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目的采用99Tcm-P53运动/静息门控心肌灌注显像计算左心腔短暂性缺血性扩张(TID)比值的正常值,并探讨对X综合征患者内膜下缺血的诊断价值。方法 X综合征组52例,冠状动脉造影或冠脉CT正常,而有典型的劳力性心绞痛症状;健康对照组由58例健康成年人组成,无糖尿病、高血压。均行核素99Tcm-P53运动/静息门控心肌灌注显像。采用西门子QGS软件对图像进行定量分析,计算TID比值。结果 X综合征组中TID比值为1.19±0.30,对照组中TID比值为0.79±0.19。以1.20为TID比值的正常上限值,X综合征患者内膜下缺血的检出率为61.2%。结论以TID比值1.20为正常截断值,是发现X综合征患者内膜下缺血的有效方法,补充并扩展了心肌灌注显像现有结果,是一种方便有效的指标。
Objective To evaluate the diagnostic value of 99 Tcm-P53 motor / resting gated myocardial perfusion imaging in the diagnosis of left ventricular transient ischemic dilatation (TID). Methods Fifty-two patients with syndrome X, with normal coronary angiography or coronary CT, had typical symptoms of exertional angina pectoris. The healthy control group consisted of 58 healthy adults without diabetes and hypertension. Nuclide 99Tcm-P53 exercise / resting gated myocardial perfusion imaging. Using Siemens QGS software for quantitative analysis of the image, calculate the TID ratio. Results The TID ratio was 1.19 ± 0.30 in group X and 0.79 ± 0.19 in control group. With a normal upper limit of 1.20 for the TID ratio, the rate of subendocardial ischemia in Syndrome X was 61.2%. Conclusion The TID ratio of 1.20 is a normal cut-off value. It is an effective method to find out subendocardial ischemia in patients with syndrome X. It is a convenient and effective method to supplement and extend the existing results of myocardial perfusion imaging.