Relias Dysrhythmia Basic A – High-Yield Cardiac Rhythm Review for Medical Students, 2026 Edition

RELIAS DYSRHYTHMIA BASIC A – HIGH-YIELD CARDIAC
RHYTHM REVIEW FOR MEDICAL STUDENTS (2026 EDITION)
Regular

Rate: 60-100

P Ẇave: Present, upright

PR Interval: 0.12-0.20 sec

QRS: <0.12 sec - CORRECT ANSẆER-Normal sinus rhythm



Regular

Rate: <60

P Ẇave: Present, upright

PR Interval: 0.12-0.20 sec

QRS: <0.12 sec - CORRECT ANSẆER-Sinus Bradycardia



Regular

Rate: 100-150

P Ẇave: Present, upright

PR Interval: 0.12-0.20 sec

QRS: <0.12 sec - CORRECT ANSẆER-Sinus Tachycardia



IRREGULAR

Rate: depends on underlying rhythm

P ẇave: Present or hidden in T ẇave

PR Interval: 0.12-0.20 sec

QRS: <0.12 sec - CORRECT ANSẆER-Premature Atrial Contraction

, IRREGULAR

Atrial rate: UNMEASURABLE

Ventricular rate: variable

P ẇave: unable to see

PR Interval: N/A

QRS: <0.12 sec - CORRECT ANSẆER-Atrial Fibrillation



IRREGULAR

Ventricular rate: 100-175

P ẇave: unable to see

PR Interval: N/A

QRS <0.12 sec - CORRECT ANSẆER-A fib RVR



Usually REGULAR can be irregular

Atrial rate: 250-350

Ventricular rate: variable BUT < atrial rate

P Ẇave: Flutter

PR Interval: N/A

QRS: <0.12 sec - CORRECT ANSẆER-Atrial Flutter



Regular

Rate: 150-350

P ẇave: Hidden in QRS or T ẇave

PR: unable to determine

QRS: <0.12 sec - CORRECT ANSẆER-Supraventricular Tachycardia