Certified EKG Technician (CET) Exam — Questions and Answers

Question 1: Why is Stress Testing & Holter Monitoring essential for EKG technicians?

It is only relevant for cardiologists.
It is irrelevant to the EKG testing process.
It ensures accurate EKG readings and proper diagnosis of heart conditions. (Correct answer)
It is only used for educational purposes.

Correct answer: It ensures accurate EKG readings and proper diagnosis of heart conditions.

For EKG technicians, proficiency in Stress Testing and Holter Monitoring is essential for correctly performing these complex diagnostic procedures. Their expertise ensures accurate data acquisition, proper lead placement, and effective patient monitoring. This precision is crucial for physicians to make correct diagnoses and guide patient treatment effectively, directly impacting the quality of care.

Question 2: What color is the right arm electrode lead wire in the standard US (AHA) color coding system?

White (Correct answer)
Red
Green
Black

Correct answer: White

In the AHA color coding system used in the US, the right arm electrode is white, while the left arm is black, right leg is green, and left leg is red.

Question 3: Which of the following describes the function of a right leg (RL/N) electrode in a 12-lead EKG?

It records the inferior leads
It balances the precordial leads
It serves as a ground electrode to reduce electrical interference (Correct answer)
It measures right ventricular activity

Correct answer: It serves as a ground electrode to reduce electrical interference

The right leg electrode acts as a ground (neutral) electrode that helps cancel out electrical noise and interference, improving signal quality.

Question 4: What is the importance of Stress Testing & Holter Monitoring in EKG certification?

It only applies to advanced medical procedures.
It has no impact on patient outcomes.
It is crucial for understanding the heart's electrical activity and ensuring accurate results. (Correct answer)
It is irrelevant for proper diagnosis.

Correct answer: It is crucial for understanding the heart's electrical activity and ensuring accurate results.

Stress Testing and Holter Monitoring are vital because they provide dynamic insights into the heart's electrical activity under various conditions that a resting EKG might miss. Stress tests reveal how the heart performs under exertion, while Holter monitoring captures intermittent arrhythmias over extended periods. This comprehensive data is crucial for ensuring accurate diagnostic results and a thorough understanding of cardiac function.

Question 5: A technician notices lead III has an inverted P wave and upright QRS. Which electrode misplacement is most likely?

Right leg and left leg electrodes are reversed
Left arm and left leg electrodes are reversed
V1 and V2 electrodes are swapped
Right arm and left arm electrodes are reversed (Correct answer)

Correct answer: Right arm and left arm electrodes are reversed

Reversal of the right arm and left arm electrodes causes lead III to display characteristics normally seen in other leads, including P-wave inversion.

Question 6: Why is accurate Safety & Infection Control Protocols essential for patient care?

It is mainly used in emergency situations.
It is necessary for proper patient diagnosis and care. (Correct answer)
It is irrelevant for overall patient well-being.
It is necessary for assessing heart function accurately.

Correct answer: It is necessary for proper patient diagnosis and care.

Accurate adherence to Safety & Infection Control Protocols is paramount for protecting patients from harm and preventing healthcare-associated infections. By ensuring a safe environment, these protocols allow for the reliable performance of diagnostic tests, which are essential for proper diagnosis and the delivery of effective, uninterrupted patient care. This directly contributes to overall patient well-being.

Question 7: Which EKG finding is characterized by a shortened PR interval and a delta wave?

Wolff-Parkinson-White syndrome (Correct answer)
Atrial flutter
Bundle branch block
First-degree AV block

Correct answer: Wolff-Parkinson-White syndrome

WPW syndrome features a short PR interval, delta wave, and widened QRS due to an accessory pathway.

Question 8: What part of the EKG shows how long the ventricles were in systole?

PR segmentQT interval
QT interval (Correct answer)
ST segment
QRS complex

Correct answer: QT interval

The QT interval on an EKG represents the total duration of ventricular depolarization and repolarization. Since ventricular systole (contraction) encompasses both these electrical events, the QT interval provides an approximation of the time the ventricles spend in systole. Abnormalities in QT interval length can indicate serious cardiac conditions.

Question 9: On the ECG, _______ is produced when a depolarization wavefront moves perpendicular to a positive electrode.

equiphasic or isoelectric complexes
a negative deflection (Correct answer)
electronic noise
a positive deflection

Correct answer: a negative deflection

On an ECG, the direction of the electrical depolarization wavefront relative to a positive electrode determines the deflection. A positive deflection occurs when the wavefront moves towards the electrode, and a negative deflection occurs when it moves away. While a wavefront moving *exactly* perpendicular to a positive electrode typically produces an equiphasic or isoelectric complex, if the net vector has a significant component moving away, a negative deflection can be recorded.

Question 10: A rhythm strip reveals a regular ventricular rate of 150 bpm with narrow QRS complexes. P waves are present but are inverted in leads II, III, and aVF and immediately precede each QRS. What is the MOST likely rhythm?

Junctional tachycardia (Correct answer)
Atrial flutter with 2:1 block
Ventricular tachycardia
Sinus tachycardia

Correct answer: Junctional tachycardia

Inverted P waves in the inferior leads (II, III, aVF) immediately before narrow QRS complexes indicate retrograde atrial activation originating near or at the AV node — the hallmark of junctional tachycardia. Sinus tachycardia produces upright P waves in lead II; atrial flutter shows sawtooth flutter waves; ventricular tachycardia produces wide QRS complexes.

Question 11: A rhythm strip shows an irregularly irregular rhythm with no discernible P waves and a ventricular rate of 130 bpm. What is the MOST likely interpretation?

Multifocal atrial tachycardia
Sinus arrhythmia
Atrial flutter with variable block
Atrial fibrillation with rapid ventricular response (Correct answer)

Correct answer: Atrial fibrillation with rapid ventricular response

An irregularly irregular rhythm with absent P waves and a rapid ventricular rate is the classic presentation of atrial fibrillation with rapid ventricular response.

Question 12: What is the importance of Safety & Infection Control Protocols in EKG certification?

It is crucial for understanding the heart's electrical activity and ensuring accurate results. (Correct answer)
It has no impact on patient outcomes.
It is irrelevant for proper diagnosis.
It only applies to advanced medical procedures.

Correct answer: It is crucial for understanding the heart's electrical activity and ensuring accurate results.

While primarily focused on patient and staff well-being, adherence to Safety & Infection Control Protocols indirectly supports accurate EKG results. By preventing complications like infections or adverse events, these protocols ensure a stable testing environment. This stability is essential for obtaining clear, artifact-free EKG readings, which are fundamental for accurately understanding the heart's electrical activity and making reliable diagnoses.

Question 13: Why is documentation important in Stress Testing & Holter Monitoring?

It is only used for billing purposes.
It provides a legal and medical record of diagnostic results. (Correct answer)
It is irrelevant to patient care.
It is not necessary unless requested.

Correct answer: It provides a legal and medical record of diagnostic results.

Documentation in Stress Testing and Holter Monitoring is critical as it creates a comprehensive legal and medical record of the diagnostic process and results. This detailed record includes patient responses, EKG findings, and any interventions, ensuring continuity of care and accountability. It serves as an essential reference for future medical decisions, legal purposes, and quality assurance.

Question 14: During a pharmacologic stress test using adenosine, which side effect should the EKG technician expect and prepare for?

Sustained ventricular tachycardia
Permanent AV block
Acute hypertensive crisis
Transient chest tightness and flushing (Correct answer)

Correct answer: Transient chest tightness and flushing

Adenosine commonly causes transient chest tightness, flushing, and brief AV conduction delays that resolve quickly due to its ultra-short half-life.

Question 15: How does Safety & Infection Control Protocols affect patient outcomes?

It has a long-term impact on improving heart health and preventing complications. (Correct answer)
It is irrelevant to long-term health outcomes.
It only affects short-term health outcomes.
It only impacts physical health.

Correct answer: It has a long-term impact on improving heart health and preventing complications.

Adherence to Safety & Infection Control Protocols profoundly impacts patient outcomes by preventing healthcare-associated infections and procedural complications. By ensuring a safe diagnostic and treatment environment, these protocols safeguard patient health, allowing for effective management of cardiac conditions. This proactive approach contributes to better long-term heart health, reduces morbidity, and prevents costly complications.

Question 16: How does Stress Testing & Holter Monitoring affect treatment decisions?

It has no impact on treatment decisions.
It provides insights that guide the selection of appropriate interventions. (Correct answer)
It does not contribute to treatment planning.
It is used only for diagnostic purposes.

Correct answer: It provides insights that guide the selection of appropriate interventions.

Stress Testing and Holter Monitoring significantly affect treatment decisions by providing detailed insights into the heart's function and rhythm. The data gathered, such as the presence of ischemia or specific arrhythmias, guides clinicians in selecting the most appropriate interventions. This can range from medication adjustments to recommendations for lifestyle changes or advanced cardiac procedures, ensuring targeted and effective treatment.

Question 17: The coronary sinus drains deoxygenated blood from the cardiac veins into which chamber?

Left ventricle
Right atrium (Correct answer)
Right ventricle
Left atrium

Correct answer: Right atrium

The coronary sinus empties deoxygenated blood from the myocardial circulation directly into the right atrium.

Question 18: During a cardiac stress test, what is the primary reason for monitoring the ST segment on the EKG?

To measure heart rate recovery time
To detect exercise-induced myocardial ischemia (Correct answer)
To assess QT interval prolongation
To evaluate atrial flutter patterns

Correct answer: To detect exercise-induced myocardial ischemia

ST segment depression during exercise is the hallmark EKG finding that indicates myocardial ischemia due to inadequate coronary blood flow.

Question 19: Which group of leads represents the lateral wall of the left ventricle?

aVR, V1, and V2
I, aVL, V5, and V6 (Correct answer)
V1, V2, V3, and V4
II, III, and aVF

Correct answer: I, aVL, V5, and V6

Leads I, aVL, V5, and V6 provide views of the lateral wall of the left ventricle.

Question 20: What is the significance of a drop in systolic blood pressure greater than 10 mmHg during an exercise stress test despite increasing workload?

It reflects medication effects and is not clinically relevant
It is a normal response to prolonged exercise
It indicates the patient has reached maximum aerobic capacity
It suggests severe coronary artery disease or left ventricular dysfunction (Correct answer)

Correct answer: It suggests severe coronary artery disease or left ventricular dysfunction

An exercise-induced drop in systolic blood pressure indicates the heart cannot increase cardiac output appropriately, suggesting severe CAD or pump failure.

Question 21: In Einthoven's triangle, Lead I measures the potential difference between which two electrodes?

Right arm (positive) and left leg (negative)
Left arm (positive) and left leg (negative)
Left arm (positive) and right arm (negative) (Correct answer)
Left leg (positive) and right arm (negative)

Correct answer: Left arm (positive) and right arm (negative)

Lead I records the voltage difference from the right arm (negative) to the left arm (positive).

Question 22: An EKG shows a short PR interval, delta waves, and a wide QRS complex in an asymptomatic patient. Which condition does this pattern indicate?

Brugada syndrome
Hypertrophic cardiomyopathy
Wolff-Parkinson-White syndrome (Correct answer)
Lown-Ganong-Levine syndrome

Correct answer: Wolff-Parkinson-White syndrome

A short PR interval with delta waves and widened QRS complex is the classic triad of Wolff-Parkinson-White syndrome caused by an accessory pathway.

Question 23: Which precordial lead is placed at the fourth intercostal space to the right of the sternum?

V2
V1 (Correct answer)
V3
V4

Correct answer: V1

V1 is placed at the fourth intercostal space just to the right of the sternum, making it one of the two septal leads.

Question 24: A patient's EKG leads accidentally contact a wet surface during the procedure. What is the immediate concern?

Damage to the EKG machine
Electrical shock hazard to the patient (Correct answer)
Signal artifact on the tracing
Increased skin impedance

Correct answer: Electrical shock hazard to the patient

Wet surfaces create a conductive pathway that increases the risk of electrical current reaching the patient, posing a shock hazard.

Question 25: On an EKG, what is the normal duration of the QRS complex?

0.12 to 0.20 seconds
0.20 to 0.24 seconds
0.04 to 0.06 seconds
0.06 to 0.10 seconds (Correct answer)

Correct answer: 0.06 to 0.10 seconds

The normal QRS duration is 0.06 to 0.10 seconds, representing the time for ventricular depolarization through the His-Purkinje system.

Question 26: Which heart valve separates the left atrium from the left ventricle?

Pulmonic valve
Mitral valve (Correct answer)
Tricuspid valve
Aortic valve

Correct answer: Mitral valve

The mitral (bicuspid) valve is located between the left atrium and left ventricle, preventing backflow during ventricular contraction.

Question 27: What is the most appropriate action when a patient's systolic blood pressure drops by more than 10 mmHg from baseline during an exercise stress test despite increasing workload?

Continue monitoring and document the finding for the interpreting physician
Immediately terminate the stress test as this is an absolute indication to stop (Correct answer)
Administer sublingual nitroglycerin and continue the test at the same stage
Increase the treadmill speed to push the patient to target heart rate

Correct answer: Immediately terminate the stress test as this is an absolute indication to stop

A drop in systolic blood pressure of ≥10 mmHg from baseline during increasing exercise — known as exertional hypotension — is an absolute indication to stop the stress test immediately, as it may signal severe left ventricular dysfunction or hemodynamic instability.

Question 28: How does Electrode Placement & Lead Systems affect patient outcomes?

It has a long-term impact on improving heart health and preventing complications. (Correct answer)
It only affects short-term health outcomes.
It is irrelevant to long-term health outcomes.
It only impacts physical health.

Correct answer: It has a long-term impact on improving heart health and preventing complications.

By enabling accurate diagnosis and guiding effective treatment, proper electrode placement and lead systems contribute significantly to positive long-term patient outcomes. This includes improving overall heart health, preventing the progression of cardiac conditions, and reducing the likelihood of future complications like heart attacks or strokes. The foundational accuracy it provides underpins all subsequent care, leading to better health and quality of life.

Question 29: A rhythm strip shows irregularly irregular R-R intervals with no discernible P waves. What is the most likely rhythm?

Atrial flutter
Sinus arrhythmia
Multifocal atrial tachycardia
Atrial fibrillation (Correct answer)

Correct answer: Atrial fibrillation

Irregularly irregular rhythm with absent P waves is the hallmark of atrial fibrillation.

Question 30: A technician finishes an EKG and removes the electrodes from the patient. In what order should the technician proceed?

Remove gloves, immediately touch the EKG machine to save the tracing, then wash hands
Document the procedure while still gloved, then remove gloves
Remove gloves, perform hand hygiene, then document the procedure (Correct answer)
Perform hand hygiene first, then remove gloves, then document

Correct answer: Remove gloves, perform hand hygiene, then document the procedure

The correct sequence is to remove and discard gloves (which are now contaminated), then perform hand hygiene before touching any clean surface or documenting. Touching the machine or documentation while gloved transfers contamination.

Question 31: Which EKG filter setting is used to reduce muscle artifact and motion noise while potentially affecting high-frequency components?

0.05 Hz high-pass filter
40 Hz low-pass filter (Correct answer)
150 Hz low-pass filter
60 Hz notch filter

Correct answer: 40 Hz low-pass filter

The 40 Hz low-pass filter reduces high-frequency muscle noise but may slightly reduce the amplitude of sharp waveform components like the QRS.

Question 32: After completing a 48-hour Holter recording, the patient returns the device. The technician notices the electrode in lead V5 position had poor skin contact for the last 12 hours, producing significant artifact. What is the most appropriate next step?

Discard the entire recording and repeat the Holter immediately
Re-apply the electrode and extend the recording by another 12 hours to compensate
Note the artifact in the report, analyze the remaining clean lead data, and flag the affected time period for the interpreting physician (Correct answer)
Report the full 48 hours of data as valid since two leads remained clean

Correct answer: Note the artifact in the report, analyze the remaining clean lead data, and flag the affected time period for the interpreting physician

Partial artifact does not invalidate an entire Holter study. The technician should document which channels and time periods were affected by poor contact, analyze the usable data from the remaining leads, and clearly communicate these limitations to the interpreting physician.

Question 33: A patient's EKG shows an unexpectedly long QTc interval. What is the EKG technician's responsibility?

Re-record the EKG at double standard sensitivity
Immediately notify the appropriate clinical staff or ordering provider of the abnormal finding (Correct answer)
Diagnose the patient and recommend medication adjustment
Document the finding in personal notes only

Correct answer: Immediately notify the appropriate clinical staff or ordering provider of the abnormal finding

EKG technicians are not authorized to diagnose, but they are responsible for promptly communicating critical or unexpected findings to the appropriate clinical personnel.

Question 34: The term "ventricular diastole" means ventricular:

Contraction
Relaxation
Pressure ratio
Filling time (Correct answer)

Correct answer: Filling time

Ventricular diastole refers to the period when the ventricles of the heart are relaxed and filling with blood. During this phase, the atrioventricular valves are open, allowing blood to flow from the atria into the ventricles. This filling time is crucial for ensuring adequate blood volume for the next contraction and maintaining cardiac output.

Question 35: By whom was the electrocardiogram created?

Steward
Wilhelm His
Hubert Mann
Willem Einthoven (Correct answer)

Correct answer: Willem Einthoven

Willem Einthoven, a Dutch physiologist, is widely credited with inventing the first practical electrocardiograph in 1903. He also established the standard nomenclature for the waves (P, Q, R, S, T) observed on an ECG, laying the foundational principles for modern electrocardiography and its use in diagnosing heart conditions.

Question 36: What position should a patient be in when a resting 12-lead EKG is performed?

Semi-Fowler's position at 45 degrees
Supine (lying flat) with arms at the sides (Correct answer)
Sitting upright at 90 degrees
Left lateral decubitus

Correct answer: Supine (lying flat) with arms at the sides

The patient should be supine with arms relaxed at the sides to standardize electrode position, minimize muscle artifact, and ensure reproducible results.

Question 37: A Holter monitor records continuously for 24–48 hours. What is the main clinical advantage of this extended recording period compared to a standard resting 12-lead EKG?

It eliminates baseline artifact caused by patient movement
It provides higher voltage sensitivity for detecting bundle branch blocks
It captures intermittent arrhythmias that may not occur during a brief office visit (Correct answer)
It measures beat-to-beat blood pressure changes alongside rhythm

Correct answer: It captures intermittent arrhythmias that may not occur during a brief office visit

Many arrhythmias — such as paroxysmal atrial fibrillation or nonsustained ventricular tachycardia — occur sporadically. A 24–48 hour Holter recording vastly increases the chance of capturing these transient events that a short resting EKG would miss.

Question 38: What is the correct action if the ground wire on a three-prong EKG power plug is missing or broken?

Continue using but document the issue
Use an adapter to convert to a two-prong plug
Remove the machine from service until repaired (Correct answer)
Wrap the cord with electrical tape

Correct answer: Remove the machine from service until repaired

A missing ground wire eliminates the safety path for stray current, making the equipment unsafe and requiring immediate removal from service.

Question 39: What is the target heart rate formula most commonly used to determine adequate stress during an exercise stress test?

220 minus the patient's age (Correct answer)
250 minus half the patient's age
180 minus the patient's resting heart rate
200 minus the patient's age

Correct answer: 220 minus the patient's age

The age-predicted maximum heart rate is calculated as 220 minus age, and the target is typically 85% of this value for a diagnostic test.

Question 40: How does Electrode Placement & Lead Systems contribute to patient safety?

It only applies to theoretical knowledge.
It has no impact on patient safety.
It helps identify potential risks and ensures accurate treatment. (Correct answer)
It is only necessary for physical tasks.

Correct answer: It helps identify potential risks and ensures accurate treatment.

By providing accurate and reliable EKG data, correct electrode placement enables healthcare providers to precisely identify underlying cardiac issues and potential risks, such as life-threatening arrhythmias or signs of a heart attack. This early and accurate identification allows for timely and appropriate treatment interventions, preventing adverse events and significantly enhancing patient safety. Misplaced electrodes can obscure critical findings, leading to delayed or incorrect treatment.

Question 41: Which of the following BEST describes why single-use EKG electrodes should never be repositioned and reapplied to a different site on the same patient?

The conductive gel dries out instantly, making repositioning unsafe electrically
Regulatory agencies prohibit repositioning electrodes under any circumstances
Single-use electrodes are too expensive to waste by moving them
The adhesive picks up skin flora and debris, increasing infection risk at the new site (Correct answer)

Correct answer: The adhesive picks up skin flora and debris, increasing infection risk at the new site

Once a single-use electrode is removed, its adhesive surface carries skin bacteria and cellular debris. Reapplying it transfers that contamination to a new skin site, raising the risk of localized skin infection, especially in immunocompromised patients.

Question 42: A patient presents with an irregularly irregular rhythm with no discernible P waves on EKG. What is the most likely diagnosis?

Sinus arrhythmia
Atrial flutter
Multifocal atrial tachycardia
Atrial fibrillation (Correct answer)

Correct answer: Atrial fibrillation

Atrial fibrillation is characterized by an irregularly irregular rhythm with fibrillatory baseline and absence of organized P waves.

Question 43: What rhythm is indicated by a saw-tooth pattern of P waves at approximately 300 bpm with a regular ventricular rate?

Atrial fibrillation
Ventricular flutter
Atrial flutter (Correct answer)
Supraventricular tachycardia

Correct answer: Atrial flutter

Atrial flutter produces characteristic saw-tooth flutter waves at about 300 bpm, typically with a 2:1 conduction ratio giving a ventricular rate near 150 bpm.

Question 44: Why is EKG Interpretation & Waveforms critical for early detection of heart conditions?

It has limited use in cardiac care.
It only helps with emergency diagnosis.
It is only necessary when symptoms are severe.
It plays a vital role in detecting heart conditions early, which improves treatment outcomes. (Correct answer)

Correct answer: It plays a vital role in detecting heart conditions early, which improves treatment outcomes.

EKG interpretation is critical for the early detection of heart conditions because it can reveal subtle electrical abnormalities before severe symptoms appear. Early identification allows for prompt medical intervention, which can significantly improve treatment outcomes and prevent the progression of disease. This proactive approach is vital for better patient prognosis and managing cardiac health effectively.

Question 45: The T wave on an EKG tracing corresponds to which electrical event in the heart?

Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization (Correct answer)

Correct answer: Ventricular repolarization

The T wave represents ventricular repolarization, the recovery phase during which the ventricles reset their electrical charge for the next contraction.

Question 46: A wandering baseline artifact on an EKG is most likely caused by:

Improper machine calibration
60 Hz electrical interference
Incorrect lead placement
Electrode movement or poor skin preparation (Correct answer)

Correct answer: Electrode movement or poor skin preparation

Wandering baseline is most often caused by electrode movement, poor adhesion, or inadequate skin preparation such as not cleaning the electrode site.

Question 47: Which of these represents a key step in the cardiac cycle?

Inflow
Ejection
All of these (Correct answer)
Isovolumic relaxation

Correct answer: All of these

The cardiac cycle encompasses all the events that occur during one complete heartbeat, ensuring efficient blood pumping. Key steps include inflow (ventricular filling), isovolumic contraction (ventricles contract without changing volume), ejection (blood is pumped out), and isovolumic relaxation (ventricles relax without changing volume). Therefore, all the listed options are integral parts of the cardiac cycle.

Question 48: In a properly functioning EKG machine, the standardization mark at the beginning of each lead should measure:

15 mm tall and 0.4 sec wide
20 mm tall and 0.2 sec wide
5 mm tall and 0.1 sec wide
10 mm tall and 0.2 sec wide (Correct answer)

Correct answer: 10 mm tall and 0.2 sec wide

The standard calibration pulse should be 10 mm (1 mV) tall and 0.2 seconds wide, confirming the machine is properly calibrated.

Question 49: What does the term 'stat EKG' mean in a clinical setting?

An EKG performed only during scheduled outpatient hours
An EKG that must be performed and interpreted immediately due to clinical urgency (Correct answer)
A scheduled routine EKG with 24-hour turnaround
A series of EKGs performed over 48 hours

Correct answer: An EKG that must be performed and interpreted immediately due to clinical urgency

'Stat' (from the Latin 'statim' meaning immediately) designates the EKG as a medical priority requiring immediate performance and rapid reporting to the clinical team.

Question 50: How does Heart Rate & Rhythm Analysis affect the diagnosis of heart conditions?

It is used solely for monitoring heart rate.
It only applies to diagnosing respiratory issues.
It has no role in diagnosing heart conditions.
It plays a significant role in identifying abnormal heart rhythms and other cardiac conditions. (Correct answer)

Correct answer: It plays a significant role in identifying abnormal heart rhythms and other cardiac conditions.

Analyzing heart rate and rhythm is a primary method for diagnosing a wide range of heart conditions. Deviations from normal rates (tachycardia, bradycardia) or irregular rhythms (arrhythmias) are key indicators of underlying cardiac issues, such as conduction defects, myocardial ischemia, or structural heart disease. This analysis provides the foundational information for a precise diagnosis, guiding subsequent medical interventions.

Question 51: What is the correct limb electrode placement for a standard 12-lead EKG?

RA on left arm, LA on right arm, RL on left leg, LL on right leg
RA on right leg, LA on left arm, RL on right arm, LL on left leg
RA on right arm, LA on left arm, RL on right leg, LL on left leg (Correct answer)
RA on right arm, LA on left leg, RL on right leg, LL on left arm

Correct answer: RA on right arm, LA on left arm, RL on right leg, LL on left leg

Standard placement uses RA on the right arm, LA on the left arm, RL on the right leg, and LL on the left leg.

Question 52: A patient's EKG reveals a wide QRS complex (>120 ms) with an RSR' pattern in lead V1 and a wide S wave in leads I and V6. What is the most likely diagnosis?

Ventricular tachycardia
Left bundle branch block
Right bundle branch block (Correct answer)
Wolff-Parkinson-White syndrome

Correct answer: Right bundle branch block

An RSR' pattern in V1 with a wide S wave in leads I and V6 and QRS duration greater than 120 ms is the classic presentation of right bundle branch block.

Question 53: A patient on digoxin therapy has an EKG showing a downsloping ST depression described as 'scooped' or 'Salvador Dali moustache' morphology. What does this finding represent?

Third-degree AV block
Acute anterolateral STEMI
Digoxin effect (digitalis effect) (Correct answer)
Hypokalemia-induced T-wave changes

Correct answer: Digoxin effect (digitalis effect)

The characteristic downsloping, scooped ST-segment depression — often compared to a Salvador Dali moustache — is a classic EKG manifestation of digoxin effect (not toxicity). It reflects altered ventricular repolarization caused by the drug's action and does not necessarily indicate toxicity or ischemia.

Question 54: What is the standard paper speed used for a resting 12-lead EKG in the United States?

10 mm/sec
50 mm/sec
15 mm/sec
25 mm/sec (Correct answer)

Correct answer: 25 mm/sec

The standard paper speed for a resting 12-lead EKG in the US is 25 mm/sec, making each small box equal to 0.04 seconds.

Question 55: Which precordial lead is positioned at the fourth intercostal space to the right of the sternum?

V2
V3
V4
V1 (Correct answer)

Correct answer: V1

V1 is placed at the fourth intercostal space at the right sternal border.

Question 56: A patient wearing a Holter monitor reports feeling palpitations at 3:15 PM but the diary entry is missing. What feature of the Holter system helps correlate symptoms?

Built-in pulse oximetry
The event marker button pressed by the patient (Correct answer)
Automatic blood pressure readings
Physician remote access alerts

Correct answer: The event marker button pressed by the patient

The event marker button allows patients to flag the exact time they experience symptoms, enabling correlation with the recorded rhythm strip.

Question 57: What is the primary advantage of an event monitor over a standard 24-hour Holter monitor?

It automatically delivers therapy for detected arrhythmias
It provides continuous 12-lead monitoring
It can record over weeks to capture infrequent symptoms (Correct answer)
It measures cardiac output during recording

Correct answer: It can record over weeks to capture infrequent symptoms

Event monitors can be worn for weeks or months, making them ideal for capturing arrhythmias that occur too infrequently to be caught in a 24-hour Holter recording.

Question 58: Why is documentation important in Electrode Placement & Lead Systems?

It is only used for billing purposes.
It is irrelevant to patient care.
It provides a legal and medical record of diagnostic results. (Correct answer)
It is not necessary unless requested.

Correct answer: It provides a legal and medical record of diagnostic results.

Documentation of electrode placement and lead systems is crucial as it creates a permanent legal and medical record of the diagnostic procedure and its findings. This record ensures continuity of care, allows for comparison with previous EKGs, and serves as a vital reference for future treatment decisions. It also protects healthcare providers by demonstrating adherence to protocols and proper diagnostic practices, contributing to accountability and quality assurance.

Question 59: On a rhythm strip, you observe a wide-complex tachycardia at 180 bpm with AV dissociation. What is the most likely interpretation?

SVT with aberrant conduction
Ventricular tachycardia (Correct answer)
Atrial flutter with bundle branch block
Wolff-Parkinson-White syndrome

Correct answer: Ventricular tachycardia

AV dissociation in the setting of a wide-complex tachycardia is highly indicative of ventricular tachycardia.

Question 60: What is the normal duration of the QRS complex in a healthy adult?

0.12 to 0.16 seconds
0.06 to 0.10 seconds (Correct answer)
0.20 to 0.24 seconds
Less than 0.04 seconds

Correct answer: 0.06 to 0.10 seconds

The normal QRS duration is 0.06 to 0.10 seconds, indicating rapid and synchronized ventricular depolarization.

Question 61: What stands for the QRS complex?

The depolarization of ventricles (Correct answer)
The depolarization of atria
Septal depolarization
AV depolarization

Correct answer: The depolarization of ventricles

The QRS complex is the most prominent waveform on an EKG and represents the rapid depolarization of the ventricles. This electrical event triggers ventricular contraction, which is responsible for pumping blood out of the heart to the body and lungs. It is a key indicator of ventricular function.

Question 62: Before placing EKG electrodes, a technician should prepare the skin by:

Applying a thick layer of lotion to the skin
Lightly abrading and cleaning the skin with an alcohol wipe (Correct answer)
Applying warm water only
Shaving the entire chest regardless of hair

Correct answer: Lightly abrading and cleaning the skin with an alcohol wipe

Cleaning the skin with an alcohol wipe and lightly abrading it removes oils, dead skin cells, and moisture that increase electrode impedance.

Question 63: ST elevation in leads II, III, and aVF most likely indicates ischemia in which coronary artery territory?

Left main coronary artery
Right coronary artery (Correct answer)
Left anterior descending artery
Left circumflex artery

Correct answer: Right coronary artery

Leads II, III, and aVF reflect the inferior wall of the heart, which is most commonly supplied by the right coronary artery.

Question 64: Where is the V6 electrode correctly placed during a 12-lead EKG?

Midaxillary line at the fifth intercostal space (Correct answer)
Posterior axillary line at the fourth intercostal space
Midclavicular line at the fifth intercostal space
Anterior axillary line at the fifth intercostal space

Correct answer: Midaxillary line at the fifth intercostal space

V6 is placed at the midaxillary line, level with V4 and V5 horizontally. This position captures electrical activity from the lateral left ventricular wall.

Question 65: How does Safety & Infection Control Protocols contribute to patient safety?

It only applies to theoretical knowledge.
It has no impact on patient safety.
It is only necessary for physical tasks.
It helps identify potential risks and ensures accurate treatment. (Correct answer)

Correct answer: It helps identify potential risks and ensures accurate treatment.

Safety & Infection Control Protocols directly contribute to patient safety by minimizing the risk of harm, such as infections or equipment-related incidents, during EKG procedures. By establishing clear guidelines for hygiene, equipment handling, and emergency response, these protocols create a secure environment. This allows for reliable diagnostic testing, which then informs accurate treatment decisions, further safeguarding the patient's well-being.

Question 66: An ECG strip shows a rhythm where P waves are present but bear no consistent relationship to QRS complexes, and the ventricular rate is slower than the atrial rate. What rhythm does this represent?

Junctional tachycardia
Accelerated idioventricular rhythm
Third-degree (complete) AV block (Correct answer)
Second-degree AV block, Mobitz Type II

Correct answer: Third-degree (complete) AV block

In third-degree (complete) AV block, the atria and ventricles beat independently because no impulses conduct through the AV node. P waves and QRS complexes are dissociated, and the ventricular rate is slower as it is driven by an escape pacemaker below the block.

Question 67: Where should right-sided chest leads (V3R-V6R) be placed to evaluate a suspected right ventricular infarction?

Mirror positions of V3-V6 on the right side of the chest (Correct answer)
Directly over the right sternal border at sequential intercostal spaces
Along the right midaxillary line from the third to sixth intercostal space
Same positions as V3-V6 but one intercostal space higher

Correct answer: Mirror positions of V3-V6 on the right side of the chest

Right-sided leads are placed in mirror-image positions of the standard left-sided V3 through V6 on the right chest wall.

Question 68: How does Stress Testing & Holter Monitoring affect the diagnosis of heart conditions?

It only applies to diagnosing respiratory issues.
It is used solely for monitoring heart rate.
It has no role in diagnosing heart conditions.
It plays a significant role in identifying abnormal heart rhythms and other cardiac conditions. (Correct answer)

Correct answer: It plays a significant role in identifying abnormal heart rhythms and other cardiac conditions.

Stress Testing and Holter Monitoring play a significant role in diagnosing heart conditions by revealing abnormalities that are not apparent during a standard, resting EKG. These tests can identify exercise-induced ischemia, transient arrhythmias, or other cardiac issues that occur intermittently. This detailed information is invaluable for making precise diagnoses and understanding the full scope of a patient's cardiac health.

Question 69: What does the term 'lead reversal' mean in the context of a 12-lead EKG?

The paper speed is reversed
The machine is printing leads in the wrong order
Electrodes have been placed on incorrect body sites (Correct answer)
The sensitivity is inverted

Correct answer: Electrodes have been placed on incorrect body sites

Lead reversal occurs when electrodes are attached to the wrong limbs or precordial positions, producing inaccurate or mirror-image tracings.

Question 70: A patient's EKG shows a regular rhythm with a rate of 150 bpm, narrow QRS complexes, and no visible P waves. What is the most likely rhythm?

Sinus tachycardia
Supraventricular tachycardia (Correct answer)
Ventricular tachycardia
Atrial fibrillation

Correct answer: Supraventricular tachycardia

SVT typically presents with a regular narrow-complex tachycardia around 150 bpm with P waves buried in the QRS or T waves.

Question 71: An EKG shows a completely chaotic baseline with no identifiable P waves, QRS complexes, or T waves, and no measurable rate. What rhythm is this?

Asystole
Ventricular tachycardia
Ventricular fibrillation (Correct answer)
Atrial fibrillation

Correct answer: Ventricular fibrillation

Ventricular fibrillation presents as a chaotic, disorganized waveform with no discernible P waves, QRS complexes, or T waves and no calculable heart rate.

Question 72: Why must EKG machines be plugged into hospital-grade (green dot) outlets rather than standard outlets?

They filter electromagnetic interference
They are closer to the patient bed
Hospital-grade outlets have stricter grounding and retention standards (Correct answer)
They provide higher voltage for medical equipment

Correct answer: Hospital-grade outlets have stricter grounding and retention standards

Hospital-grade outlets meet UL 1449 standards with enhanced grounding integrity and plug retention, reducing shock risk in patient care areas.

Question 73: A patient presents with chest pain and the EKG shows ST elevation in leads II, III, and aVF with reciprocal ST depression in leads I and aVL. Which type of myocardial infarction does this indicate?

Lateral MI
Inferior MI (Correct answer)
Anterior MI
Posterior MI

Correct answer: Inferior MI

Leads II, III, and aVF reflect the inferior surface of the heart, and ST elevation in these leads with reciprocal changes confirms an inferior MI.

Question 74: When should an EKG technician replace disposable electrodes during a patient visit?

If the electrode loses adhesion or the gel dries out before recording (Correct answer)
Only if the patient requests it
Electrodes should never be replaced mid-session
After every 30 minutes of monitoring

Correct answer: If the electrode loses adhesion or the gel dries out before recording

Electrodes should be replaced if they lose adhesion or dry out, as poor electrode-skin contact leads to artifact and inaccurate recordings.

Question 75: Which lead do you think a BIPHASIC P wave would be in?

V3
V5-V6
V2-V3
V1 (Correct answer)

Correct answer: V1

A biphasic P wave, characterized by both an upward and a downward deflection, is most commonly observed in lead V1. This occurs because V1 is positioned over the right atrium, and the electrical impulse first moves towards V1 (positive deflection from right atrial depolarization) and then away from V1 (negative deflection from left atrial depolarization).

Question 76: What is the minimum recommended frequency for biomedical inspection of EKG equipment in a clinical setting?

Annually (Correct answer)
Monthly
Every five years
Only when visibly damaged

Correct answer: Annually

Most facility protocols and Joint Commission standards require annual biomedical safety inspections of patient-care electrical equipment.

Question 77: Which statement about disposable EKG electrodes is correct?

They can be reused on the same patient if removed carefully
They do not require skin preparation before placement
They should be stored in a warm environment to extend shelf life
They contain a conductive gel that maintains good skin contact (Correct answer)

Correct answer: They contain a conductive gel that maintains good skin contact

Disposable EKG electrodes contain a conductive gel that reduces skin-electrode impedance and ensures good electrical contact for accurate signal acquisition.

Question 78: A patient presents with a sudden-onset regular tachycardia at 170 bpm. The EKG shows narrow QRS complexes and retrograde P waves buried in or just after the QRS. Vagal maneuvers terminate the rhythm abruptly. What is the most likely diagnosis?

Atrial flutter
Accelerated junctional rhythm
Atrioventricular nodal reentrant tachycardia (AVNRT) (Correct answer)
Multifocal atrial tachycardia

Correct answer: Atrioventricular nodal reentrant tachycardia (AVNRT)

AVNRT is the most common paroxysmal supraventricular tachycardia (SVT). It results from a reentrant circuit within the AV node, producing a regular narrow-complex tachycardia with retrograde P waves very close to or hidden within the QRS. It characteristically terminates with vagal maneuvers or adenosine.

Question 79: What is the primary purpose of the right leg (RL) electrode in a standard 12-lead EKG?

It records right ventricular electrical activity
It serves as a ground reference to reduce electrical interference (Correct answer)
It acts as the negative pole for Lead III
It provides augmented voltage data for aVF

Correct answer: It serves as a ground reference to reduce electrical interference

The right leg electrode functions as an electrical ground to minimize noise and artifact on the tracing.

Question 80: What is the importance of EKG Interpretation & Waveforms in EKG certification?

It is crucial for understanding the heart's electrical activity and ensuring accurate results. (Correct answer)
It has no impact on patient outcomes.
It only applies to advanced medical procedures.
It is irrelevant for proper diagnosis.

Correct answer: It is crucial for understanding the heart's electrical activity and ensuring accurate results.

EKG interpretation and waveform analysis are fundamental to understanding the heart's electrical activity. This crucial skill allows medical professionals to accurately read and make sense of the complex patterns on an EKG tracing. Without proper interpretation, the EKG results cannot be effectively used for diagnosis or patient management, making it essential for accurate results.

Question 81: What does a prolonged PR interval greater than 200 ms on an EKG indicate?

Bundle branch block
Wolff-Parkinson-White syndrome
First-degree AV block (Correct answer)
Second-degree AV block Type II

Correct answer: First-degree AV block

A PR interval consistently greater than 200 ms with every P wave followed by a QRS complex defines first-degree AV block.

Question 82: A patient's EKG shows ST-segment elevation in leads V1–V4 with reciprocal ST depression in leads II, III, and aVF. Which area of the myocardium is MOST likely affected?

Posterior wall
Inferior wall
Lateral wall
Anterior wall (Correct answer)

Correct answer: Anterior wall

Leads V1–V4 are the precordial leads that directly overlie the anterior wall of the left ventricle. ST elevation in these leads with reciprocal changes inferiorly is the classic pattern of an anterior STEMI, typically from LAD occlusion.

Question 83: Which of the subsequent qualifies as a negative Holter:

Pauses
No significant arrhythmias or ST changes (Correct answer)
ST elevation or Depression
Bradycardias and tachycardias

Correct answer: No significant arrhythmias or ST changes

A 'negative' Holter monitor result indicates that no significant cardiac abnormalities were detected during the monitoring period. This means there were no clinically significant arrhythmias, such as dangerous bradycardias, tachycardias, or pauses, nor any ischemic ST segment changes (elevation or depression). A negative result suggests that the patient's symptoms are likely not due to these specific cardiac electrical issues.

Question 84: Where is the sinoatrial node located?

Inter ventricular septum
Right ventricle
Purkinje fiber
Right atrium (Correct answer)

Correct answer: Right atrium

The sinoatrial (SA) node, often called the heart's natural pacemaker, is located in the upper posterior wall of the right atrium. It spontaneously generates electrical impulses that initiate each heartbeat, setting the rhythm for the entire heart. From the SA node, these impulses spread across the atria, causing them to contract.

Question 85: Which group of leads on a 12-lead EKG is best used to detect ischemia or injury to the anterior wall of the left ventricle?

V1, V2, V3, and V4 (Correct answer)
aVR and V1
II, III, and aVF
I, aVL, V5, and V6

Correct answer: V1, V2, V3, and V4

Leads V1 through V4 overlie the anterior surface of the heart and are therefore the primary leads for detecting anterior wall ischemia, injury, or infarction. Changes such as ST elevation or T-wave inversion in these leads point to anterior wall involvement.

Question 86: What is the AOO pacemaker mode?

Atrium sensed, ventricle paced, inhibited
Atrium and ventricle paced, no sensing
Atrium paced, no sensing, asynchronous (fixed-rate) pacing (Correct answer)
Atrium paced, atrium sensed, output inhibited

Correct answer: Atrium paced, no sensing, asynchronous (fixed-rate) pacing

AOO is asynchronous atrial pacing: the atrium is paced at a fixed rate with no sensing function; this mode ignores any native cardiac activity and paces regardless.

Question 87: On a standard ECG paper running at 25 mm/second, how much time does one large (5 mm) square represent?

0.04 seconds
0.20 seconds (Correct answer)
0.40 seconds
0.10 seconds

Correct answer: 0.20 seconds

At 25 mm/second, each small 1 mm square represents 0.04 seconds and each large 5 mm square (containing 5 small squares) represents 0.20 seconds. This is foundational knowledge for measuring intervals and calculating heart rate.

Question 88: Why is Safety & Infection Control Protocols essential for EKG technicians?

It is irrelevant to the EKG testing process.
It ensures accurate EKG readings and proper diagnosis of heart conditions. (Correct answer)
It is only used for educational purposes.
It is only relevant for cardiologists.

Correct answer: It ensures accurate EKG readings and proper diagnosis of heart conditions.

For EKG technicians, strict adherence to Safety & Infection Control Protocols is essential to protect both patients and themselves from harm. By following these guidelines, technicians ensure a clean and safe testing environment, which is crucial for obtaining accurate EKG readings free from contamination or interference. This accuracy is fundamental for physicians to make proper diagnoses of heart conditions and guide effective patient care.

Question 89: How should a technician handle a patient who is extremely anxious about the EKG procedure?

Ask the patient to sign a waiver
Explain the procedure calmly, reassure the patient it is painless, and answer questions (Correct answer)
Reschedule the test for another day
Proceed quickly without explanation to reduce wait time

Correct answer: Explain the procedure calmly, reassure the patient it is painless, and answer questions

Calm explanation and reassurance reduce patient anxiety, promote cooperation, and decrease the likelihood of somatic tremor artifact from tensed muscles.

Question 90: Why is Safety & Infection Control Protocols critical for early detection of heart conditions?

It plays a vital role in detecting heart conditions early, which improves treatment outcomes. (Correct answer)
It is only necessary when symptoms are severe.
It only helps with emergency diagnosis.
It has limited use in cardiac care.

Correct answer: It plays a vital role in detecting heart conditions early, which improves treatment outcomes.

Safety & Infection Control Protocols are critical because they ensure a sterile and safe environment for performing diagnostic tests like EKGs. By preventing complications and maintaining equipment integrity, these protocols allow for accurate and uninterrupted data collection. This reliability is fundamental for the early and precise detection of heart conditions, which in turn enables timely interventions and significantly improves patient treatment outcomes.

Question 91: When performing a 12-lead EKG on a pediatric patient, which adaptation is most appropriate?

Use double standard sensitivity for all leads
Skip the precordial leads to reduce patient stress
Use adult-sized electrodes to ensure better contact
Use smaller pediatric electrodes to fit the smaller chest and limb size (Correct answer)

Correct answer: Use smaller pediatric electrodes to fit the smaller chest and limb size

Pediatric patients require smaller electrodes designed for their body size to ensure proper electrode-to-skin contact and accurate waveform capture.

Question 92: Which of the following describes depolarization of the ventricular muscle?

QRS complex (Correct answer)
PR interval
P wave
T wave

Correct answer: QRS complex

The QRS complex on an ECG represents the rapid electrical depolarization of the ventricles. This significant electrical event immediately precedes and triggers the contraction of the ventricular muscle. Ventricular contraction is essential for pumping blood out of the heart to the lungs and the rest of the body.

Question 93: After completing a 12-lead EKG, how should the technician dispose of used single-use electrodes?

Dispose of them in a standard medical waste (biohazard) container or regular trash per facility policy (Correct answer)
Leave them at the bedside for nursing staff to handle
Rinse and store them for reuse on another patient
Place them in a sharps container

Correct answer: Dispose of them in a standard medical waste (biohazard) container or regular trash per facility policy

Single-use electrodes are considered medical waste; disposal follows facility and local regulations, typically in standard waste or biohazard bags depending on blood/body fluid exposure.

Question 94: Which EKG lead placement configuration is most commonly used in a standard Holter monitor setup?

Modified 5-lead or 7-lead chest configuration (Correct answer)
15-lead augmented configuration
Single-lead rhythm strip
Standard 12-lead limb placement

Correct answer: Modified 5-lead or 7-lead chest configuration

Holter monitors typically use a modified 5-lead or 7-lead configuration attached to the chest to approximate standard EKG views while allowing patient mobility.

Question 95: How does Stress Testing & Holter Monitoring contribute to patient safety?

It only applies to theoretical knowledge.
It is only necessary for physical tasks.
It has no impact on patient safety.
It helps identify potential risks and ensures accurate treatment. (Correct answer)

Correct answer: It helps identify potential risks and ensures accurate treatment.

Stress Testing and Holter Monitoring contribute to patient safety by identifying potential cardiac risks that might otherwise go undetected. By revealing how the heart responds to stress or capturing dangerous intermittent arrhythmias, these tests allow healthcare providers to implement preventative measures. This ensures that treatment plans are accurately tailored to minimize adverse events and enhance patient safety.

Question 96: How does Stress Testing & Holter Monitoring affect patient outcomes?

It only affects short-term health outcomes.
It only impacts physical health.
It has a long-term impact on improving heart health and preventing complications. (Correct answer)
It is irrelevant to long-term health outcomes.

Correct answer: It has a long-term impact on improving heart health and preventing complications.

By providing comprehensive data on cardiac function under various conditions, Stress Testing and Holter Monitoring enable precise diagnosis and tailored management plans. This proactive approach helps prevent the progression of heart disease and reduces the risk of future cardiac events. Ultimately, it leads to better long-term heart health and an improved quality of life for patients.

Question 97: Which electrolyte imbalance is most commonly associated with tall, peaked T waves on an ECG?

Hyperkalemia (Correct answer)
Hypokalemia
Hyponatremia
Hypercalcemia

Correct answer: Hyperkalemia

Hyperkalemia classically produces tall, narrow, peaked T waves as one of its earliest ECG manifestations.

Question 98: An EKG cable set has visible dried secretions on it after use. What is the correct next step?

Rinse the cables under running water and immediately reuse them
Discard the cables as biohazardous waste
Wipe with a facility-approved disinfectant wipe and allow full contact time before reuse (Correct answer)
Place the cables in an autoclave for sterilization

Correct answer: Wipe with a facility-approved disinfectant wipe and allow full contact time before reuse

Reusable EKG cables must be cleaned with an EPA-registered, facility-approved disinfectant and allowed the full recommended contact (dwell) time to inactivate pathogens. Autoclaving damages the cables, and discarding reusable equipment is unnecessary if proper disinfection is performed.

Question 99: A technician places the right leg electrode during a 12-lead EKG. What is the primary function of this electrode?

It creates the reference point for aVF
It serves as the positive pole for Lead II
It records the inferior wall of the heart
It acts as an electrical ground to reduce interference (Correct answer)

Correct answer: It acts as an electrical ground to reduce interference

The right leg (RL) electrode serves as the electrical ground for the entire recording. It does not contribute to any of the 12 leads but helps minimize electrical interference and artifact in the tracing.

Question 100: What is the significance of a pacemaker lead impedance that has dropped suddenly to below 200 ohms?

Normal variation within acceptable range
Lead dislodgment from the endocardium
Possible lead insulation break or short circuit (Correct answer)
Battery depletion approaching end-of-life

Correct answer: Possible lead insulation break or short circuit

A sudden drop in lead impedance below 200 ohms suggests an insulation breach or short circuit in the pacing lead, which can cause inappropriate pacing behavior or failure.

Certified EKG Technician (CET) Exam

The Certified EKG Technician (CET) exam, offered by the NHA, validates a healthcare professional's knowledge and skills in performing electrocardiograms.

100

Questions

120 min

Time Limit

70%

To Pass

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