RELIAS DYSRHYTHMIA BASIC A TEST ANSWERS LATEST
2025/2026 100% VERIFIED A+ GRADED
Original 250-question practice bank aligned to the published Dysrhythmia Basic content outline. These are newly written study questions, not a
reproduction of proprietary Relias exam items or answer keys.
Original practice material • Dysrhythmia Basic A Page 1
, ECG FUNDAMENTALS
1. Which ECG component represents atrial depolarization?
■ P wave
• QRS complex
• T wave
• ST segment
2. Which ECG component represents ventricular depolarization?
• P wave
■ QRS complex
• T wave
• PR segment
3. Which ECG component represents ventricular repolarization?
• P wave
• QRS complex
■ T wave
• U wave
4. A normal adult resting sinus rate is generally:
• 20–40/min
• 40–59/min
■ 60–100/min
• 120–160/min
5. A normal PR interval is:
• 0.04–0.10 sec
■ 0.12–0.20 sec
• 0.22–0.30 sec
• 0.32–0.40 sec
6. A normal QRS duration is generally:
■ <0.12 sec
• 0.12–0.20 sec
• 0.20–0.30 sec
• >0.30 sec
7. On standard ECG paper, one small box horizontally represents:
• 0.02 sec
■ 0.04 sec
• 0.10 sec
• 0.20 sec
Original practice material • Dysrhythmia Basic A Page 2
, 8. On standard ECG paper, one large box horizontally represents:
• 0.04 sec
• 0.10 sec
■ 0.20 sec
• 0.40 sec
9. One large ECG box vertically represents:
• 0.1 mV
• 0.2 mV
■ 0.5 mV
• 1.0 mV
10. The SA node is normally the heart’s:
• secondary pacemaker
■ primary pacemaker
• ventricular pacemaker
• AV pacemaker
11. The AV node normally:
• initiates ventricular repolarization
■ delays conduction before ventricular activation
• produces the T wave
• prevents atrial depolarization
12. The intrinsic rate of the SA node is approximately:
• 20–40/min
• 40–60/min
■ 60–100/min
• 100–150/min
13. The intrinsic rate of a junctional pacemaker is approximately:
• 20–40/min
■ 40–60/min
• 70–100/min
• 120–160/min
14. The intrinsic rate of a ventricular pacemaker is approximately:
■ 20–40/min
• 40–60/min
• 60–100/min
• 100–140/min
Original practice material • Dysrhythmia Basic A Page 3
, 15. When calculating rate using the 300 method, you divide 300 by the number of:
• small boxes between P waves
■ large boxes between R waves
• QRS complexes in 6 seconds
• seconds in the strip
16. The 6-second method estimates rate by multiplying the number of QRS complexes by:
•2
•6
■ 10
• 12
17. A regular rhythm has:
■ equal R–R intervals
• no P waves
• wide QRS complexes
• a rate above 100/min
18. A rhythm with progressively changing R–R intervals is described as:
• regular
■ irregular
• paced
• junctional
19. Lead placement and skin preparation primarily help reduce:
• cardiac output
■ artifact
• PR interval
• heart rate
20. Electrical interference on telemetry is commonly caused by:
■ patient movement or poor electrode contact
• a normal P wave
• a short PR interval
• sinus rhythm
21. Normal sinus rhythm should have:
■ one P wave before each QRS
• no P waves
• wide QRS complexes
• irregular R–R intervals
Original practice material • Dysrhythmia Basic A Page 4
2025/2026 100% VERIFIED A+ GRADED
Original 250-question practice bank aligned to the published Dysrhythmia Basic content outline. These are newly written study questions, not a
reproduction of proprietary Relias exam items or answer keys.
Original practice material • Dysrhythmia Basic A Page 1
, ECG FUNDAMENTALS
1. Which ECG component represents atrial depolarization?
■ P wave
• QRS complex
• T wave
• ST segment
2. Which ECG component represents ventricular depolarization?
• P wave
■ QRS complex
• T wave
• PR segment
3. Which ECG component represents ventricular repolarization?
• P wave
• QRS complex
■ T wave
• U wave
4. A normal adult resting sinus rate is generally:
• 20–40/min
• 40–59/min
■ 60–100/min
• 120–160/min
5. A normal PR interval is:
• 0.04–0.10 sec
■ 0.12–0.20 sec
• 0.22–0.30 sec
• 0.32–0.40 sec
6. A normal QRS duration is generally:
■ <0.12 sec
• 0.12–0.20 sec
• 0.20–0.30 sec
• >0.30 sec
7. On standard ECG paper, one small box horizontally represents:
• 0.02 sec
■ 0.04 sec
• 0.10 sec
• 0.20 sec
Original practice material • Dysrhythmia Basic A Page 2
, 8. On standard ECG paper, one large box horizontally represents:
• 0.04 sec
• 0.10 sec
■ 0.20 sec
• 0.40 sec
9. One large ECG box vertically represents:
• 0.1 mV
• 0.2 mV
■ 0.5 mV
• 1.0 mV
10. The SA node is normally the heart’s:
• secondary pacemaker
■ primary pacemaker
• ventricular pacemaker
• AV pacemaker
11. The AV node normally:
• initiates ventricular repolarization
■ delays conduction before ventricular activation
• produces the T wave
• prevents atrial depolarization
12. The intrinsic rate of the SA node is approximately:
• 20–40/min
• 40–60/min
■ 60–100/min
• 100–150/min
13. The intrinsic rate of a junctional pacemaker is approximately:
• 20–40/min
■ 40–60/min
• 70–100/min
• 120–160/min
14. The intrinsic rate of a ventricular pacemaker is approximately:
■ 20–40/min
• 40–60/min
• 60–100/min
• 100–140/min
Original practice material • Dysrhythmia Basic A Page 3
, 15. When calculating rate using the 300 method, you divide 300 by the number of:
• small boxes between P waves
■ large boxes between R waves
• QRS complexes in 6 seconds
• seconds in the strip
16. The 6-second method estimates rate by multiplying the number of QRS complexes by:
•2
•6
■ 10
• 12
17. A regular rhythm has:
■ equal R–R intervals
• no P waves
• wide QRS complexes
• a rate above 100/min
18. A rhythm with progressively changing R–R intervals is described as:
• regular
■ irregular
• paced
• junctional
19. Lead placement and skin preparation primarily help reduce:
• cardiac output
■ artifact
• PR interval
• heart rate
20. Electrical interference on telemetry is commonly caused by:
■ patient movement or poor electrode contact
• a normal P wave
• a short PR interval
• sinus rhythm
21. Normal sinus rhythm should have:
■ one P wave before each QRS
• no P waves
• wide QRS complexes
• irregular R–R intervals
Original practice material • Dysrhythmia Basic A Page 4
