Relias Dysrhythmia Basic A Test – 2025/2026 – Complete Questions and Correct Answers with Explanations

Relias Dysrhythmia Basic A Test –
2025/2026 – Complete Questions and
Correct Answers with Explanations



Relias Dysrhythmia Basic A – Practice
Questions

1. What is the normal heart rate for an adult at rest?
A. 40–60 bpm​
B. 60–100 bpm​
C. 100–120 bpm​
D. 120–140 bpm

Answer: B​
Explanation: The normal resting heart rate for adults is 60–100 beats per minute (bpm).




2. Which part of the ECG represents atrial depolarization?
A. P wave​
B. QRS complex​
C. T wave​
D. PR interval

Answer: A​
Explanation: The P wave corresponds to atrial depolarization.

,3. Which rhythm is characterized by a regular rate of
60–100 bpm, with normal P waves before each QRS
complex?
A. Sinus tachycardia​
B. Sinus bradycardia​
C. Normal sinus rhythm​
D. Atrial fibrillation

Answer: C​
Explanation: Normal sinus rhythm has a regular rate, with P waves preceding each QRS.




4. Sinus bradycardia is defined as:
A. Heart rate >100 bpm​
B. Heart rate <60 bpm​
C. Irregular rhythm​
D. Absence of P waves

Answer: B​
Explanation: Sinus bradycardia occurs when heart rate is less than 60 bpm with normal P
waves and rhythm.




5. Which dysrhythmia shows absent P waves, irregularly
irregular rhythm, and variable ventricular response?
A. Atrial flutter​
B. Atrial fibrillation​
C. Ventricular tachycardia​
D. Sinus tachycardia

Answer: B​
Explanation: Atrial fibrillation has no P waves and an irregularly irregular rhythm.

,6. Which dysrhythmia shows sawtooth-shaped P waves
with a regular atrial rate?
A. Atrial fibrillation​
B. Atrial flutter​
C. Ventricular fibrillation​
D. Junctional rhythm

Answer: B​
Explanation: Atrial flutter is identified by sawtooth flutter waves, often at 250–350 atrial
bpm.




7. What is the main risk associated with atrial fibrillation?
A. Bradycardia​
B. Ventricular fibrillation​
C. Stroke due to thrombus formation​
D. Hyperkalemia

Answer: C​
Explanation: Blood pooling in the atria can form clots, increasing stroke risk.




8. Which dysrhythmia shows wide QRS complexes, rapid
rate, and no P waves?
A. Ventricular tachycardia​
B. Atrial flutter​
C. Sinus tachycardia​
D. First-degree AV block

Answer: A​
Explanation: Ventricular tachycardia arises from ventricles and has wide QRS complexes,
often >100 bpm.

, 9. Which dysrhythmia is immediately life-threatening and
requires defibrillation?
A. Sinus tachycardia​
B. Ventricular fibrillation​
C. Atrial flutter​
D. First-degree AV block

Answer: B​
Explanation: Ventricular fibrillation causes no cardiac output and is fatal without prompt
defibrillation.




10. First-degree AV block is characterized by:
A. PR interval >0.20 seconds, constant for each beat​
B. PR interval <0.12 seconds​
C. Dropped QRS complexes​
D. Irregularly irregular rhythm

Answer: A​
Explanation: First-degree AV block shows prolonged PR interval but all atrial impulses
conduct to ventricles.




11. Second-degree AV block type I (Wenckebach) shows:
A. Progressive PR prolongation followed by dropped QRS​
B. Randomly dropped QRS without PR prolongation​
C. PR interval <0.12 seconds​
D. Ventricular rate >150 bpm

Answer: A​
Explanation: In Mobitz I, the PR interval lengthens progressively until a QRS is dropped.




12. Second-degree AV block type II is characterized by: