运动试验诱发老年人心肌缺血时的QT离散度

为探讨运动试验诱发老年人心肌缺血时ＱＴ离散度（ＱＴｄ）及ＱＴｃ离散度（ＱＴｃｄ）变化的机制及临床意义，观察４０例老年人运动前后ＱＴｄ及ＱＴｃｄ，结果显示：阳性组２２例，阴性组１８例。运动前两组间无显著性差异（Ｐ〉０．０５）。运动后与运动前比较，阴性组差异仍无显著性（Ｐ〉０．０５），而阳性组ＱＴｄ及ＱＴｃｄ增大，差异有显著性（Ｐ〈０．０１）。运行后两组间差异亦有显著性（Ｐ〈０．０１）。认为运动试验诱

Changes of QTd and QTcd in the Aged with Cardiac Ischemia Induced by the Treadmill Exercise Test

In order to investigate the mechanism and clinical significance of the changes of QTd and QTcd in the cardiac ischemia induced by the treadmill exercise test, 40 old people divided into two groups were observevd before and after the exercise. It was found that before the test was performed there was no significant difference between the two groups in terms of QTd and QTcd (P>0 05) After the exercise, however, QTd and QTcd in the positive group increased significantly(P<0 01) compared with those in the same group before the test, whereas no significant changes were shown in the negative group (P>0 05). Significant changes also occurred between the two groups after the exercise. The results suggest that in the aged people with cardiac ischemia evoked by the treadmill exercise QTd and QTcd increased significantly and that these could be used as an index in judging whether the exercise test is positive.