PMID: 3383869Mar 1, 1988Paper

Incidence of 'dual A-V nodal pathways' in first- and second-degree type I supra-His A-V block

European Heart Journal
M Di BiaseP Rizzon

Abstract

The incidence of 'dual A-V nodal pathways', diagnosed on the basis of spontaneous or induced modifications in the PR interval, has been assessed in a group of 168 consecutive patients with first- (77) and second-degree (91) type I supra-His block. 'Dual A-V nodal pathways' were found in 12 cases (16%) with first-degree and in 7 cases (7.7%) with second-degree type I supra-His A-V block. His bundle recording confirmed the hypothesis that PR interval variations observed in these cases are due to modifications in the AH interval and thus to changes in A-V nodal conduction velocity. The electrophysiologic study also showed that the phenomenon was easily reproduced by atrial stimulation. The frequent association between 'dual A-V nodal pathways' and supra-His blocks suggests that the block mechanism should be studied in depth as it could have prognostic and therapeutic implications.

Citations

Mar 12, 2013·Circulation. Arrhythmia and Electrophysiology·G Stuart MendenhallSamir Saba
Nov 19, 2020·Journal of Cardiovascular Electrophysiology·Xiaodong ZhangLuigi Di Biase

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