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Accurate Cardiac Event Detection in an Implantable Cardiac Stimulus Device

  • US 20090228057A1
  • Filed: 03/06/2009
  • Published: 09/10/2009
  • Est. Priority Date: 03/07/2008
  • Status: Active Grant
First Claim
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1. An implantable cardiac stimulus device (ICSD) comprising:

  • a canister housing operational circuitry configured to perform cardiac signal analysis and configured to provide cardiac stimulus;

    a lead electrode assembly coupled to the canister and operatively coupled to the operational circuitry;

    wherein the operational circuitry is configured to perform a beat detection method comprising;

    capturing electrical signals from the electrodes when implanted in a patient;

    identifying events in the captured electrical signals using a detection profile, the detection profile providing a threshold having a threshold configuration for comparison to the captured signals such that, when the captured signals exceed the threshold, a detected event is declared;

    comparing a peak amplitude of a first detected event to a peak amplitude of a second detected event to determine whether the first and second events are similar or dissimilar; and

    if the first and second events are similar, using a first threshold configuration for detecting a subsequent event;

    orif the first and second events are dissimilar, using a second threshold configuration for detecting a subsequent event,wherein a sensitivity of the second threshold configuration is different than that of the first threshold configuration.

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