T波交替散点图法的指标检测评估

An index evaluation of Poincare scatter for T-wave alternans

目的研究心电信号散点图形态特征与T波交替(T-wave alternans,TWA)的相关程度,评估形态指标检测T波交替存在与否的可靠性,为T波交替的检测提供准确、有效、计算简单的检测方式。方法首先在散点图图形基础上提出向量长度指标(vector length index,VLI),然后用MATLAB7.0软件对美国MIT/BIH标准心律失常数据库和欧洲ST-T心电数据库进行仿真,并将仿真所得散点图法的VLI和谱分析法的Vtwa作阈值分析及相关性分析。结果仿真检测结果显示,在向量长度指数VLI≤10 ms时,心电图中含有TWA,否则不含TWA。根据Kappa一致性检验得出:K=0.6932,即VLI与Vtwa具有很强的相关性。结论 VLI能够用于检测心电信号中是否存在T波交替。

Objective We study on the correlation between the graphic mode of Poincare scatter and Twave alternans,and evaluate the reliability of morphological index for detecting T wave alternans presence in order to provide an accurate, effective and simple detection method of calculation for T wave alternans detection. Methods Firstly,the vector length index（ VLI） based on the graph of the scatter plot is presented.Then VLI proposed in the scatter plot graph simulates the American Standard MIT / BIH arrhythmia database and the European ST-T ECG database by MATLAB7. 0. Lastly,the results of VLI and Vtwaare compared to determine the threshold and make the correlation analysis. Results The simulation test results indicate that TWA is present in electrocardiogram（ ECG） as VLI is equal to or less than 10 ms. Otherwise,TWA is absent.The kappa consistency test is K = 0. 6932,namely VLI and Vtwahas a strong correlation. Conclusions VLI can be used for the detection of T-wave alternans.