Prolongation of timing intervals in response to ectopic heart beats in atrial and ventricular pacemakers

摘要

A programmable pacemaker pulse generator capable of operating in several atrial and ventricular pacing modes, having atrial and ventricular sense amplifiers and output circuits and programmable memory and clock controlled digital timing circuits for selectively delivering stimulating pulses to the heart in an atrial synchronous mode of operation. The ventricular sense amplifier has a blanking and refractory period following the sensing of a ventricular heartbeat or the occurrence of a stimulation pulse. Delay means are operatively connected to the atrial sense amplifier operate to trigger the generation of a ventricular stimulating pulse after an A-V delay interval following a sensed atrial depolarization.PPAn atrial blanking interval extends for the A-V delay interval and until after the expiration of the ventricular blanking interval. Programmable upper date intervals are also provided. PPThe ventricular amplifier output is sampled after a test interval shorter than the above mentioned intervals, and if an output signal persists, then all of the aforementioned intervals are prolonged by the interval of the persisting signal.