150 questions and correct answers for the
Relias Dysrhythmia Basic . including ECG
interpretation, arrhythmia identification, and
basic clinical management principles for the
2025/2026 period.
Basic ECG Interpretation (Questions 1-20)
1. What are the primary components of an ECG waveform?
A. P wave, PR interval, QRS complex, ST segment, T wave, and QT interval.
Correct Answer: A. P wave, PR interval, QRS complex, ST segment, T wave, and QT interval.
2. The P wave on an ECG represents what cardiac event?
A. Ventricular repolarization
B. Atrial depolarization
C. Ventricular depolarization
D. The delay at the AV node
Correct Answer: B. Atrial depolarization.
3. What is the normal duration of the PR interval?
A. 0.04 - 0.10 seconds
B. 0.12 - 0.20 seconds
C. 0.20 - 0.30 seconds
D. < 0.12 seconds
Correct Answer: B. 0.12 - 0.20 seconds.
,4. The QRS complex represents:
A. Atrial depolarization
B. AV nodal conduction
C. Ventricular depolarization
D. Ventricular repolarization
Correct Answer: C. Ventricular depolarization.
5. What is the normal duration of a QRS complex?
A. 0.04 - 0.10 seconds
B. 0.12 - 0.20 seconds
C. 0.20 - 0.30 seconds
D. > 0.12 seconds
Correct Answer: A. 0.04 - 0.10 seconds.
6. How is the ventricular rate calculated on a regular rhythm strip?
A. Count the number of large boxes between two R waves and divide by 300.
B. Count the number of small boxes between two R waves and divide by 1500.
C. Count the number of R waves in a 6-second strip and multiply by 10.
D. Both A and B are correct.
Correct Answer: D. Both A and B are correct.
7. How is the heart rate determined if the rhythm is irregular?
A. The 300 method.
B. The 1500 method.
C. Count the number of R waves in a 6-second strip and multiply by 10.
D. Measure the PR interval.
Correct Answer: C. Count the number of R waves in a 6-second strip and multiply by 10.
8. The T wave represents:
, A. Atrial depolarization
B. AV nodal conduction
C. Ventricular depolarization
D. Ventricular repolarization
Correct Answer: D. Ventricular repolarization.
9. What is the normal resting heart rate for a healthy adult?
A. 40-60 bpm
B. 60-100 bpm
C. 100-150 bpm
D. >150 bpm
Correct Answer: B. 60-100 bpm.
10. Which of the following is NOT a standard lead for continuous telemetry monitoring?
A. Lead II
B. Lead V1
C. Lead MCL1
D. Lead III
Correct Answer: B. Lead V1 is a precordial lead used for a 12-lead ECG, not typically for continuous
telemetry.
11. A U wave is most commonly associated with which electrolyte imbalance?
A. Hyperkalemia
B. Hypokalemia
C. Hypercalcemia
D. Hypomagnesemia
Correct Answer: B. Hypokalemia.
12. The ST segment represents what phase of the cardiac cycle?
Relias Dysrhythmia Basic . including ECG
interpretation, arrhythmia identification, and
basic clinical management principles for the
2025/2026 period.
Basic ECG Interpretation (Questions 1-20)
1. What are the primary components of an ECG waveform?
A. P wave, PR interval, QRS complex, ST segment, T wave, and QT interval.
Correct Answer: A. P wave, PR interval, QRS complex, ST segment, T wave, and QT interval.
2. The P wave on an ECG represents what cardiac event?
A. Ventricular repolarization
B. Atrial depolarization
C. Ventricular depolarization
D. The delay at the AV node
Correct Answer: B. Atrial depolarization.
3. What is the normal duration of the PR interval?
A. 0.04 - 0.10 seconds
B. 0.12 - 0.20 seconds
C. 0.20 - 0.30 seconds
D. < 0.12 seconds
Correct Answer: B. 0.12 - 0.20 seconds.
,4. The QRS complex represents:
A. Atrial depolarization
B. AV nodal conduction
C. Ventricular depolarization
D. Ventricular repolarization
Correct Answer: C. Ventricular depolarization.
5. What is the normal duration of a QRS complex?
A. 0.04 - 0.10 seconds
B. 0.12 - 0.20 seconds
C. 0.20 - 0.30 seconds
D. > 0.12 seconds
Correct Answer: A. 0.04 - 0.10 seconds.
6. How is the ventricular rate calculated on a regular rhythm strip?
A. Count the number of large boxes between two R waves and divide by 300.
B. Count the number of small boxes between two R waves and divide by 1500.
C. Count the number of R waves in a 6-second strip and multiply by 10.
D. Both A and B are correct.
Correct Answer: D. Both A and B are correct.
7. How is the heart rate determined if the rhythm is irregular?
A. The 300 method.
B. The 1500 method.
C. Count the number of R waves in a 6-second strip and multiply by 10.
D. Measure the PR interval.
Correct Answer: C. Count the number of R waves in a 6-second strip and multiply by 10.
8. The T wave represents:
, A. Atrial depolarization
B. AV nodal conduction
C. Ventricular depolarization
D. Ventricular repolarization
Correct Answer: D. Ventricular repolarization.
9. What is the normal resting heart rate for a healthy adult?
A. 40-60 bpm
B. 60-100 bpm
C. 100-150 bpm
D. >150 bpm
Correct Answer: B. 60-100 bpm.
10. Which of the following is NOT a standard lead for continuous telemetry monitoring?
A. Lead II
B. Lead V1
C. Lead MCL1
D. Lead III
Correct Answer: B. Lead V1 is a precordial lead used for a 12-lead ECG, not typically for continuous
telemetry.
11. A U wave is most commonly associated with which electrolyte imbalance?
A. Hyperkalemia
B. Hypokalemia
C. Hypercalcemia
D. Hypomagnesemia
Correct Answer: B. Hypokalemia.
12. The ST segment represents what phase of the cardiac cycle?
