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目的 :探讨背向散射积分检测技术定量评价梗塞心肌组织特征的临床价值。方法 :检测 77例急性期、陈旧期心肌梗塞患者的梗塞心肌及 2 0例对照者的正常心肌背向散射积分标化值 (IBS% ) ,背向散射积分周期变异幅度 (CVIB)及其标化值 (CVIB% ) ,标化背向散射积分周期延迟时间 (DTCV% )以及收缩期室壁增厚率 (Δ T% ) ,并比较不同梗塞时间 IBS参数的变化。结果 :梗塞心肌的 CVIB及 CVIB%明显低于正常心肌 ,IBS%及 DTCV%则明显增高。梗塞时间延长 ,IBS%亦随之增高 (陈旧期组 73.87± 13.46 ,急性期组 5 9.5 0± 9.35 )。CVIB及 CVIB%均与Δ T%呈高度相关 (r =0 .746 ,0 .75 6 ,P <0 .0 1) ,IBS%及 DTCV%与 ΔT%亦具有一定的相关性 (r =0 .746 ,0 .75 6 ,P <0 .0 1)。结论 :背向散射积分检测技术能够定量检测梗塞心肌的组织特征 ,有助于评价心肌的收缩能力及心肌纤维化程度。
Objective: To explore the clinical value of backscatter integral detection in quantitative evaluation of myocardial infarction characteristics. Methods: Normal myocardial backscatter integral (IBS%), backscatter integral cyclic variation (CVIB) and its index of 77 acute myocardial infarction patients and 20 normal controls were detected. (CVIB%), normalized backscatter integration period delay time (DTCV%) and systolic wall thickening rate (ΔT%), and compared the change of IBS parameters at different infarct time. Results: CVIB and CVIB% in infarcted myocardium were significantly lower than those in normal myocardium, while IBS% and DTCV% were significantly higher. IBS% also increased with prolongation of infarction (73.87 ± 13.46 in obsolete and 5.90 ± 9.35 in acute). CVIB and CVIB% were highly correlated with ΔT% (r = 0.746, 0.756, P <0.01). IBS% and DTCV% also had some correlation with ΔT% (r = 0 .746, 0.7575, P <0.01). Conclusion: Backscatter integral detection technique can quantitatively detect the myocardial infarction characteristics and help to evaluate myocardial contractility and myocardial fibrosis.