RELIAS DYSRHYTHMIA BASIC TEST – QUESTIONS AND
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS
RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS
1. Cardiac Anatomy and Physiology
2. Basic Electrophysiology and Conduction Pathways
3. ECG Interpretation and Waveform Analysis
4. Sinus Rhythms and Arrhythmias
5. Atrial Rhythms and Arrhythmias
6. Junctional Rhythms and Arrhythmias
7. Ventricular Rhythms and Arrhythmias
8. Heart Block and Conduction Disturbances
9. Pacemaker Rhythms and Function
10. Clinical Application and Patient Assessment
INTRODUCTION
This comprehensive examination is designed to assess foundational knowledge and clinical
competency in basic cardiac dysrhythmia interpretation. The assessment evaluates the healthcare
professional's ability to accurately identify normal and abnormal cardiac rhythms, understand
electrophysiological principles, and apply this knowledge to real-world patient care scenarios. The
examination consists of multiple-choice questions that range from theoretical concepts to practical
application, requiring critical thinking and clinical decision-making skills. Each question is
accompanied by a detailed rationale to reinforce learning and enhance understanding. This
assessment emphasizes the integration of rhythm interpretation with patient assessment, recognition
of clinical significance, and appropriate nursing and medical interventions. Successful completion
demonstrates competency in basic dysrhythmia recognition and foundational cardiac care knowledge.
SECTION ONE: QUESTIONS 1 – 100
Question 1
A patient's cardiac monitor displays a regular rhythm with a rate of 82 beats per minute. Each QRS
complex is preceded by a P wave, and the PR interval measures 0.16 seconds. What is the most
accurate interpretation of this rhythm?
,A. Sinus tachycardia
B. Normal sinus rhythm
C. Sinus bradycardia
D. First-degree AV block
🟢 Correct answer: B
🔴 Explanation: This rhythm meets all criteria for normal sinus rhythm: regular rhythm, rate
between 60-100 bpm, each QRS preceded by a P wave, and PR interval between 0.12-0.20 seconds.
Sinus tachycardia would exceed 100 bpm, sinus bradycardia would be less than 60 bpm, and first-
degree AV block would demonstrate a PR interval greater than 0.20 seconds.
Question 2
Which of the following correctly describes the intrinsic firing rate of the sinoatrial (SA) node?
A. 20-40 beats per minute
B. 40-60 beats per minute
C. 60-100 beats per minute
D. 100-150 beats per minute
🟢 Correct answer: C
🔴 Explanation: The SA node normally discharges at a rate of 60-100 beats per minute and serves
as the primary pacemaker of the heart. The AV node has an intrinsic rate of 40-60 bpm, and the
Purkinje fibers have an intrinsic rate of 20-40 bpm.
Question 3
A patient presents with a heart rate of 46 beats per minute, regular rhythm, and normal P waves
preceding each QRS complex. The patient reports occasional dizziness. Which medication is most
likely contributing to this rhythm?
A. Metoprolol
B. Amiodarone
C. Atropine
D. Digoxin
🟢 Correct answer: A
🔴 Explanation: Metoprolol is a beta-blocker that decreases sympathetic stimulation to the heart,
potentially causing sinus bradycardia. The rate of 46 bpm with normal P waves and regular rhythm
is characteristic of sinus bradycardia. Atropine is used to treat bradycardia, and digoxin may cause
various arrhythmias including bradycardia but beta-blockers are the most common cause in this
scenario.
,Question 4
What is the normal duration range for the PR interval?
A. 0.04-0.10 seconds
B. 0.08-0.12 seconds
C. 0.12-0.20 seconds
D. 0.20-0.30 seconds
🟢 Correct answer: C
🔴 Explanation: The PR interval measures the time from the beginning of atrial depolarization to
the beginning of ventricular depolarization. Normal duration is 0.12-0.20 seconds (120-200
milliseconds). This represents the time required for the impulse to travel from the SA node through
the atria, AV node, and His-Purkinje system.
Question 5
A cardiac monitor shows a regular rhythm with a rate of 110 beats per minute, normal P waves, and
a PR interval of 0.14 seconds. What is the correct interpretation?
A. Sinus tachycardia
B. Normal sinus rhythm
C. Supraventricular tachycardia
D. Atrial flutter
🟢 Correct answer: A
🔴 Explanation: Sinus tachycardia is defined as a sinus rhythm with a rate exceeding 100 beats per
minute. The presence of normal P waves and a normal PR interval indicates the impulse originates
from the SA node. The rate of 110 bpm confirms tachycardia while maintaining normal conduction
characteristics.
Question 6
Which wave on an ECG represents ventricular repolarization?
A. P wave
B. QRS complex
C. T wave
D. U wave
🟢 Correct answer: C
🔴 Explanation: The T wave represents ventricular repolarization, which is the recovery of
ventricular muscle cells following depolarization. The P wave represents atrial depolarization, the
QRS complex represents ventricular depolarization, and the U wave, when present, is thought to
represent repolarization of the Purkinje fibers.
, Question 7
A patient's rhythm strip shows a regular rhythm with a rate of 54 beats per minute, a P wave before
each QRS complex, and a PR interval of 0.18 seconds. What is the most appropriate initial nursing
action?
A. Prepare for immediate cardioversion
B. Administer atropine 1 mg IV push
C. Assess for signs of hemodynamic instability
D. Prepare for transcutaneous pacing
🟢 Correct answer: C
🔴 Explanation: Sinus bradycardia is defined as a rate less than 60 bpm. The initial priority is to
assess the patient's clinical status, including blood pressure, level of consciousness, and signs of
decreased perfusion. Intervention is only indicated if the patient is symptomatic. Atropine and
pacing are treatments for symptomatic bradycardia, not first-line assessments.
Question 8
What is the normal duration of the QRS complex?
A. 0.04-0.08 seconds
B. 0.06-0.10 seconds
C. 0.08-0.12 seconds
D. 0.12-0.16 seconds
🟢 Correct answer: C
🔴 Explanation: The QRS complex should normally measure 0.08-0.12 seconds (80-120
milliseconds). This duration represents the time required for ventricular depolarization. A QRS
duration greater than 0.12 seconds indicates a ventricular conduction delay or bundle branch block.
Question 9
A patient's ECG shows a regular rhythm with a rate of 78 beats per minute. The PR interval is 0.24
seconds and consistent throughout. What is the rhythm interpretation?
A. Normal sinus rhythm
B. First-degree AV block
C. Second-degree AV block, Mobitz Type I
D. Second-degree AV block, Mobitz Type II
🟢 Correct answer: B
🔴 Explanation: First-degree AV block is diagnosed when the PR interval exceeds 0.20 seconds but
remains consistent. The rhythm is regular with a normal rate, and every P wave is followed by a QRS
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS
RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS
1. Cardiac Anatomy and Physiology
2. Basic Electrophysiology and Conduction Pathways
3. ECG Interpretation and Waveform Analysis
4. Sinus Rhythms and Arrhythmias
5. Atrial Rhythms and Arrhythmias
6. Junctional Rhythms and Arrhythmias
7. Ventricular Rhythms and Arrhythmias
8. Heart Block and Conduction Disturbances
9. Pacemaker Rhythms and Function
10. Clinical Application and Patient Assessment
INTRODUCTION
This comprehensive examination is designed to assess foundational knowledge and clinical
competency in basic cardiac dysrhythmia interpretation. The assessment evaluates the healthcare
professional's ability to accurately identify normal and abnormal cardiac rhythms, understand
electrophysiological principles, and apply this knowledge to real-world patient care scenarios. The
examination consists of multiple-choice questions that range from theoretical concepts to practical
application, requiring critical thinking and clinical decision-making skills. Each question is
accompanied by a detailed rationale to reinforce learning and enhance understanding. This
assessment emphasizes the integration of rhythm interpretation with patient assessment, recognition
of clinical significance, and appropriate nursing and medical interventions. Successful completion
demonstrates competency in basic dysrhythmia recognition and foundational cardiac care knowledge.
SECTION ONE: QUESTIONS 1 – 100
Question 1
A patient's cardiac monitor displays a regular rhythm with a rate of 82 beats per minute. Each QRS
complex is preceded by a P wave, and the PR interval measures 0.16 seconds. What is the most
accurate interpretation of this rhythm?
,A. Sinus tachycardia
B. Normal sinus rhythm
C. Sinus bradycardia
D. First-degree AV block
🟢 Correct answer: B
🔴 Explanation: This rhythm meets all criteria for normal sinus rhythm: regular rhythm, rate
between 60-100 bpm, each QRS preceded by a P wave, and PR interval between 0.12-0.20 seconds.
Sinus tachycardia would exceed 100 bpm, sinus bradycardia would be less than 60 bpm, and first-
degree AV block would demonstrate a PR interval greater than 0.20 seconds.
Question 2
Which of the following correctly describes the intrinsic firing rate of the sinoatrial (SA) node?
A. 20-40 beats per minute
B. 40-60 beats per minute
C. 60-100 beats per minute
D. 100-150 beats per minute
🟢 Correct answer: C
🔴 Explanation: The SA node normally discharges at a rate of 60-100 beats per minute and serves
as the primary pacemaker of the heart. The AV node has an intrinsic rate of 40-60 bpm, and the
Purkinje fibers have an intrinsic rate of 20-40 bpm.
Question 3
A patient presents with a heart rate of 46 beats per minute, regular rhythm, and normal P waves
preceding each QRS complex. The patient reports occasional dizziness. Which medication is most
likely contributing to this rhythm?
A. Metoprolol
B. Amiodarone
C. Atropine
D. Digoxin
🟢 Correct answer: A
🔴 Explanation: Metoprolol is a beta-blocker that decreases sympathetic stimulation to the heart,
potentially causing sinus bradycardia. The rate of 46 bpm with normal P waves and regular rhythm
is characteristic of sinus bradycardia. Atropine is used to treat bradycardia, and digoxin may cause
various arrhythmias including bradycardia but beta-blockers are the most common cause in this
scenario.
,Question 4
What is the normal duration range for the PR interval?
A. 0.04-0.10 seconds
B. 0.08-0.12 seconds
C. 0.12-0.20 seconds
D. 0.20-0.30 seconds
🟢 Correct answer: C
🔴 Explanation: The PR interval measures the time from the beginning of atrial depolarization to
the beginning of ventricular depolarization. Normal duration is 0.12-0.20 seconds (120-200
milliseconds). This represents the time required for the impulse to travel from the SA node through
the atria, AV node, and His-Purkinje system.
Question 5
A cardiac monitor shows a regular rhythm with a rate of 110 beats per minute, normal P waves, and
a PR interval of 0.14 seconds. What is the correct interpretation?
A. Sinus tachycardia
B. Normal sinus rhythm
C. Supraventricular tachycardia
D. Atrial flutter
🟢 Correct answer: A
🔴 Explanation: Sinus tachycardia is defined as a sinus rhythm with a rate exceeding 100 beats per
minute. The presence of normal P waves and a normal PR interval indicates the impulse originates
from the SA node. The rate of 110 bpm confirms tachycardia while maintaining normal conduction
characteristics.
Question 6
Which wave on an ECG represents ventricular repolarization?
A. P wave
B. QRS complex
C. T wave
D. U wave
🟢 Correct answer: C
🔴 Explanation: The T wave represents ventricular repolarization, which is the recovery of
ventricular muscle cells following depolarization. The P wave represents atrial depolarization, the
QRS complex represents ventricular depolarization, and the U wave, when present, is thought to
represent repolarization of the Purkinje fibers.
, Question 7
A patient's rhythm strip shows a regular rhythm with a rate of 54 beats per minute, a P wave before
each QRS complex, and a PR interval of 0.18 seconds. What is the most appropriate initial nursing
action?
A. Prepare for immediate cardioversion
B. Administer atropine 1 mg IV push
C. Assess for signs of hemodynamic instability
D. Prepare for transcutaneous pacing
🟢 Correct answer: C
🔴 Explanation: Sinus bradycardia is defined as a rate less than 60 bpm. The initial priority is to
assess the patient's clinical status, including blood pressure, level of consciousness, and signs of
decreased perfusion. Intervention is only indicated if the patient is symptomatic. Atropine and
pacing are treatments for symptomatic bradycardia, not first-line assessments.
Question 8
What is the normal duration of the QRS complex?
A. 0.04-0.08 seconds
B. 0.06-0.10 seconds
C. 0.08-0.12 seconds
D. 0.12-0.16 seconds
🟢 Correct answer: C
🔴 Explanation: The QRS complex should normally measure 0.08-0.12 seconds (80-120
milliseconds). This duration represents the time required for ventricular depolarization. A QRS
duration greater than 0.12 seconds indicates a ventricular conduction delay or bundle branch block.
Question 9
A patient's ECG shows a regular rhythm with a rate of 78 beats per minute. The PR interval is 0.24
seconds and consistent throughout. What is the rhythm interpretation?
A. Normal sinus rhythm
B. First-degree AV block
C. Second-degree AV block, Mobitz Type I
D. Second-degree AV block, Mobitz Type II
🟢 Correct answer: B
🔴 Explanation: First-degree AV block is diagnosed when the PR interval exceeds 0.20 seconds but
remains consistent. The rhythm is regular with a normal rate, and every P wave is followed by a QRS
