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Method for detecting TWA (T wave alternans) in electrocardiogram

A detection method and electrocardiogram technology, applied in the field of medical testing, can solve problems such as insufficient time resolution and line

Inactive Publication Date: 2014-09-03
GUANGDONG UNIV OF TECH
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Problems solved by technology

The TWA detection method based on the spectrum analysis method, first of all, it needs a continuous and stable 128 heart beats, and its time resolution is not good enough

Method used

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  • Method for detecting TWA (T wave alternans) in electrocardiogram
  • Method for detecting TWA (T wave alternans) in electrocardiogram
  • Method for detecting TWA (T wave alternans) in electrocardiogram

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[0036](1) Analyze the R, QRS, and T feature information of the ECG obtained from the ECG of the selected leads, and extract the QRS band and T wave matrix. Continuously select 120 cardiac beats from the place where the processing starts, and calculate the average of the T waves extracted from the first 60 beats as the template Tm. Then start to calculate the correlation coefficient c between the 60-beat T wave and the T wave template Tm i . will c i Compared with the correlation coefficient threshold th1=0.85, if c i If it is less than th1, add 1 to n, which represents the number of noises, and replace the original T wave with Tm. Then judge whether the value of n is greater than 15, if so, move forward 30 beats sequentially, and repeat the above steps until the value of n is less than 15.

[0037] (2) Fit the T wave in the T wave matrix of the data processed by (1) with the least square method y=a n x n +a n-1 x n-1 +Λ+ax+b. First set n=3, the fitting function y′=a c...

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Abstract

The invention discloses a method for detecting TWA (T wave alternans) in the electrocardiogram and belongs to the technical field of medical testing. The method comprises the following steps of: eliminating data sections with excessively high noise from selected electrocardiosignals by judging in the earlier stage so as to obtain relatively stable data suitable to analyze and carrying out analysis by taking M beats as an analysis window; firstly, extracting a T wave matrix for the M beats of electrocardiosignals and then carrying out data fitting on T waves in the T wave matrix to obtain a novel T wave matrix; respectively calculating alternans correlation indexes by a correlation analysis method to obtain an ACI (Allowable Concentration Index) of the integral analysis window); then judging whether the TWA exists in the integral analysis window by the correlation analysis method; if the TWA exists in the integral analysis window, respectively carrying out least square linear fitting on sectional odd and even beats of the existing TWA and calculating an actual TWA quantity; and if the TWA does not exist in the integral analysis window, intercepting a next analysis window to carry out analysis. According to the invention, the TWA signals can be effectively detected from the time domain angle and the TWA quantity is accurately quantized.

Description

technical field [0001] The invention relates to a detection method for T wave alternation in an electrocardiogram, which belongs to the technical field of medical testing. Background technique [0002] Malignant ventricular arrhythmia and sudden cardiac death are a major factor that kills lives in developed countries such as Europe and the United States, and pose a great threat to human life safety. Previous predictions of malignant ventricular arrhythmias and sudden cardiac death were mainly based on intracardiac electrophysiologic study (EPS), but in previous studies it was found that T wave alternans (TWA) is the key to the occurrence of malignant ventricular independent predictors of arrhythmia and sudden cardiac death (SCD). Ten large studies including 1300 patients from 1994 to 2000 confirmed that compared with intracardiac electrophysiological examination (EPS), the accuracy of TWA in predicting ventricular tachycardia / fibrillation and sudden cardiac death was at lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/0452
Inventor 万相奎严抗辉李明贵
Owner GUANGDONG UNIV OF TECH
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