超声背向散射技术定量评价心肌存活性的临床研究

目的　探讨心肌背向散射积分参数定量评价心肌梗死后存活心肌的可行性。方法　于乳头肌水平左室短轴观记录 2 5例心肌梗死患者的超声背向散射图像 ,比较经皮冠状动脉球囊成形术治疗前后心肌背向散射积分周期变异 (CVIB)和标化CVIB(CVIB % )的变化。结果　按不同节段分组比较 ,治疗前后存活心肌的CVIB及CVIB %改变具有显著性。若以CVIB %增加 (ΔCVIB % ) >10为判断存活心肌的标准 ,则敏感性、特异性和准确性分别为 81.3 %、87.5 %和 83 .3 %。结论　对于心肌梗死患者 ,CVIB和CVIB %可作为评价心肌存活性的定量、客观的指标运用于临床。

A clinic study of viable myocardium with ultrasonic integrated backscatter

Objective To evaluate cyclic variation of integrated backscatter (CVIB) and calibrated CVIB (CVIB%) in diagnosing viable myocardium after myocardial infarction (MI). Methods Twenty five patients with MI were studied by ultrasonic integrated backscatter before and 4 weeks after percutaneous transluminal coronary angioplasty (PTCA). CVIB and CVIB% of 4 segments in parasternal papillary short axis view were analyzed.Results CVIB and CVIB% increased significantly 4 weeks after PTCA. With CVIB% increasing more than 10 for diagnosing viable myocardium, the sensitivity, specificity and accuracy were 81.3 %, 87.5 % and 83.3 % respectively.Conclusions CVIB and CVIB% were valuable for diagnosing viable myocardium quantitatively and objectively.