目的：探讨心肌背向散射积分(IBS)参数评估心肌梗死患者心肌病变的价值及其与局部心肌收缩功能的关系。方法：用背向散射联机分析技术，观测31例前间壁心肌梗死患者及27例正常人前间隔标化平均背向散射积分(AII%)，背向散射积分周期变异幅度(CVIB)；通过二维超声测算室壁增厚率(WT%)。结果：与正常人相比，心肌梗死患者的AII%明显增加(2.2±0.3 vs 1.6±0.2,P＜0.01),CVIB明显减低(3.3±1.7 vs 7.9±1.3,P＜0.01)。CVIB与反映局部心肌收缩功能的指标(WT%)呈高度相关(r为0.78，P＜0.01)，AII%和WT%呈一定程度相关(r为－0.56，P＜0.01)。结论：IBS两个参数，即AII%和CVIB，可以区分正常心肌和梗死区心肌，并能反映局部心肌收缩功能，具有评估心肌存活性的潜力。%Objective:To discuss the clinical application of myocardial integrated backscatter(IBS)parameters to the assessment of the lesions of myocardium and observe the relations between IBS parameters and the regional systolic function in patients with myocardial infarction.Methods：Two myocardial integrated backscatter parameters,the magnitude of cyclic variation in integrated backscatter(CVIB)and the calibrated average image intensity(AII %),were measured in 27 normal persons and 31 patients with anteroseptal myocardial infarction.Befor IBS studies,all subjects were examined with conventional two-dimensional echocardiography(2-DE)to calculate the percent of systolic wall thickening(WT %).Results:AII % was higher and CVIB was lower in the infarcted septum compared with those of normal subjects.CVIB correlated quite well with WT%(r＝0.78,P＜0.01),and there was a slightly weaker,although significant,correlation between AII % and WT%(r ＝－0.56，P＜0.01）.Conclusions:Both AII % and CVIB were considered to be useful to assess myocardial fibrosis and be valuable in the assessment of the regional systolic function.These two IBS parameters may be reflect the myocardial viability.
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