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Method and apparatus for post-processing of episodes detected by a medical device

  • US 8,073,536 B2
  • Filed: 11/28/2006
  • Issued: 12/06/2011
  • Est. Priority Date: 11/28/2005
  • Status: Active Grant
First Claim
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1. 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.

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