Patent ID: 8868181

Claim:
An implantable cardiac electrostimulator comprising: an atrial sensing channel for processing intracardiac electrogram signals and for detecting signals corresponding to atrial activity and for generating an atrial sense event signal upon detection of a signal corresponding to atrial activity, a ventricular sensing channel for processing intracardiac electrogram signals and for detecting signals corresponding to ventricular activity and for generating a ventricular sense event signal upon detection of a signal corresponding to ventricular activity, a ventricular extrasystole (VES) detector being operatively connected to said atrial and ventricular sensing channels and being adapted to detect ventricular extrasystoles, an atrial stimulation pulse generator, a ventricular stimulation pulse generator, a stimulation control unit being operatively connected to said atrial stimulation pulse generator and said ventricular stimulation pulse generator, said stimulation control unit being adapted to: (1) determine a scheduled time of delivery of an atrial stimulation pulse (T(A)) and a scheduled time of delivery of ventricular stimulation pulse (T(V)), (2) trigger said atrial stimulation pulse generator or said ventricular stimulation pulse generator at the scheduled point of time T(A) or T(V), respectively, if no atrial sense event signal is generated before time out of an atrial escape interval (VAI), said atrial escape interval timing out at T(A), or if no ventricular sense event signal is generated before time out of a ventricular escape interval (VEI), said ventricular escape interval timing out at T(V), respectively, (3) modify T(A) and T(V) upon detection of a ventricular extra systole while maintaining a proper atrioventricular synchrony by setting a physiologically adequate A-V-delay between T(A) and corresponding T(V), and (4) respond to detection of the ventricular extra systole by setting a shortened interval between the ventricular extra systole and a subsequent T(A), and between the ventricular extra systole and a subsequent T(V), to a shorter interval of time than a base interval (BI), wherein the base interval BI at least approximates the interval between two consecutive T(A), and/or between two consecutive T(V), in the absence of a ventricular extra systole.