In order to improve the diagnostic precision of cardiac disease and understand the effect on the body surface ecg of myocardial cell and ionic activity , the experimental method can be used , but it needs long time , high cost and big fatalness , so ca n ' t make people content 為了提高心電圖診斷水平,深入了解心肌細胞及其離子活動對體表心電的影響,可以采用人體或動物實驗的方法,但是,這些方法存在周期長、代價高、危險性大等問題,很難令人滿意。