Relias Dysrhythmia Basic Test B Answers & Study Guide 2026 | Advanced ECG Interpretation & Clinical Interventions

Relias Dysrhythmia Basic Test B Answers &
Study Guide 2026 | Advanced ECG Interpretation
& Clinical Interventions

1. A rhythm strip shows a regular rate of 52, a PR interval of 0.18, and a QRS of 0.08.
This is:
A) Sinus Tachycardia
B) Normal Sinus Rhythm
C) Sinus Bradycardia
D) Junctional Rhythm
Answer: C
Explanation: The measurements are normal (PRI 0.12–0.20, QRS < 0.12), but the
rate is below the 60 bpm threshold for Sinus Bradycardia.

2. Which of the following is the hallmark of Atrial Fibrillation?
A) Sawtooth waves
B) An irregularly irregular rhythm with no discernible P waves
C) A PR interval greater than 0.20 seconds
D) Presence of a delta wave
Answer: B
Explanation: A-Fib is characterized by a chaotic atrial baseline (fibrillatory waves)
and an unpredictable R-R interval.

3. The PR interval is measured from the:
A) Beginning of the P wave to the beginning of the QRS complex
B) End of the P wave to the beginning of the QRS
C) Peak of the P wave to the R wave
D) Beginning of the QRS to the end of the T wave
Answer: A
Explanation: This represents the time required for atrial depolarization and the
delay in the AV node.

4. Which rhythm presents with a "sawtooth" pattern of F waves?
A) Atrial Fibrillation