Echocardiography of ventricular septal movement in Wolff-Parkinson-White syndrome.

Four patients, three with type B Wolff-Parkinson-White Syndrome and right ventricular preexcitation and one with type A Wolff-Parkinson-White Syndrome with left ventricular preexcitation, were studied echocardiographically. One of the patients with type B Wolff-Parkinson-White Syndrome was also studied while in intermittent normal conduction and right ventricular posterior preexcitation. Three patients with right ventricular preexcitation demonstrated early posterior systolic ventricular septal motion shortly after the on set of the delta wave of the QRS complex and later systolic paradoxic ventricular septal motion. During normal conduction in the patient with intermitten right ventricular preexcitation the early systolic posterior septal movement disappeared and the later systolic septal movement became posterior; ventricular septal systolic movement became normal. The type a Wolff-Parkinson-White Syndrome patient demonstrated normal systolic ventricular septal movement while in preexcitation.