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| The study of correlation between the severity of systolic compression of the mural coronary artery andlength and depth of myocardial bridge evaluated by 128-slice spiral CT |
| NIU Yu-jun, CAO A-dan, LENG Bing, LIU Ning, JIA Mei-xia, ZHAO Kun |
| Department of Radiology, First Affiliated Hospital of Liaoning Medical University, Jinzhou Liaoning 121001, China |
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Abstract Objective: To discuss the correlation between the severity of systolic phase compression of the mural coronary artery(MCA) and length and depth of myocardial bridge(MB) evaluated by 128-slice SCT. Method: 580 cases examined by multi-slice spiral CT coronary artery angiography(MSCTCA) were analyzed to observe the presence, location and occurrence rate of MB-MCA. Taking LAD as the research object, the length and depth of MB, the degree of systolic phase compression of MCA were measured. All the research objects were divided into mild, moderate or severe stenostic groups according to degree of systolic phase compression of MCA, and then the difference in the length and depth of each MB-MCA was compared among groups. Results: 140 MB-MCAs were found in 580 patients, with an incidence rate of 24.14%. 104 lesions(74.3%) were in the middle part of LAD, 16 lesions(11.4%) in the distal part, 8 lesions(5.7%) in obtuse marginal branch, 7 lesions(5.0%) in the first diagonal branch, 3 lesions(2.1%) in intermediate branch, 2 lesions(1.5%) in posterior descending branch of right coronary artery. In LAD, the MB length ranged from 8 mm to 46 mm and depth ranged from 0.7 mm to 4.4 mm, with the average length of (21.80±5.98) mm and the average depth of (2.15±0.74) mm. The average compression degree was (38.5±19.6)%. MB was not different in length among different groups(P>0.05), but was different in depth(P<0.05). MCA systolic compression was positively correlated with MB depth(r=0.408, P<0.05), but not with the length of MB(r=0.076, P>0.05). Conclusion: 128-slice SCTCA can accurately display the anatomical relationship between the MCA and myocardial tissue and is a preferred method to diagnose MB-MCA. To evaluate the correlation of the degree of MCA systolic compression and MB length and depth can provide the basis for the clinic.
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Received: 19 April 2011
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2012, Vol. 23 
