Abstract：Objective: To investigate the depiction rate and morphologic features of myocardial bridge and mural coronary artery(MB-MCA) with dual-source CT(DSCT) coronary angiography. Materials and Methods: Four hundred and seventy cases of patients underwent DSCT coronary angiography. The length and thickness of MB, the degree of systolic compression of MCA were measured expressed with the means±standard deviations. The situation of the MCA and the nearby arteries of MB-MCA were observed and recorded. Statistical analysis were performed with Pearson correlation analysis and the Wilcoxon two-sample test. Results: ①MB-MCA was detected with DSCT in 131(27.9%) of 470 patients. Mean MB length and depth at DSCT were (20.8±9.0)mm and (2.3±1.1)mm, respectively. The degree of systolic compression was (37.8±16.9)%. A significant correlation was not found between systolic compression and length(r=0.17, P=0.540) but was found with depth(r=0.60, P=0.000). A significant correlation was not found between depth and length(r=0.18, P=0.101). ②62.7%(82 cases) of the arteries proximal or/and distal to the MB-MCA were tortuous. A significant correlation was found between tortuous degree and the depth of MB(z=-3.15, P=0.002). ③The MCA had cone-shaped change in systole and significantly reduced or disappeared in diastole in 67 cases. These features had significant correlation with depth and length of MB(z=-2.91, P＝0.004; z=-2.61, P＝0.009). ④Arteriosclerotic signs in 46 cases were found in neighboring arteries of the MCA. The depth and the length of MB were related to the arteriosclerosis(z=-3.42, P＝0.001; z=-2.89, P＝0.004). Conclusion: DSCT may diagnose correctly the presence and may judge the morphological characteristic of MB-MCA, which can provide more worthy information for clinical diagnosis and treatment.
2009, Vol. 20 
