaces the need for patient identifiers
Correct answer: Provides context that aids accurate interpretation of the strip
Noting the lead recorded and any relevant event provides context that aids accurate interpretation of the strip. Documentation of which lead and what was happening helps the reader understand the rhythm sample correctly.
- A patient cannot lie completely flat due to back pain and is positioned semi-upright for the EKG. The technician should:
- Pretend the patient was supine in the documentation
- Refuse to perform the EKG
- Change the paper speed to compensate
- Document the actual position used so the reader can account for it
Correct answer: Document the actual position used so the reader can account for it
The technician should document the actual position used so the reader can account for it. Recording the non-standard position is honest and clinically useful, since position can subtly affect the tracing.
- Why does a 12-lead EKG combine four limb electrodes and six chest electrodes rather than using ten independent recordings?
- To make the machine slower
- To eliminate the calibration mark
- Because the machine mathematically combines the electrode signals to create twelve different lead views
- Because only chest leads matter
Correct answer: Because the machine mathematically combines the electrode signals to create twelve different lead views
The electrodes are combined because the machine mathematically combines the electrode signals to create twelve different lead views. This is why ten electrodes can yield twelve leads, each offering a unique angle on the heart's electrical activity.
- A patient with a tremor disorder produces continuous muscle artifact that obscures the QRS complexes. After helping the patient relax without improvement, the technician should:
- Report a normal tracing anyway
- Increase the paper speed to 50 mm per second to fix it
- Reverse the limb leads
- Try to obtain the best possible tracing and note the artifact for the interpreter
Correct answer: Try to obtain the best possible tracing and note the artifact for the interpreter
When relaxation does not resolve tremor artifact, the technician should obtain the best possible tracing and note the artifact for the interpreter. Documenting the unavoidable muscle artifact helps the reader distinguish it from true cardiac signals.
- The conductive gel on a disposable EKG electrode serves to:
- Improve the electrical connection between the skin and the electrode
- Speed up the heart rate
- Sterilize the chest
- Set the machine gain
Correct answer: Improve the electrical connection between the skin and the electrode
The conductive gel improves the electrical connection between the skin and the electrode. Good conduction lowers resistance and reduces artifact, which is why dried-out electrodes should be discarded and replaced.
- Before placing electrodes for a 12-lead EKG, the technician should expose the chest, wrists, and ankles primarily to:
- Cool the patient down
- Satisfy a billing requirement
- Access the correct anatomical sites for proper electrode placement
- Change the calibration
Correct answer: Access the correct anatomical sites for proper electrode placement
Exposing the chest, wrists, and ankles allows access to the correct anatomical sites for proper electrode placement. Reaching the intended landmarks for limb and chest electrodes is necessary for an accurate 12-lead recording while still respecting patient modesty with draping.
- An EKG machine displays a 'lead fault' message for the V3 channel. The most appropriate first response is to:
- Ignore it and print the tracing
- Increase the machine gain
- Reverse the limb electrodes
- Inspect the V3 electrode and lead wire for poor contact or disconnection
Correct answer: Inspect the V3 electrode and lead wire for poor contact or disconnection
The first response is to inspect the V3 electrode and lead wire for poor contact or disconnection. A lead-fault message usually means that channel has lost a good connection, so checking the electrode and wire targets the cause.
- A patient's recorded EKG shows tall, narrow spikes occurring at a perfectly regular high frequency superimposed on the whole tracing. The technician should recognize this as:
- A dangerous arrhythmia
- A normal calibration mark
- Muscle tremor only
- AC (60-cycle) electrical interference requiring environmental troubleshooting
Correct answer: AC (60-cycle) electrical interference requiring environmental troubleshooting
A perfectly regular high-frequency pattern across the whole tracing is AC, or 60-cycle, electrical interference requiring environmental troubleshooting. Its uniform, fine appearance distinguishes it from arrhythmias or irregular muscle artifact.
- Which routine check helps ensure the EKG machine is ready before bringing it to a patient?
- Verifying the patient's diagnosis
- Confirming the machine is charged or plugged in, paper is loaded, and lead wires are intact
- Setting the gain to 5 mm by default
- Removing the ground electrode
Correct answer: Confirming the machine is charged or plugged in, paper is loaded, and lead wires are intact
Confirming the machine is charged or plugged in, paper is loaded, and lead wires are intact ensures readiness. These maintenance checks prevent interruptions and equipment failures once the technician is at the bedside.
- A continuous wandering baseline persists despite resecuring the electrodes on a patient who is breathing deeply and rapidly. The technician should recognize that the drift may be due to:
- AC electrical interference
- The paper speed being too fast
- The patient's respiration moving the chest and electrodes
- A reversed limb lead
Correct answer: The patient's respiration moving the chest and electrodes
Persistent baseline drift with deep, rapid breathing may be due to the patient's respiration moving the chest and electrodes. Recognizing respiration as the cause lets the technician coach calm breathing to steady the baseline.
- Posterior leads are most useful for evaluating which region of the heart that the standard 12-lead views poorly?
- The front of the heart
- The back (posterior) wall of the heart
- The right arm
- The lungs
Correct answer: The back (posterior) wall of the heart
Posterior leads are most useful for evaluating the back, or posterior, wall of the heart, which the standard 12-lead views poorly. Adding V7 through V9 across the back improves detection of changes in that region.
- A technician obtaining a Holter monitor application should also instruct the patient about device care, but the technician's acquisition responsibility during application is to:
- Diagnose any arrhythmia immediately
- Properly prepare the skin, securely apply the electrodes, and confirm the recorder is functioning
- Set the device to print at 25 mm per second
- Interpret the 24-hour recording on the spot
Correct answer: Properly prepare the skin, securely apply the electrodes, and confirm the recorder is functioning
During application, the technician's acquisition responsibility is to properly prepare the skin, securely apply the electrodes, and confirm the recorder is functioning. Good setup is what makes the extended recording usable, whereas interpretation belongs to the clinician.
- An EKG technician should verify the patient's name and identifiers print correctly on the EKG because:
- It ensures the tracing is attributed to the correct patient and is a complete, valid record
- It changes the heart rhythm
- It sets the gain to standard
- It removes artifact
Correct answer: It ensures the tracing is attributed to the correct patient and is a complete, valid record
Verifying identifiers print correctly ensures the tracing is attributed to the correct patient and is a complete, valid record. A correctly identified tracing prevents wrong-patient errors and meets documentation standards.
- When troubleshooting an EKG with widespread artifact, checking that the patient is not touching the metal bed rails or other conductive surfaces can help reduce:
- Wandering baseline only
- The calibration mark
- The paper speed
- Electrical interference reaching the patient
Correct answer: Electrical interference reaching the patient
Ensuring the patient is not touching metal bed rails or conductive surfaces can help reduce electrical interference reaching the patient. Limiting these contacts decreases stray current that contributes to a noisy tracing.
- The augmented limb leads (aVR, aVL, aVF) are derived by the EKG machine from the:
- Six chest electrodes
- A separate set of back electrodes
- The calibration pulse
- Limb electrodes already placed on the arms and legs
Correct answer: Limb electrodes already placed on the arms and legs
The augmented limb leads are derived from the limb electrodes already placed on the arms and legs. No additional electrodes are required because the machine combines the existing limb electrode signals to create these augmented views.
- If a technician places V1 and V2 too high, in the second intercostal space, the recorded tracing may show:
- A flat line in all leads
- Doubled paper speed
- Patterns that can be misread, such as altered P-wave or R-wave appearance
- No effect at all
Correct answer: Patterns that can be misread, such as altered P-wave or R-wave appearance
Placing V1 and V2 too high can produce patterns that can be misread, such as altered P-wave or R-wave appearance. Because these leads are sensitive to vertical position, an interspace error changes the morphology and risks misinterpretation.
- A patient on continuous telemetry is going to ambulate in the hallway. The technician should ensure the patient is on:
- A hardwired bedside-only monitor
- A 12-lead machine carried by hand
- No monitoring during walking
- An ambulatory telemetry transmitter that maintains the signal while walking
Correct answer: An ambulatory telemetry transmitter that maintains the signal while walking
For ambulation, the patient should be on an ambulatory telemetry transmitter that maintains the signal while walking. Unlike a hardwired bedside unit, the portable transmitter keeps the rhythm monitored as the patient moves.
- Why should an EKG technician confirm the standard 25 mm per second speed and standard gain before printing a diagnostic 12-lead?
- To change the patient's rhythm
- To remove the patient identifiers
- Because nonstandard settings can distort interval timing and amplitude measurements
- To disinfect the leads
Correct answer: Because nonstandard settings can distort interval timing and amplitude measurements
Confirming standard speed and gain matters because nonstandard settings can distort interval timing and amplitude measurements. Verifying these before printing ensures the tracing can be measured and interpreted accurately.
- An EKG technician must obtain a tracing on a patient with a thick chest dressing covering the usual V3 and V4 sites. The most appropriate action is to:
- Place V3 and V4 randomly elsewhere without noting it
- Place the electrodes as close to the correct landmarks as possible and document the modification
- Skip V3 and V4 with no documentation
- Cancel the EKG
Correct answer: Place the electrodes as close to the correct landmarks as possible and document the modification
The technician should place the electrodes as close to the correct landmarks as possible and document the modification. Getting as near the proper sites as the dressing allows, and noting the change, preserves usefulness while informing the interpreter.
- A technician is asked which single waveform on the tracing represents the spread of the impulse across both atria. The correct waveform is the:
- T wave
- QRS complex
- ST segment
- P wave
Correct answer: P wave
The waveform is the P wave. It records the wave of depolarization spreading from the SA node across the right and left atria, appearing as a small rounded deflection just ahead of the QRS complex.
- While reviewing a lead II strip, a technician sees that each P wave is a smooth, single rounded bump of low amplitude. The technician should recognize this normal shape as reflecting:
- Sequential depolarization of the right then left atrium
- Simultaneous depolarization of both ventricles
- Repolarization of the atria
- Conduction through the Purkinje network
Correct answer: Sequential depolarization of the right then left atrium
It reflects sequential atrial depolarization. The right atrium depolarizes slightly before the left, and in a normal heart these two events blend into one smooth, rounded P wave rather than a notched or peaked shape.
- A technician must report the duration of the QRS complex. The QRS is correctly measured from the:
- End of the P wave to the start of the T wave
- Start of the P wave to the start of the QRS
- Peak of the R wave to the peak of the T wave
- Start of the first QRS deflection to where it returns to baseline
Correct answer: Start of the first QRS deflection to where it returns to baseline
It is measured from the first QRS deflection to its return to baseline. The QRS duration spans the entire ventricular depolarization, beginning at the earliest Q, R, or S deflection and ending where the complex rejoins the baseline at the J point.
- On a strip, a technician sees a QRS made up of an initial downward deflection, a tall upward deflection, and a final downward deflection. The final downward deflection after the tall upward wave is the:
Correct answer: S wave
It is the S wave. After the initial Q wave and the upward R wave, any negative deflection that follows the R wave within the same complex is labeled the S wave by convention.
- A technician needs to identify the waveform that records ventricular recovery rather than ventricular contraction. That waveform is the:
- T wave
- Q wave
- P wave
- Delta wave
Correct answer: T wave
It is the T wave. While the QRS records ventricular depolarization, the T wave that follows records ventricular repolarization, the electrical recovery of the ventricles between beats.
- A patient's tracing shows broad, flat, low-amplitude T waves throughout. Flattened T waves are most commonly an early clue to:
- High calcium
- Low potassium
- Increased vagal tone
- Right atrial enlargement
Correct answer: Low potassium
They are an early clue to low potassium. Hypokalemia tends to flatten the T waves while accentuating the U waves, so broad, flat T waves should prompt the technician to consider low serum potassium.
- A technician measures the time from the onset of atrial depolarization to the onset of ventricular depolarization. This measurement is the:
- PR interval
- ST segment
- QT interval
- TP segment
Correct answer: PR interval
It is the PR interval. By definition, the PR interval spans from the start of the P wave to the start of the QRS, capturing the full conduction time from the atria through the AV node to the ventricles.
- A regular rhythm shows a P wave before every QRS, but the PR interval measures only 0.08 second and stays constant. A short, fixed PR interval should make the technician consider:
- An impulse arising near or below the AV junction
- First-degree AV block
- Complete heart block
- A prolonged QT interval
Correct answer: An impulse arising near or below the AV junction
It suggests an impulse arising near the AV junction. A PR interval under 0.12 second means the ventricles were reached unusually fast, which occurs when the impulse starts close to the junction or travels an accessory pathway rather than the slow normal route.
- A technician must determine whether a QT interval is prolonged. The QT interval is measured from the:
- Start of the P wave to the end of the T wave
- End of the QRS to the start of the T wave
- Start of the QRS to the end of the T wave
- Peak of the R wave to the end of the T wave
Correct answer: Start of the QRS to the end of the T wave
It is measured from the start of the QRS to the end of the T wave. The QT interval reflects the total time for the ventricles to depolarize and then fully repolarize, so it begins with the QRS and ends where the T wave returns to baseline.
- A technician notes that a patient's measured QT interval is long, but the heart rate is quite slow. To judge the QT fairly at this rate, the technician should rely on the:
- Raw uncorrected QT only
- Rate-corrected QT (QTc)
- PR interval
- Width of the P wave
Correct answer: Rate-corrected QT (QTc)
The technician should rely on the rate-corrected QT. Because the raw QT lengthens at slow rates and shortens at fast rates, the QTc adjusts for heart rate so the value can be compared fairly against normal limits.
- A patient with a documented prolonged QT interval is being monitored. The main reason this finding matters to the technician is that it raises the risk of:
- Atrial flutter
- First-degree AV block
- Torsades de pointes
- Wandering baseline
Correct answer: Torsades de pointes
It raises the risk of torsades de pointes. A long QT widens the vulnerable repolarization window, so a beat landing in that period can trigger this polymorphic ventricular tachycardia, which is why a prolonged QT is reported.
- Using the large-box method on a regular rhythm, a technician finds exactly three large boxes between consecutive R waves. The estimated heart rate is closest to:
- 150 beats per minute
- 75 beats per minute
- 100 beats per minute
- 60 beats per minute
Correct answer: 100 beats per minute
It is about 100 beats per minute. Dividing 300 by the three large boxes between R waves yields roughly 100 beats per minute on paper running at the standard 25 mm per second.
- A technician memorizes the sequence 300, 150, 100, 75, 60, 50 to estimate rate quickly. This sequence works by counting the heavy gridlines between two R waves because each heavy line is spaced:
- 0.20 second apart
- 0.04 second apart
- 0.40 second apart
- 1 second apart
Correct answer: 0.20 second apart
Each heavy line is 0.20 second apart. The 300-method sequence assigns a rate to each successive heavy gridline because the large boxes between them each represent 0.20 second at the standard paper speed.
- A technician counts 9 QRS complexes in a clearly marked 6-second strip. Using the 6-second method, the estimated heart rate is:
- 90 beats per minute
- 54 beats per minute
- 45 beats per minute
- 9 beats per minute
Correct answer: 90 beats per minute
It is 90 beats per minute. The 6-second method multiplies the number of QRS complexes in the 6-second window by 10, so 9 complexes correspond to a rate of 90 beats per minute.
- A technician chooses the 6-second method instead of the large-box method for a particular strip. The most appropriate reason for this choice is that the rhythm is:
- Perfectly regular at a slow rate
- Irregular, so individual R-R intervals vary
- A clean normal sinus rhythm
- A paced rhythm with consistent capture
Correct answer: Irregular, so individual R-R intervals vary
The reason is that the rhythm is irregular. When R-R intervals vary, a single interval would give a misleading rate, so averaging all complexes across a 6-second window with the 6-second method provides a more representative number.
- A technician confirms a rhythm meets all the criteria for normal sinus rhythm. One required criterion is that the rhythm must be:
- Irregularly irregular
- Regular, with constant R-R intervals
- Faster than 100 beats per minute
- Marked by varying P wave shapes
Correct answer: Regular, with constant R-R intervals
It must be regular. Normal sinus rhythm requires a regular rhythm with constant R-R intervals, a rate of 60 to 100, and an upright, uniform P wave before each QRS with a normal PR interval.
- A technician records a regular rhythm at 70 beats per minute with a uniform upright P wave before each narrow QRS and a PR of 0.16 second. The most appropriate way to document this rhythm is:
- Sinus tachycardia
- Atrial flutter
- Junctional rhythm
- Normal sinus rhythm
Correct answer: Normal sinus rhythm
It is normal sinus rhythm. A regular rate within 60 to 100, an upright uniform P wave preceding every QRS, and a normal PR interval together satisfy the definition of normal sinus rhythm.
- A patient resting quietly shows a regular sinus rhythm at 50 beats per minute with normal P waves and intervals. The technician should document this as:
- Idioventricular rhythm
- Junctional escape rhythm
- Sinus arrhythmia
- Sinus bradycardia
Correct answer: Sinus bradycardia
It is sinus bradycardia. The rhythm satisfies all sinus criteria except that the rate is below 60 beats per minute, so it is simply a slow sinus rhythm rather than an escape rhythm.
- A patient who became anxious during the procedure shows a regular rhythm at 118 beats per minute with a normal upright P wave before each narrow QRS. The technician should document this as:
- Atrial flutter
- Supraventricular tachycardia
- Sinus tachycardia
- Multifocal atrial tachycardia
Correct answer: Sinus tachycardia
It is sinus tachycardia. The rhythm keeps every sinus feature, including an upright P wave before each QRS, but the rate exceeds 100, so it is a fast sinus rhythm, which is sinus tachycardia.
- A technician sees a strip that is irregularly irregular, has no discernible P waves, and shows a wavy, undulating baseline. The most appropriate identification is:
- Atrial flutter
- Sinus arrhythmia
- Atrial fibrillation
- First-degree AV block
Correct answer: Atrial fibrillation
It is atrial fibrillation. The hallmark combination of an irregularly irregular ventricular rhythm, absence of organized P waves, and a quivering fibrillatory baseline defines atrial fibrillation.
- A patient with atrial fibrillation has a ventricular rate averaging 60 beats per minute. This is most accurately documented as atrial fibrillation with a:
- Rapid ventricular response
- Controlled ventricular response
- Fixed 3:1 block
- Junctional escape
Correct answer: Controlled ventricular response
It is a controlled ventricular response. When the AV node passes the chaotic atrial impulses at a rate that keeps the ventricles roughly within 60 to 100, the rhythm is documented as atrial fibrillation with a controlled ventricular response.
- A technician must explain why no measurable atrial rate can be reported on an atrial fibrillation strip. The best explanation is that the atria are:
- Beating slowly but normally
- Producing regular sawtooth waves
- Completely electrically silent
- Depolarizing chaotically with no organized, countable P waves
Correct answer: Depolarizing chaotically with no organized, countable P waves
The atria are depolarizing chaotically. In atrial fibrillation many atrial sites fire disorganized impulses, producing a quivering baseline of irregular fibrillatory waves rather than discrete countable P waves, so a single atrial rate cannot be reported.
- A regular rhythm shows uniform sawtooth waves at an atrial rate near 300 per minute, with a QRS after every third sawtooth wave. The technician should document this as:
- Atrial flutter with 3:1 conduction
- Atrial fibrillation
- Multifocal atrial tachycardia
- Sinus tachycardia
Correct answer: Atrial flutter with 3:1 conduction
It is atrial flutter with 3:1 conduction. Regular sawtooth flutter waves near 300 per minute, with the AV node conducting only every third wave to the ventricles, define atrial flutter with a 3:1 conduction ratio.
- A technician notes that the regular sawtooth flutter waves on a strip are usually easiest to identify in the inferior leads. Those inferior leads are:
- V1, V2, and V3
- II, III, and aVF
- I, aVL, and V6
- aVR and aVL
Correct answer: II, III, and aVF
They are leads II, III, and aVF. The sawtooth flutter waves of atrial flutter are typically most visible in the inferior leads, which view the bottom surface of the heart and best display the regular flutter pattern.
- A technician identifies an early beat that has an abnormally shaped P wave followed by a normal narrow QRS, occurring sooner than the next expected sinus beat. This is best classified as a:
- Premature atrial contraction
- Premature ventricular contraction
- Junctional escape beat
- Ventricular escape beat
Correct answer: Premature atrial contraction
It is a premature atrial contraction. An early beat with an abnormal P wave but a normal narrow QRS arises from an ectopic atrial focus, and because the impulse still uses the normal ventricular pathway, the QRS looks normal.
- A technician sees frequent premature atrial contractions and must explain their origin. A premature atrial contraction arises from:
- The Purkinje fibers
- The SA node firing on time
- A ventricular focus below the bundle of His
- An ectopic focus in the atria firing early
Correct answer: An ectopic focus in the atria firing early
It arises from an early-firing ectopic atrial focus. A premature atrial contraction occurs when a site in the atria outside the SA node fires before the next expected sinus beat, producing an early, abnormally shaped P wave.
- A technician identifies an early, wide, bizarre QRS that has no P wave in front of it. This beat is most consistent with a:
- Premature ventricular contraction
- Premature junctional contraction
- Premature atrial contraction
- Sinus beat
Correct answer: Premature ventricular contraction
It is a premature ventricular contraction. An early, wide, bizarre QRS without a preceding P wave arises from an ectopic ventricular focus, and the wide shape reflects abnormal spread through the ventricular muscle.
- A technician must explain why a premature ventricular contraction produces a wide QRS rather than a narrow one. The best explanation is that the impulse:
- Travels the fast normal His-Purkinje pathway
- Spreads slowly muscle-to-muscle through the ventricles
- Originates in the SA node
- Conducts backward into the atria first
Correct answer: Spreads slowly muscle-to-muscle through the ventricles
It spreads slowly muscle-to-muscle. Because a premature ventricular contraction starts in ventricular tissue rather than the normal conduction system, the impulse moves cell to cell across the ventricles, producing a wide, abnormal QRS.
- A technician sees a rapid, regular, wide-complex rhythm at 175 beats per minute with uniform QRS shapes and no visible P waves. The most appropriate identification is:
- Atrial fibrillation
- Supraventricular tachycardia
- Ventricular tachycardia
- Sinus tachycardia
Correct answer: Ventricular tachycardia
It is ventricular tachycardia. A fast, regular, wide-QRS rhythm with uniform complexes and no discernible P waves indicates a ventricular origin and is identified as ventricular tachycardia, a dangerous arrhythmia.
- A technician detects a brief run of three consecutive premature ventricular contractions at a fast rate, after which sinus rhythm resumes. This brief run is best described as:
- A couplet
- Ventricular bigeminy
- A short run of ventricular tachycardia
- An interpolated PVC
Correct answer: A short run of ventricular tachycardia
It is a short run of ventricular tachycardia. By convention, three or more consecutive premature ventricular contractions at a rapid rate constitute a run of ventricular tachycardia, which the technician should report.
- A monitored, pulseless patient suddenly shows a chaotic, irregular waveform with no identifiable QRS complexes. The technician should recognize this as:
- Atrial fibrillation
- Sinus arrest
- Idioventricular rhythm
- Ventricular fibrillation
Correct answer: Ventricular fibrillation
It is ventricular fibrillation. A pulseless patient with a completely disorganized, chaotic waveform and no discrete complexes is in ventricular fibrillation, a lethal rhythm requiring immediate emergency response.
- A technician must explain why ventricular fibrillation produces no pulse. The best explanation is that during this rhythm the ventricles:
- Beat too slowly to be felt
- Contract forcefully but too fast
- Quiver chaotically without an organized contraction
- Are paced by the SA node
Correct answer: Quiver chaotically without an organized contraction
The ventricles quiver without organized contraction. In ventricular fibrillation the ventricular muscle fibers contract chaotically and independently, so no coordinated squeeze occurs and no blood is pumped, producing no pulse.
- A monitored patient's tracing becomes a flat line with no waveforms. Before identifying asystole, the most important verification step is to:
- Increase the gain to double standard
- Switch to a printout of only lead aVR
- Change the paper speed to 50 mm per second
- Confirm lead and electrode connections and check the patient
Correct answer: Confirm lead and electrode connections and check the patient
The step is to confirm the connections and check the patient. A loose or disconnected lead can mimic a flat line, so verifying the electrodes and assessing the patient must be done before identifying true asystole.
- A technician knows that one rhythm can closely mimic asystole when viewed in a single lead. To avoid mistaking it for a flat line, the technician should also check another lead for:
- A prolonged PR interval
- Fine ventricular fibrillation
- A pathological Q wave
- Right atrial enlargement
Correct answer: Fine ventricular fibrillation
The technician should check for fine ventricular fibrillation. Fine ventricular fibrillation can appear nearly flat in one lead, so confirming the rhythm in a second lead helps distinguish it from true asystole, which changes the response.
- A technician documents a regular rhythm in which every P wave conducts to a QRS but the PR interval is consistently 0.24 second on each beat. The best identification is:
- First-degree AV block
- Mobitz type II block
- Wenckebach block
- Third-degree heart block
Correct answer: First-degree AV block
It is first-degree AV block. A uniformly prolonged PR interval beyond 0.20 second in which every P wave still produces a QRS reflects delayed conduction rather than dropped beats, defining first-degree AV block.
- A technician must explain to a student where the conduction delay occurs in first-degree AV block. The delay is primarily located at the:
- SA node
- Ventricular muscle
- Purkinje fibers
- AV node
Correct answer: AV node
It is located at the AV node. First-degree AV block reflects slowed conduction through the AV node, which lengthens the PR interval while still allowing every atrial impulse to reach the ventricles.
- A strip shows the PR interval growing progressively longer over several beats until a QRS is dropped, then the cycle repeats. This pattern defines:
- Wenckebach (Mobitz I) block
- First-degree AV block
- Mobitz type II block
- Third-degree heart block
Correct answer: Wenckebach (Mobitz I) block
It is Wenckebach. The defining feature of Mobitz type I (Wenckebach) second-degree AV block is progressive PR lengthening that ends in a dropped QRS, after which the cycle of lengthening begins again.
- A technician notes the grouped-beating appearance of Wenckebach, with clusters of beats separated by pauses. This grouping occurs because:
- Every P wave fails to conduct
- The QRS widens with each beat
- The atria stop firing intermittently
- A beat is periodically dropped after progressive PR lengthening
Correct answer: A beat is periodically dropped after progressive PR lengthening
It occurs because a beat is periodically dropped. As the PR interval lengthens beat by beat in Wenckebach, eventually one P wave fails to conduct, creating a pause that separates the clusters and produces the grouped-beating look.
- A strip shows several conducted beats with a fixed PR interval, then a sudden non-conducted P wave with no change in the preceding PR intervals. This is best identified as:
- Wenckebach block
- First-degree AV block
- Mobitz type II block
- Sinus arrhythmia
Correct answer: Mobitz type II block
It is Mobitz type II block. The conducted beats keep a constant PR interval and then a QRS is dropped abruptly without any progressive lengthening, which distinguishes Mobitz type II from Wenckebach.
- A technician must report which second-degree AV block is more dangerous and more likely to require a pacemaker. The correct answer is:
- Mobitz type I (Wenckebach)
- Any block with a narrow QRS
- Mobitz type II
- A block with grouped beating
Correct answer: Mobitz type II
It is Mobitz type II. Because the conduction defect lies low in the His-Purkinje system, Mobitz type II is more likely than Wenckebach to progress to complete heart block and more often requires a pacemaker.
- A strip shows an atrial rate of 88 and a ventricular rate of 36, each regular but with no consistent relationship between P waves and QRS complexes. The best identification is:
- First-degree AV block
- 2:1 second-degree AV block
- Wenckebach block
- Third-degree (complete) heart block
Correct answer: Third-degree (complete) heart block
It is third-degree heart block. When the atria and ventricles each maintain their own regular but completely independent rates with no fixed PR relationship, the chambers are dissociated, defining complete heart block.
- In complete heart block, the technician should understand that the ventricular escape rate is slower than the atrial rate because:
- The SA node has stopped firing
- No atrial impulses reach the ventricles, so a slower backup pacemaker takes over
- The QT interval has shortened
- The atria are fibrillating
Correct answer: No atrial impulses reach the ventricles, so a slower backup pacemaker takes over
No atrial impulses reach the ventricles. In third-degree block the atria continue at the sinus rate while a slower escape pacemaker below the block independently drives the ventricles, so the ventricular rate is lower.
- A technician identifies a wide QRS of 0.13 second with normal P waves, a normal PR interval, and an abnormal QRS shape in V1 and V6. The most appropriate identification is:
- First-degree AV block
- Junctional rhythm
- Bundle branch block
- Prolonged QT interval
Correct answer: Bundle branch block
It is a bundle branch block. A QRS of 0.12 second or wider with normal atrial activity and altered QRS morphology in V1 and V6 reflects delayed activation of one ventricle through a blocked bundle branch.
- A technician explains why a bundle branch block widens the QRS. The widening occurs because the affected ventricle is activated:
- Faster than normal through the Purkinje fibers
- Late, by slow cell-to-cell spread from the other ventricle
- By the SA node directly
- Before the atria depolarize
Correct answer: Late, by slow cell-to-cell spread from the other ventricle
It is activated late by slow cell-to-cell spread. When one bundle branch is blocked, that ventricle cannot use the fast Purkinje pathway and is instead depolarized slowly from the opposite ventricle, widening the QRS.
- A technician sees a small, sharp vertical deflection immediately preceding each QRS on a paced patient's strip. This deflection is best identified as a:
- Pacemaker spike
- U wave
- Delta wave
- J point
Correct answer: Pacemaker spike
It is a pacemaker spike. An artificial pacemaker delivers a brief stimulus that appears as a narrow, sharp vertical line just before the chamber it stimulates depolarizes.
- On a paced strip, a technician notes that each ventricular pacing spike is reliably followed by a wide QRS. This indicates the pacemaker is achieving appropriate:
- Atrial sensing
- Undersensing
- Failure to capture
- Ventricular capture
Correct answer: Ventricular capture
It indicates ventricular capture. When each pacing spike is immediately followed by a wide QRS, the stimulus is successfully depolarizing the ventricle, which is called ventricular capture.
- A technician sees pacemaker spikes on the strip that are not followed by any P wave or QRS complex. This finding should be reported as:
- Appropriate sensing
- Failure to capture
- Normal demand pacing
- Ventricular tachycardia
Correct answer: Failure to capture
It is failure to capture. When pacemaker spikes appear but no depolarization follows, the stimulus is not capturing the myocardium, a malfunction the technician should report.
- A 12-lead shows ST segment elevation grouped in leads II, III, and aVF. This pattern most directly suggests injury to which wall of the heart?
- Anterior wall
- Septal area
- Lateral wall
- Inferior wall
Correct answer: Inferior wall
It suggests inferior wall injury. Leads II, III, and aVF view the inferior surface of the heart, so ST elevation grouped across these leads points to an inferior wall myocardial event.
- A technician must explain what ST segment elevation classically represents in an acute coronary event. It most classically indicates:
- A normal repolarization variant
- Reversible ischemia only
- Acute myocardial injury
- An old, healed infarction
Correct answer: Acute myocardial injury
It indicates acute myocardial injury. When a region of heart muscle is acutely injured by interrupted blood flow, the ST segment rises above the baseline, signaling active injury that warrants urgent attention.
- To judge whether the ST segment is elevated or depressed, a technician uses a reference baseline taken at the:
- Peak of the T wave
- Peak of the R wave
- TP segment between the T wave and the next P wave
- Middle of the QRS
Correct answer: TP segment between the T wave and the next P wave
It is taken at the TP segment. The flat TP segment between the end of one T wave and the start of the next P wave is the true electrical baseline used to measure ST elevation or depression.
- A patient with chest pain shows symmetric T wave inversion and horizontal ST depression in the lateral leads without ST elevation. This combination most classically represents:
- Myocardial ischemia
- Acute injury
- A completed infarction
- Normal early repolarization
Correct answer: Myocardial ischemia
It most classically represents myocardial ischemia. T wave inversion with ST depression in leads that normally sit near baseline reflects reduced blood flow without full-thickness injury, the hallmark of ischemia.
- A technician reviews the classic EKG progression of coronary disease: ischemia, injury, then infarction. The marker that classically signals a completed infarction with tissue death is the:
- Peaked T wave
- ST segment depression
- Short PR interval
- Pathological Q wave
Correct answer: Pathological Q wave
It is the pathological Q wave. A wide, deep Q wave develops as muscle dies and persists as a lasting marker of a completed or prior myocardial infarction, unlike the reversible changes of ischemia or acute injury.
- A technician must distinguish a pathological Q wave from a normal septal q wave. A pathological Q wave is generally:
- Narrower than 0.02 second
- At least 0.04 second wide or deeper than one-fourth the R wave height
- Always upright
- Seen only in lead aVR
Correct answer: At least 0.04 second wide or deeper than one-fourth the R wave height
It is at least 0.04 second wide or deeper than one-fourth the R wave. A Q wave meeting these size criteria is considered pathological and suggests prior infarction, unlike the small, narrow normal septal q wave.
- A patient in kidney failure shows tall, narrow, sharply peaked T waves on the monitor. This finding should prompt the technician to suspect:
- Low calcium
- Hyperkalemia
- Hypothermia
- Left atrial enlargement
Correct answer: Hyperkalemia
It should prompt suspicion of hyperkalemia. Tall, narrow, peaked T waves are an early and characteristic EKG sign of elevated serum potassium, which is common in kidney failure and should be reported.
- A patient with severe hyperkalemia shows progression beyond peaked T waves. As potassium climbs further, the technician would expect the QRS complex to become:
- Narrower
- Progressively wider
- Completely absent at once
- Inverted into a Q wave
Correct answer: Progressively wider
The QRS becomes progressively wider. As hyperkalemia worsens, conduction slows and the QRS widens, a dangerous progression that can advance toward a sine-wave pattern if untreated.
- A technician identifies the structure that normally initiates each heartbeat and sets the heart's pace. That structure is the:
- SA node
- AV node
- Bundle of His
- Purkinje fibers
Correct answer: SA node
It is the SA node. Located in the upper right atrium, the sinoatrial node has the fastest intrinsic firing rate and normally starts each heartbeat as the heart's primary pacemaker.
