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Cardiac rhythm management systems and methods using multiple morphology templates for discriminating between rhythms

  • US 20040093035A1
  • Filed: 11/08/2002
  • Published: 05/13/2004
  • Est. Priority Date: 11/08/2002
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an electrogram sensing circuit, configured to be coupled to at least one electrode for receiving an intrinsic cardiac signal, the electrogram sensing circuit configured to provide cardiac complexes and an indication of heart rate obtained from a subject'"'"'s heart;

    a shock circuit, configured to be coupled to at least one electrode to deliver a shock to the heart;

    a stored first morphological template, coupled to the electrogram sensing circuit, the stored first morphological template obtained from the heart, in the absence of an arrhythmia, while the subject is resting or inactive;

    a stored second morphological template, coupled to the electrogram sensing circuit, the stored second morphological template obtained from the heart under a condition different from that of the first morphological template;

    a correlation module, coupled to the first and second morphological templates and the electrogram sensing circuit, the correlation module configured to declare an indication of a first rhythm state if the indication of heart rate exceeds a first predetermined threshold value and a morphology of at least one cardiac complex of the intrinsic cardiac signal correlates to either of the first and second morphological templates, and configured to declare an indication of a second rhythm state if the indication of heart rate exceeds the first predetermined threshold value and a morphology of the at least one cardiac complex of the intrinsic cardiac signal is uncorrelated to both the first and second morphological templates; and

    a shock control module, coupled to the correlation module and the shock circuit, the shock control module configured to trigger a shock if the correlation module declares the indication of the second rhythm state, and the shock control module configured to inhibit a shock if the correlation module declares the indication of the first rhythm state.

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