Myocardial bridging of the left anterior descending coronary artery: depiction rate and morphologic features by dual-source CT coronary angiography

• Published in: Korean journal of radiology Vol. 11; no. 5; pp. 514 - 521
• Main Authors: Hwang, Jin Ho, Ko, Sung Min, Roh, Hong Gee, Song, Meong Gun, Shin, Je Kyoun, Chee, Hyun Kun, Kim, Joon Suk
• Format: Journal Article
• Language: English
• Published: Korea (South) The Korean Society of Radiology 01.09.2010; 대한영상의학회
• Subjects: Cardiac arrhythmia; Cardiovascular disease; Congenital diseases; Contrast Media; Coronary Angiography - methods; Coronary vessels; Data analysis; Electrocardiography; Female; Heart; Humans; Iohexol - analogs & derivatives; Male; Medical imaging; Middle Aged; Myocardial Bridging - diagnostic imaging; Original; Patients; Radiographic Image Interpretation, Computer-Assisted; Retrospective Studies; Software; Statistical analysis; Tomography, X-Ray Computed - methods; Variance analysis; Work stations; 방사선과학; Computed tomography (CT); Myocardial bridging; CT coronary angiography; Dual-source CT; Conventional angiography; Coronary arteries
• ISSN: 1229-6929; 2005-8330
• DOI: 10.3348/kjr.2010.11.5.514

To evaluate the depiction rate and morphologic features of myocardial bridging (MB) of the left anterior descending coronary artery (LAD) using dual-source CT (DSCT). CT scans from a total of 1,353 patients who underwent DSCT were reviewed retrospectively for LAD-MB. Seventy-eight patients were excluded due to poor image quality or poor enhancement of the coronary artery. The length and depth of the MB were analyzed and classified as superficial or deep with respect to the depth (<or= 1 or > 1 mm) of the LAD tunneled segment. Superficial MB was subdivided into complete or incomplete types according to full or partial encasement of the myocardium. Of the 1,275 patients included in this study, 557 cases of MB were found from 536 patients (42%). Superficial MB was observed in 368 of 557 (66%) cases, and deep MB was seen in 189 of 557 (34%) cases. Superficial MB showed 2 types: complete (128 of 368, 35%) and incomplete (240 of 368, 65%). The mean length of a tunneled segment for superficial MB was 16.4 +/- 8.6 mm. The mean length and depth of a tunneled segment for deep MB were 27.6 +/- 12.8 mm and 3.0 +/- 1.4 mm, respectively. The incidence of atherosclerotic plaques in a 2-cm-long segment proximal to MB was 16%. The depiction rate of LAD-MB using DSCT in a large series of patients was 42%, with two-thirds of MB segments being the superficial type.