Multiple electrophysiologic manifestations and clinical implications of vagally mediated AV block

Liaqat Zaman, Federico Moleiro, John J. Rozanski, Richard Pozen, Robert J. Myerburg, Agustin Castellanos

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Clinical, surface ECG, and intracardiac findings were analyzed in 20 patients with spontaneous conduction disturbances in whom vagaily mediated AV block could be induced by carotid sinus pressure during electrophysiologic evaluation. The latter demonstrated that the surface ECG pattern attributed to bradycardia-dependent (phase 4), and paroxysmal block within the His bundle and bundle branches could reflect vagally mediated, bradycardia-associated (rather than bradycardia-dependent), and paroxysmal AV nodal (AH) block. The decision regarding the use of pacemakers was not based on QRS duration or on patterns (or site) of block but on the underlying clinical settings and the correlation of symptoms with maximal ventricular (R-R) pauses. However, more studies are required to extend our findings, especially to other subgroups of patients (or normal individuals) in whom vagally mediated block occurs.

Original languageEnglish (US)
Pages (from-to)92-99
Number of pages8
JournalAmerican Heart Journal
Issue number1 PART 1
StatePublished - Jul 1983

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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