RELIAS DYSRHYTHMIA BASIC TEST 120 QUESTIONS
AND ANSWERS 2026/2027 (BASIC A DYSRHYTHMIA)
BASIC DYSHYTHMIA COMPREHENSIVE PRACTICE
EXAMINATION
Original 120-Question Practice Examination
Course Code: Basic A Dysrhythmia
Course Name: Basic Dysrhythmia
Institution: Relias — Practice/Study Edition
Academic Year: 2026/2027
Creator: Original educational practice material
IMPORTANT: THIS IS AN ORIGINAL PRACTICE EXAMINATION FOR
STUDY AND PREPARATION.
TABLE OF CONTENTS
1. ECG Fundamentals and Cardiac Conduction — Questions 1–15
2. Sinus Rhythms — Questions 16–27
3. Atrial Dysrhythmias — Questions 28–42
4. Junctional Rhythms — Questions 43–52
5. Premature Ventricular Complexes — Questions 53–62
6. Ventricular Dysrhythmias — Questions 63–77
7. AV Blocks — Questions 78–92
8. Paced Rhythms — Questions 93–101
9. Rhythm Interpretation and Clinical Response — Questions 102–111
10. Comprehensive Mixed Review — Questions 112–120
SECTION 1 — ECG FUNDAMENTALS AND CARDIAC CONDUCTION
,Question 1
Multiple Choice
Which structure normally serves as the heart's primary pacemaker?
A. AV node
B. SA node
C. Bundle of His
D. Purkinje fibers
Correct answer: B. SA node
Rationale: The sinoatrial (SA) node normally has the fastest intrinsic pacemaker rate and
therefore controls the heart's rhythm under normal circumstances. Electrical activity generated in
the SA node spreads through the atria before reaching the AV node and ventricular conduction
system.
Question 2
Multiple Choice
What does the P wave represent on a normal ECG?
A. Ventricular depolarization
B. Ventricular repolarization
C. Atrial depolarization
D. Atrial repolarization
Correct answer: C. Atrial depolarization
Rationale: The P wave represents electrical depolarization of the atria. Mechanical atrial
contraction follows electrical depolarization. A normal sinus rhythm should generally have a P
wave associated with each QRS complex.
Question 3
Multiple Choice
The QRS complex primarily represents:
A. Atrial depolarization
B. Ventricular depolarization
C. Atrial contraction
D. Ventricular relaxation
,Correct answer: B. Ventricular depolarization
Rationale: The QRS complex represents electrical depolarization of the ventricles. Ventricular
mechanical contraction occurs shortly after depolarization.
Question 4
Multiple Choice
Which ECG component generally represents ventricular repolarization?
A. P wave
B. PR interval
C. QRS complex
D. T wave
Correct answer: D. T wave
Rationale: The T wave represents ventricular repolarization, during which ventricular
myocardial cells recover electrically in preparation for the next cardiac cycle.
Question 5
Short Answer
What is the normal intrinsic pacemaker rate of the SA node?
Correct answer: Approximately 60–100 beats per minute.
Rationale: The SA node normally fires at approximately 60–100 beats/minute and generally
overrides slower latent pacemakers. When the SA node fails to generate impulses appropriately,
lower pacemaker sites may assume control.
Question 6
Multiple Choice
Which structure normally delays electrical conduction between the atria and ventricles?
A. SA node
B. AV node
C. Purkinje system
D. Ventricular myocardium
, Correct answer: B. AV node
Rationale: The AV node provides an important conduction delay. This delay allows the atria
time to complete their contraction and contribute to ventricular filling before ventricular
depolarization occurs.
Question 7
Multiple Choice
A normal PR interval is generally:
A. 0.04–0.08 second
B. 0.12–0.20 second
C. 0.22–0.30 second
D. 0.30–0.40 second
Correct answer: B. 0.12–0.20 second
Rationale: The PR interval measures conduction from the beginning of atrial depolarization to
the beginning of ventricular depolarization. A normal PR interval is approximately 0.12–0.20
second.
Question 8
Multiple Choice
A QRS duration of 0.14 second would generally be described as:
A. Narrow
B. Normal
C. Wide
D. Absent
Correct answer: C. Wide
Rationale: A normal QRS is generally less than 0.12 second. A QRS of 0.12 second or greater is
considered wide and may indicate abnormal ventricular conduction or a ventricular origin.
Question 9
Multiple Choice
One small ECG box on standard paper represents:
AND ANSWERS 2026/2027 (BASIC A DYSRHYTHMIA)
BASIC DYSHYTHMIA COMPREHENSIVE PRACTICE
EXAMINATION
Original 120-Question Practice Examination
Course Code: Basic A Dysrhythmia
Course Name: Basic Dysrhythmia
Institution: Relias — Practice/Study Edition
Academic Year: 2026/2027
Creator: Original educational practice material
IMPORTANT: THIS IS AN ORIGINAL PRACTICE EXAMINATION FOR
STUDY AND PREPARATION.
TABLE OF CONTENTS
1. ECG Fundamentals and Cardiac Conduction — Questions 1–15
2. Sinus Rhythms — Questions 16–27
3. Atrial Dysrhythmias — Questions 28–42
4. Junctional Rhythms — Questions 43–52
5. Premature Ventricular Complexes — Questions 53–62
6. Ventricular Dysrhythmias — Questions 63–77
7. AV Blocks — Questions 78–92
8. Paced Rhythms — Questions 93–101
9. Rhythm Interpretation and Clinical Response — Questions 102–111
10. Comprehensive Mixed Review — Questions 112–120
SECTION 1 — ECG FUNDAMENTALS AND CARDIAC CONDUCTION
,Question 1
Multiple Choice
Which structure normally serves as the heart's primary pacemaker?
A. AV node
B. SA node
C. Bundle of His
D. Purkinje fibers
Correct answer: B. SA node
Rationale: The sinoatrial (SA) node normally has the fastest intrinsic pacemaker rate and
therefore controls the heart's rhythm under normal circumstances. Electrical activity generated in
the SA node spreads through the atria before reaching the AV node and ventricular conduction
system.
Question 2
Multiple Choice
What does the P wave represent on a normal ECG?
A. Ventricular depolarization
B. Ventricular repolarization
C. Atrial depolarization
D. Atrial repolarization
Correct answer: C. Atrial depolarization
Rationale: The P wave represents electrical depolarization of the atria. Mechanical atrial
contraction follows electrical depolarization. A normal sinus rhythm should generally have a P
wave associated with each QRS complex.
Question 3
Multiple Choice
The QRS complex primarily represents:
A. Atrial depolarization
B. Ventricular depolarization
C. Atrial contraction
D. Ventricular relaxation
,Correct answer: B. Ventricular depolarization
Rationale: The QRS complex represents electrical depolarization of the ventricles. Ventricular
mechanical contraction occurs shortly after depolarization.
Question 4
Multiple Choice
Which ECG component generally represents ventricular repolarization?
A. P wave
B. PR interval
C. QRS complex
D. T wave
Correct answer: D. T wave
Rationale: The T wave represents ventricular repolarization, during which ventricular
myocardial cells recover electrically in preparation for the next cardiac cycle.
Question 5
Short Answer
What is the normal intrinsic pacemaker rate of the SA node?
Correct answer: Approximately 60–100 beats per minute.
Rationale: The SA node normally fires at approximately 60–100 beats/minute and generally
overrides slower latent pacemakers. When the SA node fails to generate impulses appropriately,
lower pacemaker sites may assume control.
Question 6
Multiple Choice
Which structure normally delays electrical conduction between the atria and ventricles?
A. SA node
B. AV node
C. Purkinje system
D. Ventricular myocardium
, Correct answer: B. AV node
Rationale: The AV node provides an important conduction delay. This delay allows the atria
time to complete their contraction and contribute to ventricular filling before ventricular
depolarization occurs.
Question 7
Multiple Choice
A normal PR interval is generally:
A. 0.04–0.08 second
B. 0.12–0.20 second
C. 0.22–0.30 second
D. 0.30–0.40 second
Correct answer: B. 0.12–0.20 second
Rationale: The PR interval measures conduction from the beginning of atrial depolarization to
the beginning of ventricular depolarization. A normal PR interval is approximately 0.12–0.20
second.
Question 8
Multiple Choice
A QRS duration of 0.14 second would generally be described as:
A. Narrow
B. Normal
C. Wide
D. Absent
Correct answer: C. Wide
Rationale: A normal QRS is generally less than 0.12 second. A QRS of 0.12 second or greater is
considered wide and may indicate abnormal ventricular conduction or a ventricular origin.
Question 9
Multiple Choice
One small ECG box on standard paper represents:
