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Implantable medical device with real time T-wave oversensing detection

  • US 8,942,795 B2
  • Filed: 03/31/2005
  • Issued: 01/27/2015
  • Est. Priority Date: 03/31/2005
  • Status: Active Grant
First Claim
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1. A method of controlling ventricular tachycardia (VT) and ventricular fibrillation (VF) detection in an implantable medical device, the method comprising:

  • sensing R-waves in a ventricular electrogram (EGM) signal;

    obtaining time intervals between successive sensed R-waves;

    monitoring a plurality of characteristics indicative of T-wave oversensing;

    wherein monitoring the plurality of characteristics comprises maintaining a first count to track a number of occurrences of large successive interval differences and maintaining a second count to track a number of occurrences of a current time interval being approximately equal to a sum of two preceding time intervals, andwithholding detection of a VT or VF in response to the first count and second count indicating presence of oversensed T-waves among the sensed R-waves.

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