Abstract
We compared cardiac function and hemodynamics at VVI as well as DVI Pacing in patients after DDD Pacemaker implantation in 21 cases of Sick Sinus Syndrome and 9 cases of Complete Atrioventricular Block. 8 of 21 patients with Sick Sinus Syndrome showed retrograde conduction at VVI pacing. In the patients with retrograde conduction, at VVI pacing, the right atrial pressure was over 15mmHg, and cardiac output was too much decreased as venus return obstacle. In the right atrial mean pressure, VVI to DVI ratio was higher in the patients with Sick Sinus Syndrome without retrograde conduction than in the patients with complete atrioventricular block. This correlated with cardiac output, DVI to VVI ratio was higher in the patients with Sick Sinus Syndrome without retrograde conduction than in the patients with complete atrioventricular block. So we concluded that it is more necessary to do dual chamber pacing in the patients with Sick Sinus Syndrome than in the patients with complete atrioventricular block.
