64层螺旋CT对心肌桥与冠状动脉粥样硬化相关性的评价

目的：利用64层螺旋CT评价左冠状动脉前降支心肌桥（MB）与该支冠状动脉粥样硬化的相关关系。方法：连续收集300例因怀疑冠心病（CHD）而行64层螺旋CT冠状动脉血管成像（CTA）的病例的资料,由2名CT诊断医师独立判断并在结果一致时确定为前降支MB。将所有病例分为前降支MB组和非MB组,利用MPR、CPR、VR等后处理技术联合观察左冠状动脉前降支钙化及粥样硬化斑块的总体发生率,测量前降支由于斑块所致的狭窄率,比较MB组与非MB组的平均狭窄程度以及钙化、粥样硬化斑块的总体发生率。结果：在300例受检对象中冠状动脉CTA发现前降支MB74例（24.7%,74/300）。MB组与非MB组前降支钙化的发生率分别为36.5%与31.3%,粥样硬化斑块的发生率分别为54.1%与45.1%,MB组与非MB组的平均狭窄程度分别为48.4%与44.6%,两组之间钙化的发生率、粥样硬化斑块的发生率及平均狭窄程度差别均无明显统计学意义（P=0.40;P=0.18;P=0.97）。结论：左冠状动脉前降支MB对该支冠状动脉狭窄程度及粥样硬化斑块的总体发生率影响不明显。

The correlative investigation between the myocardial bridge and the coronary atherosclerotic plaque with 64-slice CT

Objective：To investigate the correlation between the myocardial bridge and the coronary atherosclerotic plaque of the left coronary anterior descending branches with 64-slice computed tomography.Methods：A total of 300 patients suspected as with coronary artery disease（CAD） underwent 64-slice computed tomography coronary angiography performed by 2 radiologists independently.When consistency was obtained among the independent results,the diagnosis of MB-MCA could be confirmed.All the patients were divided to one group with myocardial bridge and the other group without that,all the left coronary anterior descending branches were observed with MPR,CPR,VR,the stenosis degree proximal to the myocardial bridge due to the atherosclerotic plaque was calculated,the detection rates of the calcification and atherosclerotic plaque between the two groups were compared respectively.Results：A total of 74 sites of anterior descending branch MB were found in 300 patients,the detection rates of the calcification and atherosclerotic plaque were 36.5% and 54.1% in the myocardial bridge group,and 31.3% and 45.1% in the other group.The mean stenosis degree of the two group were 48.4% and 44.6%.There were no statistical significance between the detection rate of the calcification,atherosclerotic plaque and the mean stenosis degree of the two groups（P=0.40;P=0.18;P=0.97）.Conclusion：The myocardial bridges of the left coronary anterior descending branch arteries do not increase the mean stenosis degree and global detection rate of the atherosclerotic plaque.