中文摘要：

背景：心肌内冠的动脉被称为的 epicardial 分割的肌纤维 overlying 心肌的衔接(MB ) 。MB 的可变流行与小、大的样品尺寸研究在尸体和 angiographic 系列被描述了。另外，没有类似的学习在中国人口被报导。这研究的目的是调查 MB 的 angiographic 流行在连续有从我们的中心的胸痛的 37,106 个中国病人。方法：我们进行了观察研究在经历的病人之中与 MB 评估连续案例选择冠的血管造影术，并且在很大的样品尺寸的这研究分析了 angiograhic 流行和 MB 的临床的特征。结果：在有胸痛的 37 105 个病人之中，我们以一种回顾的方式与 1011 MB 发现了 1002 个案例，并且全面流行是 2.70% 。尽管(991/1002 ) 超过 99% 病人有单个桥牌， 8 个案例被发现有超过二 MB (七与二，和一与三) 。没有动脉粥样硬化患者损害，总的来说 54.39% 案例(545/1002 ) 有 MB，并且(973/1011 )96.24% 在左前面的下降冠的动脉(男孩) 衔接定位了，主要在男孩的中间(792/1011， 78.33%) 。根据诺贝尔分类，单个桥(n=991 ) ，阻塞的 【50% 是占优势的(471/991， 47.52%) 。完全， 50%-69% 占了 34.81%(345/991 ) ，阻塞的 】70% 是 17.65%(175/991 ) 。结论：这些数据证明在有胸痛的中国病人的 angiographically 可检测的 MB 的流行类似于以前的研究的那些，与在这种很大的样品尺寸的 2.7% 流行。

英文摘要：

Background Muscle fibers overlying the intramyocardial segment of an epicardial coronary artery are termed myocardial bridging （MB）. Variable prevalence of MB has been described at autopsy and angiographic series with small and large sample size studies. In addition, no similar study was reported in Chinese population. The aim of this study was to investigate the angiographic prevalence of MB in consecutive 37 106 Chinese patients with chest pain from our center. Methods We conducted an observational study to evaluate the consecutive cases with MB among patients undergone selective coronary angiography, and analyzed the angiograhic prevalence and clinical features of MB in this study of very large sample size. Results Among 37 105 patients with chest pain we found 1002 cases with 1011 MBs in a retrospective manner, and the overall prevalence was 2.70%. Although more than 99% （991/1002） of patients had single bridge, 8 cases were found to have more than two MBs （seven with two, and one with three）. Altogether 54.39% of cases （545/1002） had MB without atherosclerotic lesions, and 96.24% （973/1011） of bridging located in the left anterior descending coronary artery （LAD）, mainly in the middle of LAD （792/1011,78.33%）. According to Nobel classification, of the single bridge （n=-991）, 〈50% of obstruction was predominant （471/991,47.52%）. Totally 50%-69% accounted for 34.81% （345/991）, 〉70% of obstruction was 17.65% （175/991）. Conclusions These data showed that the prevalence of angiographically detectable MB in Chinese patients with chest pain was similar to those of the previous studies, with 2.7% prevalence in this very large sample size.