RELIAS DYSRHYTHMIA BASIC TEST LATEST 2026/2027 | MOST TESTED | 35
VERIFIED Q&A | BASIC A DYSRHYTHMIA | DETAILED RATIONALES | MULTIPLE-
CHOICE | NGN-ALIGNED | PASS GUARANTEED - A+ GRADED
How to Use This Study Guide
This guide provides 35 practice questions modeled on the Relias Dysrhythmia Basic A exam format, with
verified correct answers and detailed rationales. Use the systematic 5-step approach for each strip: Rate →
Regularity → P Wave → PR Interval → QRS Duration.
Question 1
A patient's cardiac monitor shows a heart rate of 42 bpm, no visible P waves, and a wide QRS complex (0.14
sec). What is the rhythm?
Correct Answer: C) Idioventricular rhythm
Rationale: Idioventricular rhythm occurs when the ventricles act as the pacemaker (rate 20–40 bpm, wide
QRS >0.12 sec, absent P waves). Junctional escape rhythm would have a narrow QRS (<0.12 sec) and
absent/inverted P waves. Atrial fibrillation would show an irregularly irregular rhythm with no P waves but a
narrow QRS.
Question 2
Which of the following findings is characteristic of Atrial Fibrillation?
Correct Answer: D) Irregularly irregular rhythm with no distinguishable P waves
Rationale: Atrial fibrillation is defined by an irregularly irregular ventricular response and the absence of
discernible P waves. Atrial activity is chaotic and fibrillatory, with varying baseline undulations.
Question 3
A patient has a heart rate of 110 bpm, a regular rhythm, and P waves are hidden in the T waves. What is the
most likely rhythm?
Correct Answer: B) Junctional Tachycardia
, RELIAS DYSRHYTHMIA BASIC TEST LATEST 2026/2027 | MOST TESTED | 35
VERIFIED Q&A | BASIC A DYSRHYTHMIA | DETAILED RATIONALES | MULTIPLE-
CHOICE | NGN-ALIGNED | PASS GUARANTEED - A+ GRADED
Rationale: Junctional tachycardia originates from the AV node with a rate >100 bpm, regular rhythm, and
absent or inverted P waves. If P waves are present, the PR interval is short (<0.12 sec). Sinus tachycardia
would have upright P waves before each QRS.
Question 4
Which ECG finding is diagnostic of First-Degree AV Block?
Correct Answer: A) PR interval >0.20 seconds consistently
Rationale: First-degree AV block is defined by a prolonged PR interval >0.20 sec with a 1:1 P:QRS ratio. The
rhythm is regular, and no QRS complexes are dropped.
Question 5
A patient's monitor shows a rhythm with PR intervals that progressively lengthen until a QRS is dropped. This
rhythm is:
Correct Answer: C) Second-Degree AV Block Type I (Wenckebach)
Rationale: Wenckebach (Mobitz Type I) is characterized by progressively prolonging PR intervals until a QRS
is dropped, then the cycle repeats. Type II has a constant PR interval with randomly dropped QRS complexes.
Question 6
What is the hallmark feature of Third-Degree (Complete) Heart Block?
Correct Answer: D) No relationship between P waves and QRS complexes
Rationale: In third-degree heart block, the atria and ventricles are dissociated; P waves have no correlation to
QRS complexes. The atrial rate is faster than the ventricular rate, and the ventricular rhythm is typically a
junctional or idioventricular escape rhythm.
VERIFIED Q&A | BASIC A DYSRHYTHMIA | DETAILED RATIONALES | MULTIPLE-
CHOICE | NGN-ALIGNED | PASS GUARANTEED - A+ GRADED
How to Use This Study Guide
This guide provides 35 practice questions modeled on the Relias Dysrhythmia Basic A exam format, with
verified correct answers and detailed rationales. Use the systematic 5-step approach for each strip: Rate →
Regularity → P Wave → PR Interval → QRS Duration.
Question 1
A patient's cardiac monitor shows a heart rate of 42 bpm, no visible P waves, and a wide QRS complex (0.14
sec). What is the rhythm?
Correct Answer: C) Idioventricular rhythm
Rationale: Idioventricular rhythm occurs when the ventricles act as the pacemaker (rate 20–40 bpm, wide
QRS >0.12 sec, absent P waves). Junctional escape rhythm would have a narrow QRS (<0.12 sec) and
absent/inverted P waves. Atrial fibrillation would show an irregularly irregular rhythm with no P waves but a
narrow QRS.
Question 2
Which of the following findings is characteristic of Atrial Fibrillation?
Correct Answer: D) Irregularly irregular rhythm with no distinguishable P waves
Rationale: Atrial fibrillation is defined by an irregularly irregular ventricular response and the absence of
discernible P waves. Atrial activity is chaotic and fibrillatory, with varying baseline undulations.
Question 3
A patient has a heart rate of 110 bpm, a regular rhythm, and P waves are hidden in the T waves. What is the
most likely rhythm?
Correct Answer: B) Junctional Tachycardia
, RELIAS DYSRHYTHMIA BASIC TEST LATEST 2026/2027 | MOST TESTED | 35
VERIFIED Q&A | BASIC A DYSRHYTHMIA | DETAILED RATIONALES | MULTIPLE-
CHOICE | NGN-ALIGNED | PASS GUARANTEED - A+ GRADED
Rationale: Junctional tachycardia originates from the AV node with a rate >100 bpm, regular rhythm, and
absent or inverted P waves. If P waves are present, the PR interval is short (<0.12 sec). Sinus tachycardia
would have upright P waves before each QRS.
Question 4
Which ECG finding is diagnostic of First-Degree AV Block?
Correct Answer: A) PR interval >0.20 seconds consistently
Rationale: First-degree AV block is defined by a prolonged PR interval >0.20 sec with a 1:1 P:QRS ratio. The
rhythm is regular, and no QRS complexes are dropped.
Question 5
A patient's monitor shows a rhythm with PR intervals that progressively lengthen until a QRS is dropped. This
rhythm is:
Correct Answer: C) Second-Degree AV Block Type I (Wenckebach)
Rationale: Wenckebach (Mobitz Type I) is characterized by progressively prolonging PR intervals until a QRS
is dropped, then the cycle repeats. Type II has a constant PR interval with randomly dropped QRS complexes.
Question 6
What is the hallmark feature of Third-Degree (Complete) Heart Block?
Correct Answer: D) No relationship between P waves and QRS complexes
Rationale: In third-degree heart block, the atria and ventricles are dissociated; P waves have no correlation to
QRS complexes. The atrial rate is faster than the ventricular rate, and the ventricular rhythm is typically a
junctional or idioventricular escape rhythm.
