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QT离散度（QTD）反映各部位心室肌复极的离散程度。在心肌局部缺血或室壁运动异常、急性心肌梗塞、心肌肥厚及心功能不全时，均可导致QTD变化[1]。本文对18例冠脉造影或99mTc－MIBI核素心肌显像存在冠脉狭窄或存在心肌灌注缺损的冠心病患者，与对照组比较，观察心电图运动试验
QT dispersion (QTD) reflects the degree of ventricular repolarization in various parts of the dispersion. In myocardial ischemia or wall abnormalities, acute myocardial infarction, cardiac hypertrophy and cardiac insufficiency, can lead to QTD changes [1]. 18 cases of coronary angiography or 99mTc-MIBI radionuclide myocardial imaging in patients with coronary artery stenosis or myocardial perfusion defects, compared with the control group, ECG exercise test