Patent ID: 8073536

Claim:
A method of determining undersensing during post-processing of sensing data generated by and stored within an implantable medical device, comprising: receiving the sensing data from the implantable medical device with an external access device, wherein the sensing data includes sensed atrial events and sensed ventricular events; determining, with the external access device, in response to the received data instances where the implantable medical device identified a cardiac event being detected in response to the sensing data; and determining, with the external access device, whether one of a predetermined number of undersensing criteria have been met in response to the received data, wherein determining whether one of a predetermined number of undersensing criteria have been met comprises: calculating a median AA interval in a sliding window of a predetermined number of intervals; comparing at least one interval within the sliding window to the median AA interval; determining whether there are two or less intervals in the received data that are two times the median AA interval; determining whether there are any intervals in the received data that are three times the median AA interval; determining whether a majority of the AA intervals are regular; and determining whether there is a depolarization on a corresponding atrial EGM signal where a corresponding expected atrial event would have occurred for any of the intervals that are two or three times the median AA interval.