基于运动心脏模型的心电仿真

ECG Simulation Based on Dynamic Heart Model.

目的心脏 -躯干是产生心电信号的激励源 -信号处理系统 ,心电正问题的核心内容是研究心脏电偶极子和躯干的形状与电学特性对体表电位的影响。活体心脏收缩 /舒张和扭转是心脏的一个基本性质。本文的目的是考查这种运动对体表电位的影响。方法根据超声心动图的实测数据 ,在传统的静态心室模型基础上 ,利用三维空间的尺度变换和旋转变换 ,分别表示心肌的收缩 /舒张运动和扭转运动 ,建立面向心电正问题的运动心脏模型。然后 ,实现心电传播仿真和心电场求解 ,计算体表心电图。结果仿真了 1 2导心电波形 ,发现相对于静态模型 ,运动模型对ST段形态影响较大。结论为了更有效地进行心电场求解 ,建立面向心电仿真的运动心脏模型是必要的。

Objective Heart torso is the stimulation signal processing system of ECG (Electrocardiogram). One of the key contents of ECG forward problem study is how the geometric and electrical characteristics of heart and torso effect the ECG. Motion is one basic nature of heart in vivo. The paper investigated the impact of heart motion on ECG. Method Firstly, according to the real measured data of ultrasound cardiogram, based on the traditional static ventricular model, we described the systole diastole motion and wringing motion by employing the scaling and rotational transformation in 3 D space respectively and constructed the dynamic heart model for ECG forward problem. Then, the excitation propagation was simulated, ECG governing equations was solved and the torso surface ECG was calculated. Result 12 lead ECG waves were simulated using this method. The results demonstrated that morph of ST segments were affected apparently based on dynamic heart model compared with that based on the static heart model. Conclusion It was necessary to consider the heart motion effects in the study of ECG forward problem.