Relias Dysrhythmia Basic Test (Basic A) 2025/2026 – 35 Questions and Answers

Relias Dysrhythmia Basic Test (Basic A)
2025/2026 – 35 Questions and Answers



Question 1
A patient’s ECG shows a heart rate of 80 bpm with normal P waves, QRS complexes, and T
waves, all evenly spaced. What is the rhythm?

A. Sinus Bradycardia
B. Normal Sinus Rhythm
C. Sinus Tachycardia
D. Atrial Fibrillation

Correct Answer: B. Normal Sinus Rhythm

Explanation/Rationale: Normal sinus rhythm is characterized by a heart rate of 60–100 bpm,
with regular P waves preceding each QRS complex, a normal PR interval (0.12–0.20 seconds),
and evenly spaced complexes. The described ECG matches these criteria, ruling out sinus
bradycardia (<60 bpm), sinus tachycardia (>100 bpm), and atrial fibrillation (irregular rhythm with
no distinct P waves).


Question 2
An ECG shows a heart rate of 50 bpm with normal P waves, QRS complexes, and T waves.
What is the rhythm?

A. Normal Sinus Rhythm
B. Sinus Bradycardia
C. Sinus Tachycardia
D. First-Degree AV Block

Correct Answer: B. Sinus Bradycardia

Explanation/Rationale: Sinus bradycardia is defined by a heart rate less than 60 bpm with
normal P waves, QRS complexes, and T waves, and regular rhythm. The heart rate of 50 bpm
fits this description. Normal sinus rhythm requires 60–100 bpm, sinus tachycardia >100 bpm,

, and first-degree AV block involves a prolonged PR interval (>0.20 seconds), which is not
indicated.


Question 3
A patient’s ECG shows a heart rate of 120 bpm with normal P waves, QRS complexes, and T
waves. What is the rhythm?

A. Normal Sinus Rhythm
B. Sinus Bradycardia
C. Sinus Tachycardia
D. Supraventricular Tachycardia

Correct Answer: C. Sinus Tachycardia

Explanation/Rationale: Sinus tachycardia is characterized by a heart rate of 101–200 bpm with
normal P waves, QRS complexes, and T waves, and regular rhythm. The heart rate of 120 bpm
fits this description. Normal sinus rhythm is 60–100 bpm, sinus bradycardia <60 bpm, and
supraventricular tachycardia typically has a rate >150 bpm with abnormal P waves or no visible
P waves.


Question 4
An ECG shows a regular rhythm with a heart rate of 90 bpm, but an early beat with an abnormal
P wave occurs. What is this rhythm?

A. Premature Atrial Contraction (PAC)
B. Premature Ventricular Contraction (PVC)
C. Atrial Fibrillation
D. Ventricular Tachycardia

Correct Answer: A. Premature Atrial Contraction (PAC)

Explanation/Rationale: A PAC is an early beat originating from the atria, characterized by an
abnormal P wave, normal QRS complex, and irregular rhythm due to the early beat. PVCs
originate from the ventricles with wide QRS complexes, atrial fibrillation lacks distinct P waves
and is irregular, and ventricular tachycardia involves rapid, wide QRS complexes.


Question 5
An ECG shows a heart rate of 180 bpm with regular rhythm and no visible P waves. What is the
rhythm?