冠心病患者运动试验中QRS波时间变化

Exercise-induced changes of QRS duration in patients with coronary heart diseas

观察了42例踏车试验阳性的冠心病人及20例踏车试验阴性的正常人踏车运动试验前后QRS波时间的变化，结果显示，正常人踏车即刻2、4、分钟QRS波时间较踏车前明显缩短（P均＜0．05）。冠心病组踏车后即刻、2、4、6分钟较踏车前显著延长（P均＜0．05），ST段明显压低者，QRS波时间延长更显著，提示冠心病患者运动致QRS时间延长是心肌缺血的一个标志。

Changes of QRS duration induced by exercise were observed in 42 patients with coronary heart disease (CHD) with positive exercise test (ET) and 20 normal sub jects with negative ET. The results showed that QRS duration was markedly longer right and 2.4.6 minutes after exercise than those before exercise in CHD patients(P<0.05), and that the opposite response occured in normal subjects.There was some correlation between the depression of ST segment and the prolongation of QRS duration. The results indicate that exerceise - induced QRS prolongation in CHD patients may be a marker of exercise - induced myocardial ischemia.Kdywords: coronary heart disease ,treadrnill exercise test, QRS duration