Wolff-Parkinson-White syndrome represents a congenital abnormality involving the heart's electrical function.

Although many people with Wolff-Parkinson-White syndrome exhibit no symptoms, it can result in episodes of rapid heartbeat. These episodes are called paroxysmal supraventricular tachycardia (PSVT). In PSVT, instead of a normal 60 to 80 beats per minute, the rate rises generally to 180 to 240 per minute.

Wolff-Parkinson-White syndrome is caused by abnormal conduction of electrical signals...