Key result
Ventricular pacing reveals retrograde concealed AV node conduction in ~31% of distal complete heart block cases.
Observational (n=13)
Retrograde concealed conduction of the A-V node can occur during ventricular pacing in a subset of patients with complete heart block distal to the His bundle.
Does not support changes in pacing practice for complete heart block; leaves open prevalence and clinical relevance in larger cohorts.
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.
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Cohen et al. (1974) conducted an observational in Complete heart block distal to the His bundle (n=13). Ventricular pacing was evaluated on Presence of retrograde concealed conduction of the atrio-ventricular node. Retrograde concealed conduction of the A-V node was observed during ventricular pacing in 30.8% of patients with complete heart block distal to the His bundle.
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