Relias Dysrhythmia Basic A Test (Practice Version)
2025/2026 Edition 55 Verified-Style Study Questions &
Rationales
Section 1: Exam Questions
Question 1:
An ECG strip shows a regular rhythm with a heart rate of 48 bpm, P waves before each QRS, and a PR
interval of 0.16 seconds. What is the rhythm?
A. Sinus tachycardia
B. Sinus bradycardia
C. Atrial fibrillation
D. First-degree AV block
Rationale:
A heart rate below 60 bpm with regular P waves, a normal PR interval (0.12–0.20 seconds), and one P
wave before each QRS indicates sinus bradycardia.
✅ Correct Answer: B. Sinus bradycardia
Question 2:
A client’s ECG shows a heart rate of 120 bpm, regular rhythm, and visible P waves before each QRS.
What is the rhythm?
A. Sinus tachycardia
B. Supraventricular tachycardia
C. Atrial flutter
D. Ventricular tachycardia
Rationale:
A regular rhythm with a rate of 100–150 bpm and P waves preceding each QRS complex indicates sinus
tachycardia.
✅ Correct Answer: A. Sinus tachycardia
Question 3:
An ECG strip shows no discernible P waves, irregularly irregular QRS complexes, and a ventricular rate of
approximately 100 bpm. What is the rhythm?
A. Sinus arrhythmia
B. Atrial fibrillation
, C. Atrial flutter
D. Junctional rhythm
Rationale:
Absent P waves and irregular QRS complexes signify chaotic atrial electrical activity — the hallmark of
atrial fibrillation.
✅ Correct Answer: B. Atrial fibrillation
Question 4:
A client with sinus bradycardia (HR 45 bpm) is asymptomatic. What is the nurse’s priority action?
A. Administer atropine
B. Monitor the client
C. Prepare for pacing
D. Notify the provider immediately
Rationale:
If the client is asymptomatic, no immediate treatment is needed. Continue to monitor and observe for
changes. Treatment such as atropine or pacing is indicated only for symptomatic bradycardia.
✅ Correct Answer: B. Monitor the client
Question 5:
A client’s ECG reveals a heart rate of 75 bpm, regular rhythm, PR interval of 0.22 seconds, and each P
wave followed by a QRS complex. What is the rhythm?
A. Sinus rhythm
B. First-degree AV block
C. Second-degree AV block Type I
D. Junctional rhythm
Rationale:
A prolonged PR interval (>0.20 seconds) with otherwise normal conduction and consistent P-QRS
association indicates first-degree AV block.
✅ Correct Answer: B. First-degree AV block
Question 6:
An ECG strip shows a rate of 82 bpm, regular rhythm, normal P waves, PR interval of 0.16 seconds, and
QRS duration of 0.08 seconds. What is the interpretation?
A. Normal sinus rhythm
B. Sinus bradycardia
2025/2026 Edition 55 Verified-Style Study Questions &
Rationales
Section 1: Exam Questions
Question 1:
An ECG strip shows a regular rhythm with a heart rate of 48 bpm, P waves before each QRS, and a PR
interval of 0.16 seconds. What is the rhythm?
A. Sinus tachycardia
B. Sinus bradycardia
C. Atrial fibrillation
D. First-degree AV block
Rationale:
A heart rate below 60 bpm with regular P waves, a normal PR interval (0.12–0.20 seconds), and one P
wave before each QRS indicates sinus bradycardia.
✅ Correct Answer: B. Sinus bradycardia
Question 2:
A client’s ECG shows a heart rate of 120 bpm, regular rhythm, and visible P waves before each QRS.
What is the rhythm?
A. Sinus tachycardia
B. Supraventricular tachycardia
C. Atrial flutter
D. Ventricular tachycardia
Rationale:
A regular rhythm with a rate of 100–150 bpm and P waves preceding each QRS complex indicates sinus
tachycardia.
✅ Correct Answer: A. Sinus tachycardia
Question 3:
An ECG strip shows no discernible P waves, irregularly irregular QRS complexes, and a ventricular rate of
approximately 100 bpm. What is the rhythm?
A. Sinus arrhythmia
B. Atrial fibrillation
, C. Atrial flutter
D. Junctional rhythm
Rationale:
Absent P waves and irregular QRS complexes signify chaotic atrial electrical activity — the hallmark of
atrial fibrillation.
✅ Correct Answer: B. Atrial fibrillation
Question 4:
A client with sinus bradycardia (HR 45 bpm) is asymptomatic. What is the nurse’s priority action?
A. Administer atropine
B. Monitor the client
C. Prepare for pacing
D. Notify the provider immediately
Rationale:
If the client is asymptomatic, no immediate treatment is needed. Continue to monitor and observe for
changes. Treatment such as atropine or pacing is indicated only for symptomatic bradycardia.
✅ Correct Answer: B. Monitor the client
Question 5:
A client’s ECG reveals a heart rate of 75 bpm, regular rhythm, PR interval of 0.22 seconds, and each P
wave followed by a QRS complex. What is the rhythm?
A. Sinus rhythm
B. First-degree AV block
C. Second-degree AV block Type I
D. Junctional rhythm
Rationale:
A prolonged PR interval (>0.20 seconds) with otherwise normal conduction and consistent P-QRS
association indicates first-degree AV block.
✅ Correct Answer: B. First-degree AV block
Question 6:
An ECG strip shows a rate of 82 bpm, regular rhythm, normal P waves, PR interval of 0.16 seconds, and
QRS duration of 0.08 seconds. What is the interpretation?
A. Normal sinus rhythm
B. Sinus bradycardia
