Murayama M, Harumi K, Murao S
Jpn Heart J. 1976 Mar;17(2):139-49. doi: 10.1536/ihj.17.139.
Thirty-one patients with angina pectoris and 15 patients with myocardial infarction who performed exercise test by Master's double two-step test have been longitudinally followed up for 4-10 years. Exercise electrocardiogram was taken by Frank's lead and T loop was constructed in frontal and horizontal planes from 3 scalar tracings recorded at a paper speed of 100 mm/sec. ST vector was determined at 100 msec from the beginning of Q wave and the line connecting 2 ST vectors before exercise and at the point of the maximal ST change after exercise was determined as ST exercise vector. To indicate width of the T loop, the length to width ratio (L/W) was used and the change of width of the T loop induced by exercise was expressed by a ratio of L/W between before exercise and at the maximal change in frontal and horizontal planes. In cases having ST exercise vector of 0.1 mV or more the magnitude or the direction of the ST exercise vector alone has little prognostic value and widening of the T loop in addition to the ST exercise vector of 0.1 mV or more occurring after exercise was a predictive sign of poor prognosis and no widening of the T loop was a predictive sign of good prognosis.
对31例心绞痛患者和15例心肌梗死患者进行了Master二级梯运动试验，并对其进行了4至10年的纵向随访。采用Frank导联记录运动心电图，并以100mm/秒的纸速记录3个标量心电图，在额面和水平面构建T环。从Q波起始点100毫秒处测定ST向量，将运动前的2个ST向量连线与运动后ST最大变化点的连线确定为ST运动向量。为了表示T环的宽度，采用长宽比（L/W），运动引起的T环宽度变化用运动前与额面和水平面最大变化时的L/W比值表示。在ST运动向量≥0.1mV的病例中，仅ST运动向量的大小或方向预后价值不大，运动后除ST运动向量≥0.1mV外T环增宽是预后不良的预测指标，T环未增宽是预后良好的预测指标。
