Wolff-Parkinson-White Syndrome (WPW) is recognized as an abnormality of cardiac rhythm that manifests as supraventricular tachycardia. Few practitioners today appreciate how much the development of clinical cardiac electrophysiology owes to Wolff-Parkinson-White Syndrome. In the early 1960s, it became the test bed for electrophysiological theory and new therapies. Surgical electrophysiological techniques were developed, the pathways were severed,...