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Detection of cardiac arrhythmias using correlation of a cardiac electrical signals and temporal data compression

  • US 5,217,021 A
  • Filed: 07/30/1991
  • Issued: 06/08/1993
  • Est. Priority Date: 07/30/1991
  • Status: Expired due to Term
First Claim
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1. A method of detecting cardiac arrhythmias in a patient'"'"'s heart, comprising the steps of:

  • sensing cardiac electrical signals when the heart is functioning in a known cardiac state;

    characterizing said known cardiac state in a time sequence of template samples;

    temporally compressing said time sequence of template samples;

    storing said temporally compressed template samples;

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

    temporally compressing said unknown cardiac state samples monitored during said time sequence;

    scan correlating said compressed unknown cardiac state samples with said stored compressed template samples to derive a correlation coefficient;

    comparing said correlation coefficient with a threshold value;

    classifying said unknown cardiac state within said known cardiac state when the correlation coefficient is greater than said threshold value, and classifying said unknown cardiac state outside said known cardiac state when the correlation coefficient is not greater than said threshold value, andhighpass filtering said sensed cardiac electrical signals when the heart is operating in each of said known cardiac state and said unknown cardiac state to substantially eliminate the mean amplitude of each of said temporally compressed template samples and said temporally compressed unknown cardiac state samples.

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