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Methods and devices for identifying overdetection of cardiac signals

  • US 8,437,838 B2
  • Filed: 09/07/2012
  • Issued: 05/07/2013
  • Est. Priority Date: 10/27/2009
  • Status: Active Grant
First Claim
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1. A method of operating an implantable cardiac system (ICS), the ICS comprising operational circuitry coupled to a plurality of implantable electrodes for sensing electric signals, the method comprising:

  • sensing signals from the electrodes;

    detecting events in the sensed signals;

    applying event and feature/proximity analysis rules to the detected events to identify overdetection of cardiac signals;

    performing ameliorative action in response to identified overdetection; and

    determining whether therapy is likely needed;

    wherein the event and feature/proximity analysis rules are applied across three detected events ([n−

    2], [n−

    1], [n]) as follows;

    identifying a late peak in detection [n−

    2], identifying an early peak and a late peak in detection [n−

    1] and identifying a detection time for event [n];

    measuring a first interval from the late peak of detection [n−

    1] to the detection time of event [n] and comparing the first interval to a t1 threshold;

    measuring a second interval from the late peak of detection [n−

    2] to the early peak of detection [n−

    1] and comparing the second interval to a t2 threshold; and

    the method further comprises, when the first interval is less than the t1 threshold and the second interval is less than the t2 threshold, identifying detection [n−

    1] as an overdetected event.

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