[Supraventricular tachycardia caused by dual conduction paths in the atrioventricular junction].

An intracardiac electrophysiological study of 23 patients with a history of frequent attacks of supraventricular tachycardia showed that one of the underlying mechanisms of tachycardia development was reciprocation in the atrioventricular conjunction caused by binary conduction occurring in this structure (longitudinal dissociation). Two electrophysiological variants of reciprocal atrioventricular tachycardia were identified, namely ortho- and antidromal. The electrophysiological criteria for the diagnosis of both variants of reciprocal atrioventricular tachycardias are presented.