The sensitivity ,specificity and negative predictive value of ST depression in leads V-l or V-2 for identifying the LCX as the IRA were 83% ,56% and 93% , respectirely.

• 根据V_1或V_2导联ST段压低判断LCX为IRA的敏感性、特异性和阴性预测值分别为83%25、56%25和93%25.