Interpret the following rhythm:
A) Sinus rhythm with multifocal premature ventricular contractions
B) Sinus rhythm with unifocal premature ventricular contractions
C) Sinus rhythm with bigeminal premature ventricular contractions
D) Sinus rhythm with paired premature ventricular contractions (couplets)

Question

Interpret the following rhythm: 
A) Sinus rhythm with multifocal premature ventricular contractions 
B) Sinus rhythm with unifocal premature ventricular contractions 
C) Sinus rhythm with bigeminal premature ventricular contractions 
D) Sinus rhythm with paired premature ventricular contractions (couplets)

Quizplus · Accepted Answer

A single ectopic focus produces PVC waveforms that look alike,called unifocal PVCs.Waveforms of PVCs arising from multiple foci are not identical and are called multifocal PVCs.
PVCs may occur in a predictable pattern,such as every other beat (bigeminal),every third beat (trigeminal),or every fourth beat (quadrigeminal).PVCs can also occur sequentially.Two PVCs in a row are called a pair (couplet),and three or more in a row are called nonsustained ventricular tachycardia.

Interpret the Following Rhythm