Macro-Reentry Within the His Purkinje System.

Deals with a form of reentry during which both of the bundle of His and ventricular myocardium are incorporated in the circuit. Mechanism involved in macro-entry His Purkinje system; Distinction of macro reentry His Purkinje system from other reentrant phenomenon following paced ventricular premature stimulation; Longitudinal dissociation within the bundle branches; Electrophysiologic criteria used in identifying ventricular echo and atrioventricular nodal reentry.