The Location And Extent Of Myocardial Ischemia Displayed By The Compasses Based On ST Injury Vectors

ST injury vector displayed in the compass was proposed to visualize the location and extent of myocardial ischemia. Portable ECG acquisition equipment was adopted to collect electrical signals from the body by standard12-lead electrodes. And after data transmission and integration by A/D conversion and programmable controller, the electrical signals were converted into the real effective digital ECG data. Analysis of ST deviations from the standard12-lead ECG allows for estimation a ST injury vector. The direction of this vector can be used to localize ischemia and the magnitude of the vector correlated with the extent of ischemia. The purple area in compass indicates the ischemic region, and the red area indicates normal.Thirty-two patients with myocardial ischemia were respectively detected by the ST injury vector method, electrocardiogram and coronary angiography. The diagnosis of ST injury vector method was compared with the other two methods, the results are as follows:compared with electrocardiogram test, Kappa value was0.9036, sensitivity96.2%, specificity100%and accuracy96.9%, positive rate of81.3%, P>0.1; And compared with the method of coronary angiography, Kappa value was0.7949, sensitivity96.2%, specificity83.3%and accuracy93.8%, positive rate of81.2%, P>0.1. It proved that there are high consistency and no significant difference between ST injury vector and electrocardiography and coronary angiography, and the accuracy is high. ST injury vector is valuable in the field of myocardial ischemia.The innovation of this paper is that only10electrodes are needed for this method, and using ST segment abnormal offset value form12-lead ECG synthesis a new ST injury vector. Then one dimensional ECG is converted to two-dimensional, and the myocardial ischemia information is visualized in the compass. In this way, it implements the12-lead implied in the explicit expression of myocardial blood distribution information to the ST compass. It avoids the heart ECG electric field method for solving the inverse problem of academic problems, namely the absence of inherent characteristics and a unique solution for solving the results of pathological features.