Atrioventricular nodal reentrant tachycardia and the dilemma of reentry circuit components: A proof of concept

摘要

Upper common pathway (UCP) Wenckebach phenomenon during atrioventricular nodal reentrant tachycardia. A: Wenckebach cycle to the atria at UCP. Surface electrocardiography shows a progressive increase in RP interval (black arrows) until a P wave blocks in the UCP. B: Wenckebach cycle illustration in UCP: green arrows indicate conduction by the fast pathway and red irregular arrows conduction by the slow pathway. Straight black arrows represent depolarization of UCP and wavy lines represent impulse block. AVN = atrioventricular node; HB = His bundle; LCP = lower common pathway.