Retrograde Conduction from Premature Ventricular Contractions, a Common Occurrence in the Human Heart

Abstract

On the basis of studies of esophageal electrocardiograms the authors conclude that retrograde conduction to the atria from premature ventricular beats is common and that the theory of normal unidirectional block in the A-V node is not tenable. In most of the cases with retrograde conduction, the latter is not discernible in simultaneously recorded lead II, which explains why the phenomenon has previously been considered rare. Observations on the ventriculoatrial conduction time and the compensatory pause are presented. In two of the cases there are two orders of magnitude of ventriculoatrial conduction time, which, the authors postulate, may be due to two separate pathways of retrograde conduction.