1
RELIAS DYSRHYTHMIA BASIC A EXAM [QUESTION
1-200] AND ANSWERS UPDATED 2026-2027 100%
VERIFIED DETAILED RATIONALES – PASS
GUARANTEED A+ GRADED INSTANT DOWNLOAD
INTRODUCTION
The Relias Dysrhythmia Basic A Exam is a rigorous, standardized competency assessment designed
for registered nurses, telemetry technicians, and allied healthcare professionals who manage
patients in monitored care settings. This critical evaluation measures a clinician's ability to safely and
accurately interpret electrocardiogram (ECG) waveforms, identify lethal and non-lethal cardiac
dysrhythmias, understand underlying electrophysiological mechanisms, and initiate appropriate
evidence-based clinical interventions.
Passing this exam is essential for clinical privileges in telemetry, step-down units, emergency
departments, and intensive care units, ensuring patient safety and rapid response to life-threatening
rhythm changes. The exam format features challenging scenario-based and rhythm-recognition
multiple-choice questions that test applied critical thinking rather than simple memorization. This
comprehensive 200-question practice question bank is meticulously designed to mirror the exact
blueprint, cognitive rigor, and current clinical guidelines of the official exam, providing detailed
rationales for every option to guarantee first-attempt success.
CORE DOMAINS TESTED
1. Basic ECG Principles and Electrophysiology (Questions 1–30): Anatomy of the cardiac
conduction system, waveform components, intervals, segments, and accurate heart rate
calculation methods.
2. Sinus Rhythms (Questions 31–60): Normal sinus rhythm, sinus bradycardia, sinus
tachycardia, and sinus arrhythmia, focusing on rate variations and clinical presentation.
3. Atrial Dysrhythmias (Questions 61–90): Premature atrial complexes (PACs), atrial flutter,
atrial fibrillation, and supraventricular tachycardia (SVT), emphasizing hemodynamic impact.
4. Junctional Rhythms (Questions 91–110): Junctional escape rhythm, accelerated junctional
rhythm, junctional tachycardia, and premature junctional complexes (PJCs).
5. Ventricular Dysrhythmias (Questions 111–150): Premature ventricular contractions (PVCs),
ventricular tachycardia (VT), ventricular fibrillation (V-fib), idioventricular rhythms, and
Torsades de Pointes.
6. Atrioventricular (AV) Blocks (Questions 151–180): First-degree, second-degree (Mobitz I and
Mobitz II), and third-degree (complete) heart blocks.
,2
7. Pacemaker Rhythms and Advanced Clinical Scenarios (Questions 181–200): Basic
pacemaker operation, failure to capture, failure to sense, and emergency algorithms.
QUESTIONS SECTION
QUESTIONS 1-100
Q1: Which component of the cardiac conduction system has the
highest intrinsic pacing rate, normally acting as the primary
pacemaker of the heart?
A) Atrioventricular (AV) node
B) Sinoatrial (SA) node
C) Bundle of His
D) Purkinje fibers
Rationale: The correct answer is B because the sinoatrial (SA) node
possesses the highest intrinsic firing rate of 60 to 100 beats per
minute, establishing it as the dominant pacemaker. Option A is
incorrect because the AV node has an intrinsic rate of 40 to 60 beats
per minute. Option C is incorrect because the Bundle of His fires at 40
to 45 beats per minute. Option D is incorrect because the Purkinje
fibers have an intrinsic rate of 20 to 50 beats per minute.
Q2: When calculating the heart rate using the 6-second strip method
on a regular rhythm, which of the following approaches is clinically
recommended?
A) Count the number of R waves in a 6-second strip and multiply by
10
B) Count the number of R waves in a 6-second strip and multiply by
10 for irregular rhythms, while using the 1500 method for regular
rhythms
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C) Divide 300 by the number of large boxes between consecutive P
waves
D) Measure the exact millivolt amplitude of the QRS complex and
multiply by the QT interval
Rationale: The correct answer is B because while the 6-second strip
method (number of R waves × 10) can estimate any rate, it is
mathematically required for irregular rhythms, whereas regular
rhythms are more accurately measured using the 1500 method.
Option A is incomplete because it only names half of the rule. Option
C is incorrect because the divisor for large boxes is 1500 for small
boxes, or 300 for large boxes, using R-to-R intervals rather than P
waves. Option D is incorrect because amplitude and QT interval have
no relation to rate calculation.
Q3: A patient's ECG strip shows a normal P wave, a PR interval of 0.14
seconds, and a QRS duration of 0.08 seconds occurring at a rate of 74
beats per minute with regular R-R intervals. How should this rhythm
be interpreted?
A) Sinus bradycardia
B) Normal sinus rhythm
C) Sinus arrhythmia
D) First-degree AV block
Rationale: The correct answer is B because a heart rate between 60
and 100 beats per minute, regular rhythm, upright matching P waves,
and normal intervals (PR 0.12–0.20 sec, QRS < 0.12 sec) define a
normal sinus rhythm. Option A is incorrect because the rate is above
60. Option C is incorrect because the R-R intervals are regular. Option
D is incorrect because the PR interval is within normal limits.
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Q4: Which electrophysiological property describes the ability of
cardiac muscle cells to generate an action potential spontaneously
without external nervous stimulation?
A) Conductivity
B) Contractility
C) Automaticity
D) Excitability
Rationale: The correct answer is C because automaticity is the unique
pacemaker property of specialized cardiac cells to depolarize
spontaneously. Option A is incorrect because conductivity is the
ability to transmit an electrical impulse. Option B is incorrect because
contractility is the mechanical shortening of muscle fibers. Option D is
incorrect because excitability is the ability to respond to an external
electrical stimulus.
Q5: What is the normal physiological duration of the QRS complex in
an adult patient?
A) 0.02 to 0.04 seconds
B) 0.06 to 0.10 seconds (less than 0.12 seconds)
C) 0.12 to 0.20 seconds
D) 0.36 to 0.44 seconds
Rationale: The correct answer is B because a normal QRS complex
measures between 0.06 and 0.10 seconds, indicating rapid
depolarization of the ventricles via the normal conduction pathway.
Option A is too short for a complete QRS complex. Option C
represents the normal duration range of the PR interval. Option D
represents the typical corrected QT interval duration.
RELIAS DYSRHYTHMIA BASIC A EXAM [QUESTION
1-200] AND ANSWERS UPDATED 2026-2027 100%
VERIFIED DETAILED RATIONALES – PASS
GUARANTEED A+ GRADED INSTANT DOWNLOAD
INTRODUCTION
The Relias Dysrhythmia Basic A Exam is a rigorous, standardized competency assessment designed
for registered nurses, telemetry technicians, and allied healthcare professionals who manage
patients in monitored care settings. This critical evaluation measures a clinician's ability to safely and
accurately interpret electrocardiogram (ECG) waveforms, identify lethal and non-lethal cardiac
dysrhythmias, understand underlying electrophysiological mechanisms, and initiate appropriate
evidence-based clinical interventions.
Passing this exam is essential for clinical privileges in telemetry, step-down units, emergency
departments, and intensive care units, ensuring patient safety and rapid response to life-threatening
rhythm changes. The exam format features challenging scenario-based and rhythm-recognition
multiple-choice questions that test applied critical thinking rather than simple memorization. This
comprehensive 200-question practice question bank is meticulously designed to mirror the exact
blueprint, cognitive rigor, and current clinical guidelines of the official exam, providing detailed
rationales for every option to guarantee first-attempt success.
CORE DOMAINS TESTED
1. Basic ECG Principles and Electrophysiology (Questions 1–30): Anatomy of the cardiac
conduction system, waveform components, intervals, segments, and accurate heart rate
calculation methods.
2. Sinus Rhythms (Questions 31–60): Normal sinus rhythm, sinus bradycardia, sinus
tachycardia, and sinus arrhythmia, focusing on rate variations and clinical presentation.
3. Atrial Dysrhythmias (Questions 61–90): Premature atrial complexes (PACs), atrial flutter,
atrial fibrillation, and supraventricular tachycardia (SVT), emphasizing hemodynamic impact.
4. Junctional Rhythms (Questions 91–110): Junctional escape rhythm, accelerated junctional
rhythm, junctional tachycardia, and premature junctional complexes (PJCs).
5. Ventricular Dysrhythmias (Questions 111–150): Premature ventricular contractions (PVCs),
ventricular tachycardia (VT), ventricular fibrillation (V-fib), idioventricular rhythms, and
Torsades de Pointes.
6. Atrioventricular (AV) Blocks (Questions 151–180): First-degree, second-degree (Mobitz I and
Mobitz II), and third-degree (complete) heart blocks.
,2
7. Pacemaker Rhythms and Advanced Clinical Scenarios (Questions 181–200): Basic
pacemaker operation, failure to capture, failure to sense, and emergency algorithms.
QUESTIONS SECTION
QUESTIONS 1-100
Q1: Which component of the cardiac conduction system has the
highest intrinsic pacing rate, normally acting as the primary
pacemaker of the heart?
A) Atrioventricular (AV) node
B) Sinoatrial (SA) node
C) Bundle of His
D) Purkinje fibers
Rationale: The correct answer is B because the sinoatrial (SA) node
possesses the highest intrinsic firing rate of 60 to 100 beats per
minute, establishing it as the dominant pacemaker. Option A is
incorrect because the AV node has an intrinsic rate of 40 to 60 beats
per minute. Option C is incorrect because the Bundle of His fires at 40
to 45 beats per minute. Option D is incorrect because the Purkinje
fibers have an intrinsic rate of 20 to 50 beats per minute.
Q2: When calculating the heart rate using the 6-second strip method
on a regular rhythm, which of the following approaches is clinically
recommended?
A) Count the number of R waves in a 6-second strip and multiply by
10
B) Count the number of R waves in a 6-second strip and multiply by
10 for irregular rhythms, while using the 1500 method for regular
rhythms
,3
C) Divide 300 by the number of large boxes between consecutive P
waves
D) Measure the exact millivolt amplitude of the QRS complex and
multiply by the QT interval
Rationale: The correct answer is B because while the 6-second strip
method (number of R waves × 10) can estimate any rate, it is
mathematically required for irregular rhythms, whereas regular
rhythms are more accurately measured using the 1500 method.
Option A is incomplete because it only names half of the rule. Option
C is incorrect because the divisor for large boxes is 1500 for small
boxes, or 300 for large boxes, using R-to-R intervals rather than P
waves. Option D is incorrect because amplitude and QT interval have
no relation to rate calculation.
Q3: A patient's ECG strip shows a normal P wave, a PR interval of 0.14
seconds, and a QRS duration of 0.08 seconds occurring at a rate of 74
beats per minute with regular R-R intervals. How should this rhythm
be interpreted?
A) Sinus bradycardia
B) Normal sinus rhythm
C) Sinus arrhythmia
D) First-degree AV block
Rationale: The correct answer is B because a heart rate between 60
and 100 beats per minute, regular rhythm, upright matching P waves,
and normal intervals (PR 0.12–0.20 sec, QRS < 0.12 sec) define a
normal sinus rhythm. Option A is incorrect because the rate is above
60. Option C is incorrect because the R-R intervals are regular. Option
D is incorrect because the PR interval is within normal limits.
, 4
Q4: Which electrophysiological property describes the ability of
cardiac muscle cells to generate an action potential spontaneously
without external nervous stimulation?
A) Conductivity
B) Contractility
C) Automaticity
D) Excitability
Rationale: The correct answer is C because automaticity is the unique
pacemaker property of specialized cardiac cells to depolarize
spontaneously. Option A is incorrect because conductivity is the
ability to transmit an electrical impulse. Option B is incorrect because
contractility is the mechanical shortening of muscle fibers. Option D is
incorrect because excitability is the ability to respond to an external
electrical stimulus.
Q5: What is the normal physiological duration of the QRS complex in
an adult patient?
A) 0.02 to 0.04 seconds
B) 0.06 to 0.10 seconds (less than 0.12 seconds)
C) 0.12 to 0.20 seconds
D) 0.36 to 0.44 seconds
Rationale: The correct answer is B because a normal QRS complex
measures between 0.06 and 0.10 seconds, indicating rapid
depolarization of the ventricles via the normal conduction pathway.
Option A is too short for a complete QRS complex. Option C
represents the normal duration range of the PR interval. Option D
represents the typical corrected QT interval duration.
