The rhythm is sinus but the pr interval is prolonged (greater than 200ms) and the QRS is wide (> 120ms). The loss of the septal Q waves and the tall broad R waves in leads I, aVL and V6 are diagnostic of a left bundle branch block.	Rate (/min)	49	QT (ms)	537
	pr (ms)	232	QRS axis (degrees)	0
	QRS (ms)	158