1960 Volume 1 Issue 3 Pages 275-287
By depressing the A-V conduction system with procain-amide, the retrograde impulse of the ventricular extrasystole was sometimes blocked or followed by a reciprocal beat. The relation between the coupling time and the kinds of extrasystoles was examined. The retrograde conduction time of the ventricular extrasystoles with reciprocal beats had negative correlation with the coupling time and the antegrade conduction time of the reciprocal beat. Similar relations were found in the experiments of the reversed reciprocal rhythm, although it was far more difficult to produce this arrhythmia under the sinus rhythm.
