64排螺旋CT评价心肌桥及其与冠状动脉粥样硬化的相关性

目的：观察64排螺旋CT对心肌桥显示情况，分析心肌桥与冠状动脉粥样硬化的相关性。方法选择2011年2月至2013年6月间我院心内科存在心肌桥患者99例为研究对象，均接受64排螺旋CT冠状动脉成像检查。对心肌桥进行定位、计数、长度/厚度测量，观察相应冠状动脉发生动脉硬化情况。结果64排螺旋CT共检查心肌桥109处，其中LAD中段比例最高（63.3%），心肌桥平均长度（17.4±2.5） mm，厚度（2.5±0.8） mm。桥前段冠状动脉硬化（87.3%）比较显著高于桥后段（12.7%），差异具有统计学意义（χ2=79.1，P〈0.05）。完全型心肌桥发生冠状动脉硬化（80.3%）显著高于不完全型心肌桥（45.8%），差异具有统计学意义（χ2=14.0，P〈0.05）。发生冠状动脉硬化者心肌桥长度为（17.6±2.6） mm，与未发生冠状动脉硬化者的（17.1±2.2） mm比较，差异无统计学意义（t=1.8，P〉0.05）。结论64排螺旋CT可以清晰显示心肌桥，以LAD中段最常见；冠状动脉硬化与心肌桥存在关联性。

Application value of 64 slice spiral CT in coronary myocardial bridge and its correlation with coronary atherosclerosis

Objective To investigate the value of 64 slice spiral CT in myocardial bridge （MB）, and analyze the correlation between myocardial bridge and coronary atherosclerosis. Methods Ninety-nine patients with MB were chosen as research objects, which received 64 slice spiral CT coronary artery imaging. The localization, count, length and thickness of MB were measured, and the corresponding coronary artery atherosclerosis was analyzed. Results 64 slice spiral CT examination showed 109 MBs, in which LAD accounted for the highest proportion （63.3%） with an average length of （17.4±2.5） mm and thickness of （2.5±0.8） mm. The occurrence rate of coronary atherosclerosis proximal to MB was significantly higher than that of coronary atherosclerosis distal to MB （87.3%vs 12.7%,χ2=79.1, P〈0.05）. The occurrence of coronary atherosclerosis in complete MB was significantly higher than that in incomplete MB （80.3%vs 45.8%,χ2=14.0, P〈0.05）. The length of MB in patients with coronary arteriosclerosis was not statistically significantly different from that in patients without coronary arteriosclerosis （17.6 ± 2.6） mm vs （17.1 ± 2.2） mm, t=1.8, P〈0.05]. Conclusion 64 slice spiral CT could show MB clearly, in which LAD was the most common. There was a close relationship between coronary atherosclerosis and MB.