Localization of A-V conduction defects in man by recording of the his bundle electrogram

Onkar S. Narula, Lawrence Sanford Cohen, Philip Samet, John W. Lister, Benjamin Scherlag, Frank J. Hildner

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

His bundle electrograms were recorded in 20 patients. Conduction times from atrium to His bundle (A-H time) and His bundle to ventricle (H-V time) were measured and the sites of delay or block were localized to the proximal or distal A-V junction. On progressively increasing the atrial rate by atrial pacing, the A-H time lengthened, while the H-V time remained constant. Premature atrial beats usually resulted in prolongation of the A-H time only. In some instances, premature atrial beats also resulted in prolongation of the H-V time and aberrant ventricular conduction (change in configuration of the QRS complex). In patients with first degree heart block during sinus rhythm the A-H time was prolonged and the H-V time was either normal or prolonged. In higher degrees of heart block, the block was localized either in the proximal or distal A-V junction.

Original languageEnglish (US)
Pages (from-to)228-237
Number of pages10
JournalThe American Journal of Cardiology
Volume25
Issue number2
DOIs
StatePublished - Feb 1970

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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