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本文旨在探讨99mTc－MIBI肺心摄取比值在评价左心室收缩功能中的临床价值。材料和方法：对145例（34例正常人，70例心绞痛，41例心肌梗塞）受检者，行99mTc－MIBI心肌灌注断层显像的同时测定肺、心区放射性计数比值（LHR），并与核素心室显像方法测得的左室射血分数（LVEF）进行相关分析。结果：正常对照组、冠心病组的LHR和LVEF分别为0．41±0，07、58．7％±9．4％和0．49±0．08、41．2％±7．4％。15例接受PTCA治疗者术后与术前的LHR和LVEF差值分别为△LHR＝－0．03±0．07、△LVEF＝5．6％±8．7％。LHR与LVEF的相关分析结果为：LVEF≥50％者，相关系数r＝－0．694（p＜0．05），LVEF＜50％、≥35％者，r＝－0．644（P＜0．05）；LVEF＜35％者，r＝－0．716（p＜0．01）；上述三级的LHR敏感性分别为74．5％、78．1％、94．7％。结论：LHR简便、易行．在评价心肌血流变化的同时，可对心肌收缩功能及其变化做出评估，为临床提供有意义的参考信息。
This article aims to investigate the 99mTc-MIBI pulmonary heart rate in the evaluation of clinical value of left ventricular systolic function. MATERIALS AND METHODS: Radioimmunoassay (LHR) was performed simultaneously on 99mTc-MIBI myocardial perfusion imaging in 145 subjects (34 normal subjects, 70 patients with angina and 41 patients with myocardial infarction) And radionuclide ventricular imaging method measured ventricular ejection fraction (LVEF) were analyzed. Results: The LHR and LVEF of the normal control group and the coronary heart disease group were 0.41 ± 0,07, 58.7% ± 9.4% and 0.49 ± 0.08, 41.2% ± 7.4% . The difference of LHR and LVEF between the 15 patients undergoing PTCA and before operation were △ LHR = -0.03 ± 0.07 and △ LVEF = 5.6% ± 8.7% respectively. The correlation analysis between LHR and LVEF showed that LVEF≥50%, correlation coefficient r = -0.694 (p <0.05), LVEF <50%, ≥35%, r = -0.644 (P < 0.05), LVEF <35%, r = -0.716 (p <0.01). The LHR sensitivities of the three grades were 74.5%, 78.1% and 94.7% respectively. Conclusion: LHR is simple and easy to operate. In the evaluation of myocardial blood flow changes at the same time, myocardial systolic function and its changes can be assessed to provide meaningful clinical reference information.