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Methods and devices for accurately classifying cardiac activity

  • US 9,162,074 B2
  • Filed: 11/24/2014
  • Issued: 10/20/2015
  • Est. Priority Date: 03/07/2008
  • Status: Active Grant
First Claim
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1. An implantable cardiac stimulus device (ICSD) comprising the following:

  • a canister housing operational circuitry; and

    a lead electrode assembly including a plurality of electrodes disposed thereon;

    wherein with the lead electrode assembly is configured to couple to the canister to electrically couple the operational circuitry to the electrodes on the lead electrode assembly;

    the operational circuitry being configured to perform a method of cardiac signal analysis comprising;

    the operational circuitry detecting a series of events;

    the operational circuitry comparing the detected events to a morphology template to establish a series of correlation scores indicative of the extent of correlation between the shape of detected events and the morphology template;

    the operational circuitry analyzing the series of correlation scores to observe a high-low-high pattern of;

    a first-most recent event having a high correlation score;

    a second-most recent event having a low correlation score; and

    a third-most recent event having a high correlation score;

    when the high-low-high pattern is identified, the operational circuitry determining that the second-most recent event is an overdetection;

    upon finding an overdetection, the operational circuitry combining an interval preceding the overdetection and an interval following the overdetection into a combined interval;

    the operational circuitry using the combined interval in estimating cardiac rate; and

    the operational circuitry using the estimated cardiac rate to make a therapy decision.

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