Supraventricular tachycardia from a left bundle branch block - an unusual presentation of Wolff-Parkinson-White syndrome

Wolff-Parkinson-White syndrome [WPW] is an electrocardiographic diagnosis based on a short PR interval with the presence of a delta wave, but it can mimic a variety of electrocardiographic conditions. We present a case in a 6-year-old Saudi female whose WPW was easily mistaken as a left bundle branch block