摘 要 目的：探讨声学密度定量(AD)技术在评价缺血、梗塞后心肌内在收缩性能方面的临床应用价值。方法：对70例冠心病患者(分为缺血组与梗塞组)及30例正常人相应部位心肌及左室腔血液的CVIB值进行测定。结果：与正常节段比较,缺血及梗塞节段的CVIB值明显减少, N-Delay明显延长;14例患者梗塞节段的CVIB曲线与正常节段呈镜向改变;三组左室腔血液及二尖瓣环(MVR)的CVIB值无显著差异;结论：AD技术能客观反映缺血、梗塞后心肌内在收缩性能的变化,具有较高的敏感性和特异性,对于临床鉴别心肌收缩异常具有一定的诊断意义。

A Study of MyocardialContractility in Ischemia or Infarction by Acoustic Densitometry

Xia Hongmei,Gao Yunhua,Yang Chengye

    (XinQiao Hospital,The Third Military Medical University,Chongqing 400037 China)

ABSTRACT Objective:To evaluate thediagnostic value of acoustic densitometry (AD)technique in detecting myocardialcontractility secondary to ischemia or infarction. Methods：Seventy patients withcoronary artery disease(CAD)and 30 normals were involved in this study.Measurements ofcyclic variation of integrated backscatter (CVIB)were obtained in corresponding regionalmyocardium and blood of the left ventricle.Results:In comparison with the normal regionalmyocardium,the values of Normalized-Delay increased but CVIB decreased significantly incorresponding ischemic or infarcted myocardium in CAD groups(P<0.005).There were nosignificant difference of the CVIB values in MVR or blood in the threegroups.Conclusion:Acoustic densitometry can detect the changes of myocardialcontractility.It is useful for identification of abnormal myocardial contractility.

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