SENSING AND ATRIAL-SYNCHRONIZED VENTRICULAR PACING IN AN INTRACARDIAC PACEMAKER

摘要

A pacemaker implantable in a chamber of a patient's heart is configured to produce a filtered cardiac electrical signal by filtering a raw cardiac signal by an adjustable filter of a sensing module of the pacemaker. The sensing module is configured to receive the raw cardiac electrical signal comprising R-waves, T-waves and P-waves via electrodes coupled to the sensing module. The pacemaker is further configured to determine if the T-waves are distinct from the P-waves in the filtered cardiac electrical signal and adjust the filter to increase a difference between a feature of the P-waves and a feature of the T-waves in the filtered cardiac signal when the T-waves are not distinct from the P-waves.

主权项

1. A method, comprising:
producing a filtered cardiac electrical signal by filtering a raw cardiac electrical signal by an adjustable filter of a sensing module of a medical device configured to receive the raw cardiac electrical signal, the raw cardiac electrical signal comprising R-waves, T-waves and P-waves via electrodes coupled to the sensing module; determining if the T-waves are distinct from the P-waves in the filtered cardiac electrical signal; adjusting the filter to increase a difference between a feature of the P-waves and a feature of the T-waves in the filtered cardiac signal when the T-waves are not distinct from the P-waves; determining P-wave sensing criteria based on the difference; sensing a P-wave from the filtered cardiac electrical signal when the P-wave sensing criteria are met; and setting a ventricular pacing escape interval in response to sensing the P-wave.