Relias Dysrhythmia Basic Test Bank A & B 150-Question Complete Practice Exam | 2025/2026 Edition | Questions and Correct Answers

Relias Dysrhythmia Basic Test Bank A & B
150-Question Complete Practice Exam |
2025/2026 Edition | Questions and Correct
Answers
Section I: ECG Fundamentals and Waveforms (1–25)
1. What does the P wave represent on an ECG tracing?
A. Ventricular depolarization
B. Atrial depolarization
C. Ventricular repolarization
D. Atrial repolarization

Correct Answer: B
Rationale: The P wave represents atrial depolarization, which leads to atrial contraction.


2. What does the QRS complex represent on an ECG tracing?
A. Atrial depolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial repolarization

Correct Answer: B
Rationale: The QRS complex represents ventricular depolarization.


3. What does the T wave represent on an ECG tracing?
A. Atrial depolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial repolarization

Correct Answer: C
Rationale: The T wave represents ventricular repolarization.

,4. 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. 0.30–0.40 seconds

Correct Answer: B
Rationale: The normal PR interval is 0.12–0.20 seconds (3–5 small boxes).


5. What is the normal duration of the QRS complex?
A. Less than 0.12 seconds
B. 0.12–0.20 seconds
C. 0.20–0.30 seconds
D. More than 0.30 seconds

Correct Answer: A
Rationale: A normal QRS complex is less than 0.12 seconds (less than 3 small boxes).


6. How many small boxes on ECG paper equal 1 second?
A. 5
B. 10
C. 15
D. 25

Correct Answer: D
Rationale: 25 small boxes equal 1 second; 5 large boxes equal 1 second.


7. How many large boxes on ECG paper equal 1 minute?
A. 30
B. 60
C. 150
D. 300

Correct Answer: D
Rationale: 300 large boxes equal 1 minute; heart rate can be calculated as 300 divided by
the number of large boxes between R waves.

,8. What is the normal heart rate range for sinus rhythm?
A. 40–60 bpm
B. 60–100 bpm
C. 100–120 bpm
D. 120–150 bpm

Correct Answer: B
Rationale: Normal sinus rhythm has a rate of 60–100 beats per minute.


9. Which node is the primary pacemaker of the heart?
A. AV node
B. SA node
C. Bundle of His
D. Purkinje fibers

Correct Answer: B
Rationale: The SA node is the primary pacemaker, firing at 60–100 bpm.


10. What is the intrinsic rate of the AV node?
A. 60–100 bpm
B. 40–60 bpm
C. 20–40 bpm
D. 100–120 bpm

Correct Answer: B
Rationale: The AV node has an intrinsic rate of 40–60 bpm.


11. What is the intrinsic rate of the Purkinje fibers?
A. 60–100 bpm
B. 40–60 bpm
C. 20–40 bpm
D. 100–120 bpm

Correct Answer: C
Rationale: The Purkinje fibers have an intrinsic rate of 20–40 bpm.

, 12. Which lead is most commonly used for continuous cardiac monitoring?
A. Lead I
B. Lead II
C. Lead III
D. Lead aVR

Correct Answer: B
Rationale: Lead II is most commonly used for continuous monitoring because it provides a
clear view of the P wave.


13. What is the normal QTc interval for males?
A. Less than 0.35 seconds
B. Less than 0.44 seconds
C. Less than 0.50 seconds
D. Less than 0.60 seconds

Correct Answer: B
Rationale: Normal QTc for males is less than 0.44 seconds; for females, less than 0.46
seconds.


14. What does the U wave represent on an ECG tracing?
A. Atrial depolarization
B. Ventricular depolarization
C. Purkinje fiber repolarization
D. Atrial repolarization

Correct Answer: C
Rationale: The U wave represents Purkinje fiber repolarization and is often seen in
hypokalemia.


15. Which electrolyte imbalance causes peaked T waves?
A. Hypokalemia
B. Hyperkalemia
C. Hypocalcemia
D. Hypercalcemia