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Concealed Retrograde Conduction in Complete Atrioventricular Block

Atrio-ventricular (A-V) conduction and retrograde concealed conduction were assessed in 13 patients with complete heart block distal to the His bundle. Antegrade conduction was defined by His bundle study. The presence or absence of retrograde concealed conduction of the atrio-ventricular node was determined during ventricular pacing. Four instances of retrograde concealed conduction of the A-V node were observed.