Premature Ventricular Complex (PVC) 

Sinus with Multifocal PVCs

A ventricular depolarization that occurs earlier than expected. It appears on the ECG as an early, wide QRS complex without a preceding related P wave. PVCs may be idiopathic or caused by stress, electrolyte imbalance, ischemia, hypoxemia, hypercapnia, ventricular enlargement, or a toxic reaction to drugs. Frequent PVCs may be a precursor of ventricular tachycardia or fibrillation. Mosby (2009-02-11).


Rate Usually within normal range but depends on underlying rhythm

Rhythm Regular with premature beats 

P-Waves May occur before during or after the QRS. If visible, the P wave is inverted in leads 2, 3 and aVF

PR Interval If a P wave occurs before the QRS the PR Interval will be 0.12 sec (3small boxes) or less

QRS Duration 0.11 seconds (2 1⁄2 small boxes) or less


Monitor Diagnostic 12 lead 

Usually requires no treatment



Noticeable by: 

Occurring earlier than the next expected beat. If visible, the P wave is inverted in leads 2, 3 and aVF 

© Matt Dillard 2012