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 language | English (US) |
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Pages (from-to) | 1173-1178 |
Number of pages | 6 |
Journal | Heart |
Volume | 38 |
Issue number | 11 |
DOIs | |
State | Published - 1976 |
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine