Observations on the effect of atrial systole in man.

Abstract

Abstract A quantitative study of the hemodynamic effects of atrial systole was carried out on eight subjects with functioning atrioventricular conduction and on five patients with complete A-V block. Cardiac function was altered by right ventricular, right atrial, and synchronous pacemaking. A statistically significant reduction in cardiac output was found during ventricular paying when compared to atrial pacing or sinus rhythm at the same rates in seven subjects (19.6 ± 6.4 per cent, p