Abstract:

Objective　To study the morphologic features of myocardial bridge-mural coronary (MB-MCA) by dual-source CT (DSCT), and improve the understanding of it on clinical diagnosis value. Methods　3709 patients were involved in this study. MB-MCAs were located accurately according to the guideline of the American Heart Association, and the length, depth, compression of MB-MCA and concomitant atheromatous changes were evaluated.　Results　638 cases had MB-MCA in overall 3709 patients by DSCT, getting the prevalence of 17.20%. 654 MB-MCA were detected including 426 in segment 7, 72 in segment 8 and 56 in segment 6, the rest distributing in segment 2, 3, 4, 9, 11, 12,13 and 16. Of 654 MB-MCA, the mean length was (20.52±9.84）mm and the mean thickness was（1.27±0.93）mm. The lumen of MCA showed no significant stenosis or mild to moderate stenosis, and a rare severe stenosis. 92 patients with MB-MCA had atherosclerotic plaque.　Conclusions　DSCT not only may directly demonstrate the dissection shape of MB-MCA, but might also dynamically evaluate the change of MB-MCA in the entire cardiac cycle, supplying the clinical significance research of MB-MCA for valuable information.

Key words:  Myocardial bridging, Mural coronary artery, X-ray computer, Tomography