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Methods and devices for accurately classifying cardiac activity

  • US 8,600,489 B2
  • Filed: 03/30/2012
  • Issued: 12/03/2013
  • Est. Priority Date: 05/07/2008
  • Status: Active Grant
First Claim
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1. A method of operation in an implantable cardiac stimulus (ICS) system comprising a canister housing operational circuitry for the ICS system, the canister having a canister electrode disposed thereon, and a lead having at least a first lead electrode disposed thereon, the canister electrode and the first lead electrode electrically coupled to the operational circuitry;

  • the method comprising;

    detecting electrical events occurring within the patient, wherein the detected electrical events are separated by intervals;

    calculating a cardiac rate using a set of the detected electrical events;

    identifying one or more detected events as likely occurring due to overdetection;

    analyzing intervals around the events identified as likely occurring due to overdetection to determine whether the likely overdetection is likely a T-wave and;

    a) if the likely overdetection is likely a T-wave, correcting data relating to the overdetection to reduce calculated cardiac rate;

    orb) if the likely overdetection is unlikely to be a T-wave, disabling data correction methods in the ICS system for at least the likely overdetection;

    determining whether a likely cardiac arrhythmia is occurring and, if so, determining whether stimulus is needed; and

    if stimulus is needed, delivering electrical stimulus to the patient from the ICS system.

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