Primary Study Of Myocardial Bridges By Dual Source Coronary CTA

Objective To observe the ability of CT coronary artery(CTA)to display the myocardial bridge(MB)and to investigate the relationship between the location,length,thickness of MB and the occurrence of coronary atherosclerosis.Materials and Methods Clinical image data of 83 patients with MB found in 985 cases of dual-source coronary CTA were retrospectively analyzed.The location,the thickness of the myocardial bridge and the length of the coronary artery(MCA)were measured.MBs were divided into superficial and deep types: the coronary arteries are surrounded by more than half of the myocardium as superficial MB;the coronary arteries are completely surrounded by myocardial fibers called deep MB.The relationship between the type of MB and the occurrence of coronary atherosclerosis was observed.Results 86 MBs were detected,among which 59(68.6%)occurred in the middle of the LAD,9(10.5%)in the LAD,and coexisted in the mid and distal LAD.There were 3cases(6.9%),and other(DA1,LCX,OM,RCA)were 12 cases(14.0%).There are 34 deep MBs and 49 superficial MBs.Atherosclerosis was found in proximal vessels of 22 cases(22/34)in the deep MB group,8 cases(8/49)of proximal atherosclerosis were detected in the superficial MB group,and atherosclerosis was found between the two groups.The difference in the incidence of cirrhosis was statistically significant(Χ2=20.355,P=0.011).In the atherosclerotic group,the length of the MB was 5-75 mm,with an average of 37.3 ±15.2mm,and the thickness was 1-6.5mm,with an average of 2.66±0.61mm;the atherosclerosis group had a 5-60 mm length of MB,the average 21.7±8.6mm,thickness of0.3-4mm,average 1.5 ± 0.52mm;difference in thickness/length of MB between the two groups was statistically significant(P <0.005).Conclusions 1.The coronary CTA can clearly show the morphological features of MB-MCA and its anatomical relationship with the surrounding tissue.2.The MB occurs in the middle of the LAD,and the probability of atherosclerosis in the proximal vessel of the deep MB is greater.3.The length and thickness of the myocardial bridge are related tocoronary artery atherosclerosis in the proximal part of the MB.