Objective:Compare twelve lead AECG to three lead AECG for ascertaining the superiority of twelve lead AECG which myocardial Ischemia and arrhythmia were detected.Methods:Base on random control and parallelism control method

our hospital patients who were requested to examine by AECG were divided into twelve lead group and three lead group.Results:①The general state of health of the twelve lead group and the three lead group is similar.②The group which Ischemia ST-T decreasing was detected by the twelve lead AECG is higer than the three lead group.The differentence is statistical significant(P<0.01).③Premature ventricular contraction(PVC)

ventricular tachycardia(VT)and junctional zone escape beat in twelve lead are lower than in three lead.Premature atrial contraction(PAC)

Atrial Flutter(AF)

Atrial fibrillation(A)fand Atrial Escape Beat are higer than in three lead. However

the differentence is not statistical significant(P>0.05)④PVC can be made orientation by the twelve lead.Conclusion:Twelve lead AECG can detect ischemia ST-T changing and localize regions.Because of P wave clearing

supraventricular arrhythmia

ventricular arrhythmia and the VT source determining can be judged accurately by it.These conclusions offer accurately ECG diagnosis.