Method and system for the fast determination of EKG waveform morphology

• US 5,794,624 A
• Filed: 01/31/1997
• Issued: 08/18/1998
• Est. Priority Date: 01/31/1997
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Kwong, Manlik
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): SCHAETZLE, KENNEDY
• Application Number:
  US08/792,604
• Time in Patent Office: 564 Days
• Field of Search: 128/702, 128/696, 128/703, 128/704, 128/920, 128/923
• US Class Current: 600/515
• CPC Class Codes: A61B 5/35 by template matching
• CPC Class Codes: A61B 5/7232 involving compression of the physiological signal, e.g. to extend the signal recording period

Abstract

A method and system for providing the improved automated diagnosis of heart function on the basis of electrocardiographic data in a much less computationally intensive manner than has been done previously. The objectives of the method and system are accomplished by the following steps. First, waveform templates known to be indicative of heart conditions of interest are collected. Second, a data compression algorithm is used to extract from the collected waveforms only that data essential to making an accurate diagnosis of the conditions with which the templates are associated; the resulting data is used to construct waveforms referred to as reduced-data electrocardiographic waveform templates. Third, the reduced-data electrocardiographic waveform templates are then correlated with the patient'"'"'s electrocardiographic waveforms and on the basis of the results of the correlation a diagnosis is rendered.

Claims

1. A method for providing improved automated diagnosis of heart function on the basis of electrocardiographic data, said method comprising the steps of:

collecting one or more electrocardiographic waveform templates known to be indicative of heart conditions of interest;

selecting portions of said collected one or more electrocardiographic waveform templates with said selected portions being especially identified with said heart conditions of interest;

creating one or more reduced-data electrocardiographic waveform templates from said selected portions of said collected one or more electrocardiographic waveform templates by extracting from said selected portions of said collected one or more electrocardiographic waveform templates only predetermined points; and

diagnosing a patient'"'"'s heart function by correlating said created one or more reduced-data electrocardiographic waveform templates with said patient'"'"'s electrocardiographic waveform data.

2. The method of claim 1 wherein said step of collecting one or more electrocardiographic waveform templates known to be indicative of heart conditions of interest further comprises the steps of:

obtaining electrocardiographic waveform data from a plurality of patients;

determining which specific waveforms within said obtained electrocardiographic waveform data from a plurality of patients are indicative of said heart conditions of interest; and

collecting as said one or more electrocardiographic waveform templates known to be indicative of heart conditions of interest those specific waveforms within said electrocardiographic waveform data from a plurality of patients which are determined to be indicative of said heart conditions of interest.

3. The method of claim 1 wherein said step of selecting portions of said collected one or more electrocardiographic waveform templates further comprises the steps of:

identifying one or more critical data points within said collected one or more electrocardiographic waveform templates such that said identified one or more critical data points have high discriminating power with respect to the existence of said heart conditions of interest with which said collected one or more electrocardiographic waveform templates are associated; and

in response to said identifying step, selecting those portions of said collected one or more electrocardiographic waveform templates containing said identified one or more critical data points.

4. The method of claim 1 wherein said step of creating one or more reduced-data electrocardiographic waveform templates from said selected portions of said collected one or more electrocardiographic waveform templates by extracting from said selected portions of said collected one or more electrocardiographic waveform templates only predetermined points further comprises the steps of:

extracting one or more points within said selected portions of said collected one or more electrocardiographic waveform templates such that said extracted one or more points allow accurate diagnosis of said heart conditions of interest with which said selected portions of said collected one or more electrocardiographic waveform templates are identified; and

creating said one or more reduced-data electrocardiographic waveform templates from said extracted one or more points.

5. The method of claim 1 wherein said step of diagnosing a patient'"'"'s heart function by correlating said created at least one reduced-data electrocardiographic waveform templates with said patient'"'"'s electrocardiographic waveform data further comprises the steps of:

obtaining a representation of at least one waveform from said patient'"'"'s electrocardiographic waveform data;

correlating said one or more reduced-data electrocardiographic waveform templates with said obtained representation of said at least one waveform from said patient'"'"'s electrocardiographic waveform data; and

in response to the results of said correlating step, diagnosing said patient'"'"'s heart function.

6. A system for providing improved automated diagnosis of heart function on the basis of electrocardiographic data, said system comprising:

means for collecting one or more electrocardiographic waveform templates known to be indicative of heart conditions of interest;

means for selecting portions of said collected one or more electrocardiographic waveform templates with said selected portions being especially identified with said heart conditions of interest;

means for creating one or more reduced-data electrocardiographic waveform templates from said collected one or more electrocardiographic waveform templates by extracting from said selected portions of said collected one or more electrocardiographic waveform templates only predetermined points; and

means for diagnosing a patient'"'"'s heart function by correlating said created one or more reduced-data electrocardiographic waveform templates with said patient'"'"'s electrocardiographic waveform data.

7. The system of claim 6 wherein said means for collecting one or more electrocardiographic waveform templates known to be indicative of heart conditions of interest further comprises:

means for obtaining electrocardiographic waveform data from a plurality of patients;

means for determining which specific waveforms within said obtained electrocardiographic waveform data from a plurality of patients are indicative of said heart conditions of interest; and

means for collecting as said one or more electrocardiographic waveform templates known to be indicative of heart conditions of interest those specific waveforms within said electrocardiographic waveform data from a plurality of patients which are determined to be indicative of said heart conditions of interest.

8. The system of claim 6 wherein said means for selecting portions of said collected one or more electrocardiographic waveform templates further comprises:

means for identifying one or more critical data points within said collected one or more electrocardiographic waveform templates such that said identified one or more critical data points have high discriminating power with respect to the existence of said heart conditions of interest with which said collected one or more electrocardiographic waveform templates are associated; and

means, responsive to said means for identifying, for selecting those portions of said collected one or more electrocardiographic waveform templates containing said identified one or more critical data points.

9. The system of claim 6 wherein said means for creating one or more reduced-data electrocardiographic waveform templates from said selected portions of said collected one or more electrocardiographic waveform templates by extracting from said selected portions of said collected one or more electrocardiographic waveform templates only predetermined points further comprises:

means for extracting one or more points within said selected portions of said collected one or more electrocardiographic waveform templates such that said extracted one or more points allow accurate diagnosis of said heart conditions of interest with which said selected portions of said collected one or more electrocardiographic waveform templates are identified; and

means for creating said one or more reduced-data electrocardiographic waveform templates from said extracted one or more points.

10. The system of claim 6 wherein said means for diagnosing a patient'"'"'s heart function by correlating said created at least one reduced-data electrocardiographic waveform templates with said patient'"'"'s electrocardiographic waveform data further comprises:

means for obtaining a representation of at least one waveform from said patient'"'"'s electrocardiographic waveform data;

means for correlating said one or more reduced-data electrocardiographic waveform templates with said obtained representation of said at least one waveform from said patient'"'"'s electrocardiographic waveform data; and

means, responsive to said means for correlating, for diagnosing said patient'"'"'s heart function.