A dual-chamber implantable pacemaker having an adaptive AV interval that prevents ventricular fusion pulse

摘要

How ventricular stimulation pulses generated by the pacemaker at the end of the AV interval that is defined by the pacemaker, the AV interval (57) is [summary] dual-chamber implantable pacemaker also a fusion of the natural ventricular depolarization of the patient''s heart is adjusted to occur at the time of the cardiac cycle to avoid. The AV interval, use the search sequence to change incrementally the AV interval value until it is crossover and natural conduction time interval, and also set to one side or the other of the natural conduction time of the heart AV interval value It is set in. Crossover point is revealed by the absence of R-wave if an R-wave had previously existed addition, the occurrence of the R-wave if an R-wave was not present previously. AV interval value of the final then be adjusted by adding thereto an AV margin, is set as the AV interval value at the cross-over point. Always search sequence indicates the change of sufficient natural conduction time the presence or absence of a sudden R-wave or is detected to cross over the AV interval existing when the search predetermined time has elapsed I always caused sometimes. Search sequence if caused too frequently, then it is automatically put on hold pending for a predetermined period.