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Method and apparatus for identifying oversensing using far-field intracardiac electrograms and marker channels

  • US 20060235476A1
  • Filed: 04/18/2005
  • Published: 10/19/2006
  • Est. Priority Date: 04/18/2005
  • Status: Active Grant
First Claim
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1. A method of detecting the occurrence of intrinsic depolarizations of a heart chamber comprising:

  • obtaining a far-field electrogram (FF EGM) signal comprising a stream of digital sample points;

    identifying possible intrinsic depolarizations by applying amplitude change criteria to subsets of the stream of digital sample points, the subsets comprising at least 3 digital sample points within the stream;

    removing possible intrinsic depolarizations with amplitudes below an amplitude threshold criterion from further consideration as possible intrinsic depolarizations;

    removing possible intrinsic depolarizations that occur within a blanking interval period immediately after a preceding intrinsic depolarization; and

    marking the remaining possible intrinsic depolarizations as sensed events from the FF EGM signal.

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