Three dimensional vector cardiograph and method for detecting and monitoring ischemic events

a three-dimensional vector and cardiac muscle technology, applied in the field of three-dimensional vector cardiograph and method for detecting and monitoring ischemic events, can solve the problems of high system redundancy, difficult to determine the net vector effect of this 3-d wave and its relationship to the overall movement of the cardiac muscle, and other techniques such as two-dimensional (2-d) vector cardiograms have proved in the past to be quite expensive and cumbersome, so as to enhance diagnostic analysis, enhance analysis and heart monitoring techniques, and enhance recognition
USRE43569E1Inactive Publication Date: 2012-08-07ECG TECH CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
ECG TECH CORP
Publication Date
2012-08-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method of determining an ischemic event includes the steps of: monitoring and storing an initial electrocardiogram vector signal (x, y, z) of a known non-ischemic condition over the QRS, ST and T wave intervals; calculating and storing a J-point of the vector signal and a maximum magnitude of a signal level over the T wave interval; monitoring a subsequent electrocardiogram vector signal over the QRS, ST and T wave intervals; measuring and storing the magnitude (Mag.) of the vector difference between a subsequent vector signal and the initial vector signal; measuring and storing the angle (Ang.) difference between a subsequent vector and the initial vector at points; regressing a line from points about 25 milliseconds prior to the J point and about 60 milliseconds after the J-point and determining the slope of the regression line and the deviation of the angle difference of the regression line; regressing a line from points about 100 milliseconds prior to the maximum magnitude of the signal level over the T wave interval and determining the slope of the regressing line and the deviation of the angle difference of the regression line; and comparing the slope and deviation of the lines from the J point and the T wave interval to a set of known values to determine the presence of an ischemic event.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] The present application claims the benefits of and priority to U.S. Provisional Patent Application Ser. No. 60 / 431,862 filed on Dec. 9, 2002, the entire contents of which are incorporated herein by reference.BACKGROUND

[0002] The present disclosure relates to a method for detecting and monitoring electrical signals from the heart for analysis of heart malfunctions. More particularly, the presently disclosed method relates to a technique for distinguishing between ischemic electrocardiograph (ECG) events and patient positional changes during patient monitoring.

[0003] Multi-lead ECGs for diagnosing various heart maladies have been used for many years. The most prevalent technique for analyzing and diagnosing heart conditions involves a 12-lead system. The 12-Lead system provides much redundant information in the frontal plane (X, Y) and transverse plane (X, Z) of the ECG vector signal. It permits only a rough visual estimate of the vector direc...

Claims

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