An Interesting Case of Type A Wolff-Parkinson-White Syndrome

A case of Wolff-Parkinson-White syndrome who presented with a tachycardia showing an unusual QRS morphology closely resembling that of a ventricular tachycardia was reported. It showed type A or type B conduction of the Wolff-Parkinson-White syndrome in electrocardiogram in different time, but vectorcardiogram showed always type A conduction. After combinated administration of Quinidine and Reserpine, ECG reversed constantly to normal sinus rhythm.