Patent ID: 9592392
Date: 2017-03-14
CPC Classifications: A61B,A61N

Claim:
1. A method for use in an implanted medical device, the method comprising: producing a filtered cardiac electrical signal using an adjustable filter within a sensing module by filtering a raw cardiac electrical signal received from implanted electrodes operably connected to the sensing module, 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.