Because the multitudinous inward and outward ion current participate 4 periods depolarization and with other factors such as different race of animals 、specimen gathering 、the way of separate cell、 the component of the fluid which was used to perfuse and the experiment equipments and so on,it leads to many divergence on the research result.

The effect of Losartan on early afterdepolarization (EAD) and arrhythmias during reperfusion was observed.

Method Combined unipolar and bipolar mapping technique for recording epicardial electrical activity was applied to detect the propagation of depolarization wave over the epicardium.

In the paper, it is analyzed briefly that remarkable problems existed in electric power design such as distributing line protection, protective selectivity, 4-pole switch application, EPS application and soft starter through selective examination on design quality and common correct settlement method is put forward.