This recording shows a positive delta waves in I and aVL, as well as V4 to V6. The pr interval is short (<120ms.) This is suggestive of a right free wall atrio-ventricular bypass tract of the W.P.W. type.	Rate (/min)	64	QT (ms)	413
	pr (ms)	100	QRS axis (degrees)	-53
	QRS (ms)	129