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Methods and devices for accurately classifying cardiac activity

  • US 8,265,749 B2
  • Filed: 12/14/2009
  • Issued: 09/11/2012
  • Est. Priority Date: 03/07/2008
  • Status: Active Grant
First Claim
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1. A method of cardiac signal analysis in an implantable medical device (IMD) the IMD including a number of implantable electrodes and operational circuitry coupled to the implantable electrodes for performing the method of cardiac signal analysis, the method comprising:

  • a) the operational circuitry detecting events in a signal captured using the implantable electrodes;

    b) the operational circuitry determining which detected events to certify for use in rhythm identification by;

    i) applying analysis of the morphology of a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified;

    ii) applying interval analysis on a set of detected events in order to identify overdetected events such that, if a likely overdetection is identified, the likely overdetection is not certified; and

    iii) certifying at least some detected events of the set of detected events;

    c) the operational circuitry determining whether a malignant cardiac rhythm is occurring using only certified detected events wherein each certified detected event has undergone analysis of at least b)i) and b)ii) before use to determine whether a malignant cardiac rhythm is occurring; and

    d) the IMD delivering therapy in response to the malignant rhythm.

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