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EKG system and method using statistical analysis of heartbeats and topographic mapping of body surface potentials

  • US 4,974,598 A
  • Filed: 03/28/1989
  • Issued: 12/04/1990
  • Est. Priority Date: 04/22/1988
  • Status: Expired due to Term
First Claim
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1. An electrocardiographic system for the detection of heart disease in a patient including:

  • at least 20 electrodes to detect heart beat activity analog electrical signals, adapted to be removably connected to the skin of the patient in separated locations around the heart on the chest, sides and back of the patient (torso);

    amplification means to amplify the analog electrical signals detected at each electrode;

    digital conversion means to convert the said amplified electrical signals into EKG patient digital data;

    norm storage means to receive and store normative EKG digital data representing normal heart activity electrical signals and features extracted from such signals during the time of the cardiac cycle;

    digital computer statistical analysis means comprising space-time domain analysis means space-time domain and space-frequency domain analysis means to analyze the said patient digital data on a statistical basis compared to said stored normative data;

    said space-frequency domain analysis means including Fourier transform (FT) means for performing from 0 to 250 Hz a fourier transform of the patient digital data to form FT transformed data;

    subclass means to form homogenous subclasses of heart beats using the Fourier transform transformed data;

    transform means to statistically compare said subclasses with said normative data to produce transformed Fourier transform data;

    inverse Fourier transform means to inverse fourier transform said transformed Fourier transform data to produce inverse Fourier transform data;

    said space-time domain analysis including means to form homogenous subclasses of EKG waveshapes and transform means to statistically compare said patient digital data with said normative data in each subclass;

    topographic map display means to display the results of said statistical analysis of the signals from each electrode on a topographic map representing the chest, sides and back of the patient, each map location corresponding to the location of corresponding connected electrode; and

    means to classify the type of coronary artery disease by computing discriminant functions.

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