His bundle recordings in diagnosis of impulse formation in Kent and Mahaim tracts

Agustin Castellanos, Ruey J. Sung, Cesar A. Castillo, Abdul S. Agha, Benjamin Befeler, Robert J. Myerburg

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5 Scopus citations

Abstract

His bundle electrograms were recorded in 2 patients with ectopic beats arising in accessory atrioventricular tracts. Case 1 had Wolff-Parkinson-White (WPW) type A and a left-sided Kent tract with a short effective refractory period. Though ectopic impulse formation most probably occurred within the Kent tract itself, a vulnerability-related origin in the ventricular muscle close to the distal end of the Kent tract could not be excluded. In Case 2, with a Mahaim tract extending from His bundle to ventricles, there were three types of QRS morphologies resulting from: (a) atrioventricular conduction exclusively through the normal pathway; (b) atrioventricular conduction through both, normal pathway, and Mahaim tract; and (c) ectopic impulse formation in the Mahaim tract. Specialized electrophysiological studies were essential to diagnose these unusual arrhythmias.

Original languageEnglish (US)
Pages (from-to)1173-1178
Number of pages6
JournalHeart
Volume38
Issue number11
DOIs
StatePublished - 1976

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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    Castellanos, A., Sung, R. J., Castillo, C. A., Agha, A. S., Befeler, B., & Myerburg, R. J. (1976). His bundle recordings in diagnosis of impulse formation in Kent and Mahaim tracts. Heart, 38(11), 1173-1178. https://doi.org/10.1136/hrt.38.11.1173