Relias Dysrhythmia Basic A Exam Guide 2026: ECG Rhythms, Interpretation & Answer Key

Relias Dysrhythmia Basic A Exam Updated
2026/2027 Questions With Answers

1. Normal sinus rhythm - ANSWER-Regular
Rate: 60-100
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec

2. Sinus Bradycardia - ANSWER-Regular
Rate: <60
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec

3. Sinus Tachycardia - ANSWER-Regular
Rate: 100-150
P Wave: Present, upright
PR Interval: 0.12-0.20 sec
QRS: <0.12 sec

4. Premature Atrial Contraction - 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

5. Atrial Fibrillation - ANSWER-IRREGULAR
Atrial rate: UNMEASURABLE
Ventricular rate: variable
P wave: unable to see
PR Interval: N/A
QRS: <0.12 sec

6. A fib RVR - ANSWER-IRREGULAR
Ventricular rate: 100-175
P wave: unable to see
PR Interval: N/A
QRS <0.12 sec

7. Atrial Flutter - ANSWER-Usually REGULAR can be irregular
Atrial rate: 250-350
Ventricular rate: variable BUT < atrial rate
P Wave: Flutter

, PR Interval: N/A
QRS: <0.12 sec

8. Supraventricular Tachycardia - ANSWER-Regular
Rate: 150-350
P wave: Hidden in QRS or T wave
PR: unable to determine
QRS: <0.12 sec

9. Junctional Rhythm - ANSWER-Regular
Rate: 40-60
P Wave: ABSENT or INVERTED
PR Interval: None or <0.12
QRS: <0.12 sec

10. Accelerated Junctional Rhythm - ANSWER-Regular
Rate: 60-100
P Wave: NONE or INVERTED
PR Interval: None or <0.12
QRS: <0.12 sec

11. Junctional Tachycardia - ANSWER-Regular
Rate: >100
P Wave: NONE or INVERTED
PR Interval: None or <0.12
QRS: <0.12 sec

12. Premature Ventricular Contraction - ANSWER-IRREGULAR
Rate: refer to underlying rhythm
P Wave: NONE
PR Interval: N/A
QRS: WIDE and BIZARRE , >0.12 sec

13. Ventricular Tachycardia - ANSWER-Regular
Rate: >100
P Wave: NONE
PR Interval: N/A
QRS: WIDE and BIZARRE, >0.12 sec

14. Ventricular Fibrillation - ANSWER-Chaotic
Coarse: big waves
Fine: small waves
Rate: unmeasurable
P Wave: NONE
PR Interval: N/A
QRS: N/A