Abstract
Systolic time intervals were measured in 15 patients with complete heart block and fixed rate ventricular pacing during supine position and 60° leg elevation. Twelve patients had independent atrial activity appearing at variable relationship to ventricular beats. Three patients were in atrial fibrillation. Systolic time interval ratio PEP/LVET, ejection fraction and derived stroke volume measured from ventricular beats preceded by atrial activity at various PR interval between 0.10 to 0.50 sec were compared to those without atrial activity in the same patient and those in atrial fibrillation.
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