Department of Radiology, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea.
Int J Cardiovasc Imaging. 2011 Dec;27 Suppl 1:73-83. doi: 10.1007/s10554-011-9959-2. Epub 2011 Oct 14.
To identify factors that can affect systolic compression of myocardial bridging (MB) of the mid-left anterior descending (LAD) coronary artery with dual-source computed tomography (DSCT). Patients with mid-LAD MB (n = 198) detected by DSCT were studied. MB was classified as incomplete superficial (IS), complete superficial (CS), and deep (D) type. The depth and length of the mid-LAD MB segment in diastole, luminal reduction of the tunneled LAD segment in systole, and degree of systolic left ventricular (LV) wall thickening were all analyzed. Correlation between the depth, length, degree of systolic LV wall thickening, and luminal narrowing in the systolic phase was evaluated. Eighty-one (40.9%) MB were IS, 37 (18.7%) were CS, and 80 (40.4%) were D type. Significant differences in the degree of luminal narrowing in the systolic phase were found among the three MB types (IS, 19.9 ± 10.1%; CS, 26.9 ± 12.1%; D, 36.6 ± 13.8%; P < 0.0001). The luminal narrowing in the systolic phase correlated with the depth (r = 0.56) and percentage of systolic LV wall thickening (r = 0.44), but was not related to length (r = 0.28). In addition to the degree of LV systolic wall thickening and depth of MB, the types of MB also affect luminal narrowing in the systolic phase.
利用双源 CT（DSCT）识别影响左前降支中段心肌桥（MB）收缩期压缩的因素。
研究经 DSCT 检测到的左前降支中段 MB（n = 198）患者。MB 分为不完全浅表型（IS）、完全浅表型（CS）和深部型（D）。分析舒张期左前降支中段 MB 节段的深度和长度、收缩期隧道状左前降支段的管腔狭窄程度和收缩期左心室（LV）壁增厚程度。评估收缩期 LV 壁增厚程度、收缩期管腔狭窄程度与 MB 深度、长度的相关性。
81 例（40.9%）MB 为 IS 型，37 例（18.7%）为 CS 型，80 例（40.4%）为 D 型。三种 MB 类型之间收缩期管腔狭窄程度存在显著差异（IS 型：19.9 ± 10.1%；CS 型：26.9 ± 12.1%；D 型：36.6 ± 13.8%；P < 0.0001）。收缩期管腔狭窄程度与 MB 深度（r = 0.56）和收缩期 LV 壁增厚百分比（r = 0.44）呈正相关，但与长度无关（r = 0.28）。除了 LV 收缩期壁增厚程度和 MB 深度外，MB 的类型也会影响收缩期管腔狭窄程度。
