RELIAS DYSRHYTHMIA BASIC A
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📋 DOCUMENT OVERVIEW 55 Qs
This document, "Relias Dysrhythmia Basic A," covers specific topics in electrocardiography (ECG),
including normal and abnormal heart rhythms, such as sinus rhythm, bradycardia, tachycardia,
premature atrial contractions, atrial fibrillation, junctional rhythms, and rhythms related to failure of the
sinoatrial (SA) or atrioventricular (AV) nodes. The document provides 55 questions with correct answers
and detailed explanations, including diagrams and images, to help students understand ECG concepts.
Students can use this document to review and study dysrhythmia concepts, reinforcing their
understanding of ECG readings and interpretations for exam preparation.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
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EXAM QUESTIONS
QUESTION 1
Normal sinus rhythm
CORRECT ANSWER
Regular
Rate: 60-100
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
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, RATIONALE: This description characterizes a normal sinus rhythm because it indicates that the heart is beating at a
regular rate, which is defined by a narrow QRS complex and a distinct PR interval, both of which are within normal
limits. The presence of a P wave, which is upright, further supports this diagnosis by indicating that the heartbeat
originates from the sinus node and is not a result of an abnormal electrical conduction pathway.
QUESTION 2
Sinus Bradycardia
CORRECT ANSWER
Regular
Rate: <60
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
RATIONALE: The key concept in diagnosing Sinus Bradycardia is a heart rate slower than 60 beats per minute, which is
reflected in the given rate. The presence of a normal P wave and a narrow PR interval, along with a narrow QRS
complex, confirms that the slow heart rate originates from the sinoatrial (SA) node, making it a true sinus rhythm.
QUESTION 3
Sinus Tachycardia
CORRECT ANSWER
Regular
Rate: 100-150
P Wave: Present, upright
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, PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
RATIONALE: Sinus tachycardia is characterized by an elevated heart rate that is typically above 100 beats per minute,
with a P wave that is upright and present, indicating that the impulse is originating from the sinoatrial (SA) node. The
PR interval and QRS duration provided in the given answer are within normal ranges, consistent with the SA node's
normal conduction pathway and ventricular depolarization, further supporting the diagnosis of sinus tachycardia.
QUESTION 4
Premature Atrial Contraction
CORRECT ANSWER
IRREGULAR
Rate: depends on underlying rhythm
P wave: Present or hidden in T wave
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
RATIONALE: A Premature Atrial Contraction (PAC) occurs when an ectopic atrial impulse triggers a heartbeat before the
next expected sinus beat, often disrupting the underlying rhythm, and as a result, the P wave may be hidden in the T
wave of the preceding beat or appear irregularly. This disrupts the normal sequence and timing of the cardiac electrical
conduction, explaining the irregular rate and altered intervals.
QUESTION 5
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55+ (2026 Full Exam Kit) Solved Q&A | Correct & Verified Answers
100% Guarantee Pass
📋 DOCUMENT OVERVIEW 55 Qs
This document, "Relias Dysrhythmia Basic A," covers specific topics in electrocardiography (ECG),
including normal and abnormal heart rhythms, such as sinus rhythm, bradycardia, tachycardia,
premature atrial contractions, atrial fibrillation, junctional rhythms, and rhythms related to failure of the
sinoatrial (SA) or atrioventricular (AV) nodes. The document provides 55 questions with correct answers
and detailed explanations, including diagrams and images, to help students understand ECG concepts.
Students can use this document to review and study dysrhythmia concepts, reinforcing their
understanding of ECG readings and interpretations for exam preparation.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
Trusted by thousands of students and professionals worldwide
EXAM QUESTIONS
QUESTION 1
Normal sinus rhythm
CORRECT ANSWER
Regular
Rate: 60-100
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
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, RATIONALE: This description characterizes a normal sinus rhythm because it indicates that the heart is beating at a
regular rate, which is defined by a narrow QRS complex and a distinct PR interval, both of which are within normal
limits. The presence of a P wave, which is upright, further supports this diagnosis by indicating that the heartbeat
originates from the sinus node and is not a result of an abnormal electrical conduction pathway.
QUESTION 2
Sinus Bradycardia
CORRECT ANSWER
Regular
Rate: <60
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
RATIONALE: The key concept in diagnosing Sinus Bradycardia is a heart rate slower than 60 beats per minute, which is
reflected in the given rate. The presence of a normal P wave and a narrow PR interval, along with a narrow QRS
complex, confirms that the slow heart rate originates from the sinoatrial (SA) node, making it a true sinus rhythm.
QUESTION 3
Sinus Tachycardia
CORRECT ANSWER
Regular
Rate: 100-150
P Wave: Present, upright
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, PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
RATIONALE: Sinus tachycardia is characterized by an elevated heart rate that is typically above 100 beats per minute,
with a P wave that is upright and present, indicating that the impulse is originating from the sinoatrial (SA) node. The
PR interval and QRS duration provided in the given answer are within normal ranges, consistent with the SA node's
normal conduction pathway and ventricular depolarization, further supporting the diagnosis of sinus tachycardia.
QUESTION 4
Premature Atrial Contraction
CORRECT ANSWER
IRREGULAR
Rate: depends on underlying rhythm
P wave: Present or hidden in T wave
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec
RATIONALE: A Premature Atrial Contraction (PAC) occurs when an ectopic atrial impulse triggers a heartbeat before the
next expected sinus beat, often disrupting the underlying rhythm, and as a result, the P wave may be hidden in the T
wave of the preceding beat or appear irregularly. This disrupts the normal sequence and timing of the cardiac electrical
conduction, explaining the irregular rate and altered intervals.
QUESTION 5
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