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Detection of cardiac arrhythmias using template matching by signature analysis

  • US 5,273,049 A
  • Filed: 04/09/1992
  • Issued: 12/28/1993
  • Est. Priority Date: 04/09/1992
  • Status: Expired due to Fees
First Claim
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1. A method of detecting cardiac arrhythmias in a patient'"'"'s heart, comprising the steps of:

  • sampling a cardiac electrical signal when the heart is functioning in a known cardiac state;

    defining, for each sample of the known state cardiac electrical signal occurring within a predetermined time of interest, an amplitude window of signal amplitudes bracketing the amplitude of the known state cardiac electrical signal sample;

    storing a template sequence of amplitude window samples encompassing the predetermined time of interest;

    monitoring a time sequence of cardiac electrical signal samples when the heart is functioning in an unknown cardiac state;

    time aligning samples of the unknown cardiac state sequence with respect to samples of the template sequence of amplitude window samples;

    comparing, sample by sample, the samples of the unknown cardiac state sequence to the template sequence of amplitude window samples to determine the relative proportion of unknown cardiac state samples with amplitudes falling outside the amplitude window in comparison to unknown cardiac state samples with amplitudes falling inside the amplitude window; and

    classifying the functioning of the patient'"'"'s heart as other than the known cardiac state when the determined relative proportion meets a predetermined criteria and, otherwise, classifying the functioning of the patient'"'"'s heart as the known cardiac state.

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