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ST段改变一、ST段压低: 多数作者认为缺血型ST段压低的阳性标准是:Master二级梯运动试验以水平型ST段压低>0.5mm;多级运动试验以水平型或下斜型ST段压低≥1mm,且持续时间≥0.08秒为阳性。有人提出,F斜型ST段压低伴T波直立或J点压低伴QX/QT≥50％亦属阳性。Master运动试验时,若Ⅱ、Ⅴ_(4～6)联ST段压低>2mm,则不论其形态如何均属阳性,而上斜型ST段压低应视为可疑。一般说来,缺血型ST段压低越深,持续时间越长,病变程度愈重、病死率愈高。Goldman指出,当ST段压低≥3mm时,左冠状动脉主干或三支病变发生率高达69～74％,其中92％有左前降支近端病变。若在低运动负荷状态下,运动试验早期即
ST segment changes a ST-segment depression: Most authors believe that ischemic ST-segment depression in the positive standard is: Master two ladder exercise test to horizontal ST-segment depression> 0.5mm; multi-level exercise test to horizontal or down-inclined ST segment depression ≥ 1mm, and the duration ≥ 0.08 seconds is positive. It was suggested that F oblique ST segment depression with T wave upright or J point depression with QX / QT ≥ 50% is also positive. In the case of Master exercise test, ST segment depression of type Ⅱ and Ⅳ (4-6) should be considered suspicious irrespective of its shape if the depression of ST segment is> 2mm. In general, the deeper ischemic ST segment depression, the longer the duration of the lesion severity, the higher mortality. Goldman pointed out that when the ST segment depression ≥ 3mm, the incidence of left main coronary artery or three lesions as high as 69 to 74%, of which 92% have proximal left anterior descending artery disease. If the state of low exercise load, early exercise test that is