Abstract
Spontaneous ventricular extrasystoles (V3-beats) occur frequently after premature ventricular stimuli induced during a paced ventricular rhythm. The V3 phenomenon was observed in 100 of 158 patients (63.3%) with and without heart disease being studied for the evaluation of various rhythm disorders. In patients with an old myocardial infarction there was an increased tendency to exhibit short ventricular salvos (V3–V5 beats) after prematurely elicited test pulses. V3-beats occurred less frequently in patients with a bundle branch block than in patients with normal intraventricular conduction.
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