利用64列多排偵檢器電腦斷層掃描儀偵測左前降枝冠狀動脈心肌橋及近端血管動脈粥狀硬化的發生率

Prevalence Rate of Myocardial Bridge and Atherosclerosis Proximal to the Bridge in the Left Anterior Descending Coronary Artery Detected by 64 MDCT

劉雅萍(Ya-Ping Liu) ； 王梓軒(Tzu-Hsuan Wang) ； 侯貴圓(Kuei-Yuan Hou) ； 曾文昌(Wen-Chan Tszen) ； 賴世育(Shieh-Yu Lai) ； 王永成(Yuan-Chen Wang) ； 莫元亨(Yuan-Heng Mo)

《輔仁醫學期刊》 7卷3期 (2009/12) Pp. 103-111

摘要

Background and Purpose: A myocardial bridge (MB) is a congenital coronary anomaly resulting in systolic narrowing of the coronary artery. The purposes of this study were to assess the prevalence rate of MB and evaluate the relation between MBs and atherosclerosis proximal to the bridges in the left anterior descending coronary artery (LAD) using 64 multiple detector row computed tomography (MDCT). Materials and Methods: In total, 358 subjects either with or without cardiac symptoms who underwent CT coronary angiography were included in the study. The prevalence, thickness, length, and location of the MBs and atherosclerosis proximal to the bridge were evaluated. Results: We found that 22.4% (80/358) of subjects had an MB in the LAD. The mid-LAD was the most common site (17.4%). Forty-one subjects had atherosclerosis proximal to the MB. No atherosclerosis was found in the bridged segment. The mean thickness and length of bridge were 1.2±1.1 and 13.7±6.9mm, respectively. The presence of atherosclerosis in the LAD segment proximal to the MB and the severity of atherosclerosis in these segments were not related to the length or depth of the bridge. Conclusions: The prevalence rate of MB in our group was higher (22.4%) than those of previous angiographic reports (0.5%~2.5%). Segments proximal to the myocardial bridge had a higher frequency of atherosclerosis, whereas the MB segment was spared. MDCT is a reliable, less-invasive technique for diagnosing MBs and evaluating the anatomical properties of MBs.

並列摘要

Background and Purpose: A myocardial bridge (MB) is a congenital coronary anomaly resulting in systolic narrowing of the coronary artery. The purposes of this study were to assess the prevalence rate of MB and evaluate the relation between MBs and atherosclerosis proximal to the bridges in the left anterior descending coronary artery (LAD) using 64 multiple detector row computed tomography (MDCT). Materials and Methods: In total, 358 subjects either with or without cardiac symptoms who underwent CT coronary angiography were included in the study. The prevalence, thickness, length, and location of the MBs and atherosclerosis proximal to the bridge were evaluated. Results: We found that 22.4% (80/358) of subjects had an MB in the LAD. The mid-LAD was the most common site (17.4%). Forty-one subjects had atherosclerosis proximal to the MB. No atherosclerosis was found in the bridged segment. The mean thickness and length of bridge were 1.2±1.1 and 13.7±6.9mm, respectively. The presence of atherosclerosis in the LAD segment proximal to the MB and the severity of atherosclerosis in these segments were not related to the length or depth of the bridge. Conclusions: The prevalence rate of MB in our group was higher (22.4%) than those of previous angiographic reports (0.5%~2.5%). Segments proximal to the myocardial bridge had a higher frequency of atherosclerosis, whereas the MB segment was spared. MDCT is a reliable, less-invasive technique for diagnosing MBs and evaluating the anatomical properties of MBs.

並列關鍵字

myocardial bridge MB ； LAD ； atherosclerosis ； 64 MDCT