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Method and apparatus for analyzing and interpreting electrocardiograms using spectro-temporal mapping

  • US 5,046,504 A
  • Filed: 04/06/1990
  • Issued: 09/10/1991
  • Est. Priority Date: 02/01/1989
  • Status: Expired due to Term
First Claim
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1. The method of evaluating electrocardiogram (ECG) signals of a patient which comprises:

  • digitizing a large number of successive, repetitive ECG waveforms, each waveform representing an amplitude with respect to time from the patient, at sampling points equal to a sampling rate greater than about 500 per second;

    averaging the digital sample values at corresponding sample points on the successive ECG waveforms to produce a single digitized signal averaged, high resolution ECG (HRECG) waveform having significantly enhanced signal-to-noise ratio;

    producing a set of digital spectrum values representative of an approximate power density spectrum at each of a large number of generally equally spaced sampling time intervals over the HRECG waveform, each spectrum value being a function of the power of the HRECG waveform in a finite time/amplitude window having a time deviation substantially less than the time period of the HRECG waveform which is of interest; and

    determining the presence of late potentials from the set of power density spectrums.

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