Changing QRS Complex Morphology

Question

Why is the QRS complex morphology changing?

A) Intermittent Wolff-Parkinson-White (WPW) syndrome

B) Intermittent accelerated idioventricular rhythm

C) Intermittent left bundle branch block

Medscape Cardiology © 2007  Medscape

Cite this: Changing QRS Complex Morphology - Medscape - Dec 14, 2007.