RELIAS Dysrhythmia Basic B – 35
Questions With Answers [Verified
Answers] Latest 2026/27
1. Which cardiac structure normally initiates the heartbeat?
A. AV node
B. Sinoatrial (SA) node
C. Bundle branches
D. Purkinje fibers
Rationale: The SA node is the heart’s primary pacemaker.
2. What does the P wave represent on an ECG?
A. Ventricular depolarization
B. Atrial depolarization
C. Ventricular repolarization
D. Atrial repolarization
Rationale: The P wave reflects electrical activation of the atria.
3. What does the QRS complex represent?
A. Atrial contraction
B. Ventricular depolarization
C. Ventricular relaxation only
D. SA node firing only
,Rationale: QRS corresponds to ventricular electrical
activation.
4. What does the T wave represent?
A. Atrial depolarization
B. Ventricular repolarization
C. SA node discharge
D. AV block
Rationale: The T wave reflects ventricular recovery.
5. Normal adult sinus rhythm rate is generally:
A. 20–40 bpm
B. 60–100 bpm
C. 110–140 bpm
D. 150–200 bpm
Rationale: Normal resting sinus rhythm is typically 60–100
bpm.
6. Sinus bradycardia is defined as a heart rate:
A. Above 100 bpm
B. Below 60 bpm
C. Above 150 bpm
D. Irregular only
Rationale: Bradycardia means rate slower than 60 bpm.
, 7. Sinus tachycardia is defined as a heart rate:
A. Below 50 bpm
B. Above 100 bpm
C. Exactly 60 bpm
D. Irregular only
Rationale: Tachycardia means rate faster than 100 bpm.
8. Which rhythm has regular rhythm, rate 60–100, upright P
waves before each QRS?
A. Atrial fibrillation
B. Normal sinus rhythm
C. Ventricular tachycardia
D. Asystole
Rationale: These are classic sinus rhythm characteristics.
9. Which dysrhythmia is irregularly irregular with no distinct P
waves?
A. Sinus bradycardia
B. Atrial fibrillation
C. First-degree AV block
D. Junctional rhythm
Rationale: Atrial fibrillation lacks organized atrial activity.
10. Atrial flutter commonly shows:
A. Flat baseline
Questions With Answers [Verified
Answers] Latest 2026/27
1. Which cardiac structure normally initiates the heartbeat?
A. AV node
B. Sinoatrial (SA) node
C. Bundle branches
D. Purkinje fibers
Rationale: The SA node is the heart’s primary pacemaker.
2. What does the P wave represent on an ECG?
A. Ventricular depolarization
B. Atrial depolarization
C. Ventricular repolarization
D. Atrial repolarization
Rationale: The P wave reflects electrical activation of the atria.
3. What does the QRS complex represent?
A. Atrial contraction
B. Ventricular depolarization
C. Ventricular relaxation only
D. SA node firing only
,Rationale: QRS corresponds to ventricular electrical
activation.
4. What does the T wave represent?
A. Atrial depolarization
B. Ventricular repolarization
C. SA node discharge
D. AV block
Rationale: The T wave reflects ventricular recovery.
5. Normal adult sinus rhythm rate is generally:
A. 20–40 bpm
B. 60–100 bpm
C. 110–140 bpm
D. 150–200 bpm
Rationale: Normal resting sinus rhythm is typically 60–100
bpm.
6. Sinus bradycardia is defined as a heart rate:
A. Above 100 bpm
B. Below 60 bpm
C. Above 150 bpm
D. Irregular only
Rationale: Bradycardia means rate slower than 60 bpm.
, 7. Sinus tachycardia is defined as a heart rate:
A. Below 50 bpm
B. Above 100 bpm
C. Exactly 60 bpm
D. Irregular only
Rationale: Tachycardia means rate faster than 100 bpm.
8. Which rhythm has regular rhythm, rate 60–100, upright P
waves before each QRS?
A. Atrial fibrillation
B. Normal sinus rhythm
C. Ventricular tachycardia
D. Asystole
Rationale: These are classic sinus rhythm characteristics.
9. Which dysrhythmia is irregularly irregular with no distinct P
waves?
A. Sinus bradycardia
B. Atrial fibrillation
C. First-degree AV block
D. Junctional rhythm
Rationale: Atrial fibrillation lacks organized atrial activity.
10. Atrial flutter commonly shows:
A. Flat baseline
