Aberrant propagation of a supraventricular impulse through the ventricle occurs commonly. In vivo studies on canine hearts by Moe et al. established indirectly that, during functional right bundle branch block (FRBBB), the impulse blocked in the early portion of the right bundle branch system. Electrode catheter recordings obtained in patients support this experimental observation. However, Myerburg et al. determined in vitro that cells which exhibited the longest action potential and refractory period duration were located 2 to 3 mm proximal to the termination of the false tendon in ventricular endocardium, and that conduction block could be produced at this site ('gates'). This study was designed to record directly the site of FRBBB produced in the intact canine heart.
|Original language||English (US)|
|Number of pages||10|
|State||Published - Jan 1 1975|
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine