Ma En-sen, Ma Guo-lin, Yu Hong-wei, Wu Wang, Li Kefeng
Department of Radiology, China-Japan Friendship Hospital, East Yinghua Road, He Pingli, Chao Yang District, Beijing 100029, China.
ScientificWorldJournal. 2013 May 20;2013:947876. doi: 10.1155/2013/947876. Print 2013.
Recent clinical reports have indicated that myocardial bridge and mural coronary artery complex (MB-MCA) might cause major adverse cardiac events. 256-slice CT angiography (256-slice CTA) is a newly developed CT system with faster scanning and lower radiation dose compared with other CT systems. The objective of this study is to evaluate the morphological features of MB-MCA and determine its changes from diastole to systole phase using 256-slice CTA. The imaging data of 2462 patients were collected retrospectively. Two independent radiologists reviewed the collected images and the diagnosis of MB-MCA was confirmed when consistency was obtained. The length, diameter, and thickness of MB-MCA in diastole and systole phases were recorded, and changes of MB-MCA were calculated. Our results showed that among the 2462 patients examined, 336 have one or multiple MB-MCA (13.6%). Out of 389 MB-MCA segments, 235 sites were located in LAD2 (60.41%). The average diameter change of MCA in LAD2 from systole phase to diastole phase was 1.1 ± 0.4 mm, and 34.9% of MCA have more than 50% diameter stenosis in systole phase. This study suggested that 256-slice CTA multiple-phase reconstruction technique is a reliable method to determine the changes of MB-MCA from diastole to systole phase.
近期临床报告表明，心肌桥与壁冠状动脉复合体（MB-MCA）可能导致主要不良心脏事件。256层CT血管造影（256层CTA）是一种新开发的CT系统，与其他CT系统相比，扫描速度更快且辐射剂量更低。本研究的目的是使用256层CTA评估MB-MCA的形态特征，并确定其从舒张期到收缩期的变化。回顾性收集了2462例患者的影像数据。两名独立的放射科医生对收集的图像进行了评估，当达成一致意见时确诊为MB-MCA。记录了舒张期和收缩期MB-MCA的长度、直径和厚度，并计算了MB-MCA的变化。我们的结果显示，在2462例接受检查的患者中，336例有一处或多处MB-MCA（13.6%）。在389个MB-MCA节段中，235个部位位于前降支2段（60.41%）。前降支2段中MCA从收缩期到舒张期的平均直径变化为1.1±0.4毫米，34.9%的MCA在收缩期直径狭窄超过50%。本研究表明，256层CTA多期重建技术是确定MB-MCA从舒张期到收缩期变化的可靠方法。
