WPW Diagram-KH
Frank G. Yanowitz, M.D.,
copyright 1997
The short PR interval is due to a bypass track, also known as the Kent pathway. By bypassing the AV node the PR shortens. The delta wave represents early activation of the ventricles
from the bypass tract. The fusion QRS is the result of two activation sequences, one from the
bypass tract and one from the AV node. The ST-T changes are secondary to changes in the
ventricular activation sequence.