静息心肌显像左心腔与心肌计数比值和肺摄取作为心肌梗塞患者左心功能参数的研究

目的探讨＾９９ｍＴｃ－ＭＩＢＩ静息心肌断导工室腔与心肌计数（Ｃ／Ｍ）比值和肺摄取（ＬＨＲ）判断心肌梗塞（ＭＩ）患者左心功能状况的临床价值。方法；７１例ＭＩ患者１周内完成静息心肌显像和平衡法核素心室造影（ＥＲＮＡ），自心肌采集图像的第９顿（前位）原始图像计算出ＬＨ挫心肌断层的短轴图像计算出Ｃ／Ｍ值，并与ＥＲＮＡ的左室射血分数（ＬＶＥＦ）行相关分析。结果：Ｃ／Ｍ比值与ＬＶＥＦ显著正相关，ｒ值为０．０７

STUDY OF LDFT VENTRICULAR CAVITY-TO-MYOCARDIAL COUNT RATIO AND LUNG UPTAKE DUING REST 99mTc-MIBI MYOCARDIAL SPECT IMAGING:THE NEW PARAMETERS FOR LEFTVENTRICULAR FUNCTION WITH MYOCARDIAL INFARCTION

Objective: To assess the clinical value of cavity-to-myocardial count ratio (C/M ratio) and lung uptake (LHR) duing rest 99mTc-MIBI myocardial SPECT imaging in the evaluation of left ventricular function with myocardial infarction (MI). Methods: 71 patients with MI were investigated with rest 99mTc-MIBI myocardial SPECT imaging and radionuclide ventriculography (RNV) within 1 week. LHR were calculated from the anterior projection of the SPECT sets. C/M ratio was determined on short-axis tomograms and LVEF were calculated from RNV. The correlatin among LVEF and C/M ratio, LHR were analyzed. Results: A positive correlation was observed between C/M ratio and LVEF (r=0.701, p<0.001). There was a negative correlation between LVEF and LHR (r=-0.576, p<0.001). The sensitivity of C/M ratio and LHR for detecting left ventricular dysfunction with MI was 81.1%, 51.4%; the specificity was 79.4%, 91.2%; the accuracy was 80.3%, 70.4% respectively. The sensitivity of C/M ratio was superier to LHR, there was significant difference (p<0.01). The specificity of LHR was superier to C/M ratio, but there was no significant differene (p>0.05). Conclusions: Both C/M ratio and LHR duing rest 99mTc-MIBI myocardial SPECT imaging is useful in the evaluation of left ventricular function with MI. They have their own advantages and limitations and they are complementary.