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心电图中从QRS波群的终点(J点)到T波起始的一段为ST段,相当于动作电位的第二相。在此期间,心室处于除极状态,细胞表面无电位差,不产生电流,故正常的ST段在等电线上。实际上,正常人中ST段可有轻度向上或向下偏移,其偏移范围在各导联中为-0.5～+1mm,V_1～V_2导联中抬高可达2～3mm。ST段时间为0.05～0.15秒。异常ST段的变化包括超出正常范围的ST段抬高和压低,以及形态的改变。临床上诸多因素均可
Electrocardiogram from the end point of QRS complex (J point) to the T wave of the beginning of a ST segment, equivalent to the action potential of the second phase. During this period, the ventricular in the depolarization state, the cell surface without potential difference, does not produce current, so the normal ST segment in the electrical wire. In fact, the normal ST segment may be slightly upward or downward migration, the offset range of -0.5 ~ +1 mm in each lead, V_1 ~ V_2 leads up to 2 ~ 3mm. ST segment time is 0.05 ~ 0.15 seconds. Abnormal ST segment changes include ST-segment elevation and depression beyond the normal range, as well as morphological changes. Many clinical factors can be