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Method and apparatus for verifying a determined cardiac event in a medical device based on detected variation in hemodynamic status

  • US 7,647,095 B2
  • Filed: 04/28/2006
  • Issued: 01/12/2010
  • Est. Priority Date: 03/31/2006
  • Status: Active Grant
First Claim
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1. A medical device comprising:

  • a plurality of sensors configured to sense cardiac signals;

    a physiologic sensor sensing physiologic signals configured to generate a plurality of oxygen (O2) variation index samples corresponding to the sensed signals; and

    a microprocessor configured to;

    detect a cardiac event in response to the sensed cardiac signals;

    compute an O2 variation index trend associated with a predetermined number of O2 variation index samples of the plurality of O2 variation index samples in response to the detected cardiac event;

    determine, in response to the O2 variation index trend being less than a variation index trend threshold, whether a rate of change of the O2 variation index trend is within a predetermined cardiac event zone defined by a first zone threshold having a first rate of change corresponding to the O2 variation index trend becoming less than the variation index trend threshold in a first period of time and a second zone threshold having a second rate of change corresponding to the O2 variation index trend becoming less than the variation index trend threshold in a second period of time greater than the first period of time;

    and confirm the determined detected cardiac event in response to both the computed O2 variation index trend being less than the variation index trend threshold and the rate of change of the O2 variation index trend being within the predetermined cardiac event zone.

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