Ghaffari Ali, Atarod Mohammad, Ghasemi Masood
Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran.
Cardiovasc Eng. 2009 Mar;9(1):6-10. doi: 10.1007/s10558-009-9065-4.
An innovative method was proposed on the basis of vectorcardiography to characterize the location and extent of moderate to large, relatively compact infarcts using ECG evidence. It is assumed that heart vector is proportional to relevant active depolarization area(s). The normal VCG was then used to examine our ideas based on the information of location, amplitude, and direction of heart vector at any instant that is included in it. The model-based comparison of cases under study and relevant normal VCGs gives region and extent of myocardial infarction. Three criteria were finally defined to evaluate the presented method based on Physionet database. EPD, which is the percentage discrepancy between the extent of the infarct as estimated from our proposed method and as determined from the gold standard. SO, which was defined as the overlap between the sets of infarct segments as estimated and as determined from the gold standard. And CED, which is the distance between the centroid (geometrical center) of the infarct as estimated from our method and as determined from the gold standard. Finally, we gained the values of EPD equal to 32, SO equal to 0.933 and CED equal to 1. The presented method is not applicable in cases of hypertrophy, Bundle Branch Block (BBB) and arrhythmia which can be a plan for future work.
在心电图向量图的基础上提出了一种创新方法，利用心电图证据来描述中度至大面积、相对致密梗死灶的位置和范围。假定心脏向量与相关的有效去极化区域成正比。然后，基于正常心电图向量图中包含的任一时刻心脏向量的位置、幅度和方向信息来检验我们的想法。通过对研究病例与相关正常心电图向量图进行基于模型的比较，得出心肌梗死的区域和范围。最后根据Physionet数据库定义了三个标准来评估所提出的方法。EPD，即根据我们提出的方法估计的梗死范围与根据金标准确定的梗死范围之间的差异百分比。SO，定义为根据估计和根据金标准确定的梗死节段集合之间的重叠。以及CED，即根据我们的方法估计的梗死质心（几何中心）与根据金标准确定的梗死质心之间的距离。最后，我们得到EPD值等于32，SO值等于0.933，CED值等于1。所提出的方法不适用于肥厚、束支传导阻滞（BBB）和心律失常的情况，这可以作为未来工作的一个计划。
