Sensing and atrial-synchronized ventricular pacing in an intracardiac pacemaker

摘要

An intracardiac pacemaker is configured to receive a cardiac electrical signal developed across a pair of electrodes coupled to the pacemaker and detect a crossing of a first sensing threshold of the cardiac electrical signal. A pacing escape interval timer is set to a first pacing escape interval in response to the cardiac electrical signal crossing the first sensing threshold. The pacing escape interval timer is adjusted if the cardiac electrical signal crosses a second sensing threshold during a time limit.

主权项

1. A medical device system, comprising:
an intracardiac pacemaker, the pacemaker comprising: a sensing module configured to receive a cardiac electrical signal and detect a crossing of a first sensing threshold by the cardiac electrical signal; a pulse generator configured to generate and deliver a pacing pulse to the patient's heart via a pair of electrodes, and a control module coupled to the sensing module and the pulse generator and configured to:
set a pacing escape interval timer to a first pacing escape interval in response to the cardiac electrical signal crossing the first sensing threshold,set a time limit in response to the cardiac electrical signal crossing the first sensing threshold, the time limit shorter than the first pacing escape interval;adjust the pacing escape interval timer in response to the cardiac electrical signal crossing a second sensing threshold higher than the first sensing threshold within the time limit; andcontrol the pulse generator to deliver the pacing pulse if the first pacing escape interval expires.