Dual chamber cardiac pacemaker employing hysteresis to maximize the number of normally conducted ventricular beats with an optimum A-V delay for paced ventricular beats

摘要: A DDD pacemaker including stimulating means to stimulate the ventricles of a heart after predetermined A-V delay period includes for adjusting enhance probability detecting naturally occurring ventricular depolarization signals when such are being detected at rate and switching more hemodynamically appropriate paced beats predominate. The invention is implemented in software run on microprogrammable controller comprising pacemaker.