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Dynamically filtered beat detection in an implantable cardiac device

  • US 8,548,573 B2
  • Filed: 01/18/2010
  • Issued: 10/01/2013
  • Est. Priority Date: 01/18/2010
  • Status: Expired due to Fees
First Claim
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1. A method of cardiac signal analysis in an implantable cardiac stimulus or monitoring device, the device comprising an implantable canister housing operational circuitry and having a plurality of electrodes coupled to the operational circuitry;

  • the method comprising;

    capturing a signal from a chosen set of the plurality of electrodes; and

    performing cardiac beat detection by comparing a detection threshold to an amplitude of the captured signal by;

    a) using a signal that undergoes post-beat filtering for a predefined period of time following the detected cardiac event; and

    b) using a signal that undergoes default filtering once the predefined period of time has expired;

    wherein the post-beat filtering is configured to attenuate frequencies correlated to T-waves more greatly than the default filtering;

    wherein the method is performed on a beat-by-beat basis, such that after detection of a cardiac beat, beat detection using the post-beat filtering is performed and, if no additional beat is detected during the predefined period of time following the detected cardiac event, beat detection using the default filtering is performed.

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