Myocardial Bridge And Influence On Coronary Atherosclerosis: Preliinary Study On 64-MSCT

Part one :Purpose To discuss the prevalence of MB-MCA detected by 64-MSCT and themorphological characteristics of myocardial bridge-mural coronary artery(MB-MCA).Materials and Methods The images of 1086 patients with suspected ordocumented coronary artery disease who underwent 64-MSCT were analyzedretrospectively by 2 cardiovascular radiologists. When consistency was obtainedby the independent interpretations, the diagnosis of MB-MCA could be confirmed.The length of MCA and thickness of MB were measured, and situation of MB,encasement form of MCA and adjacent vessel morphology were assessed.Results Among 1086 patients, 439 sites of MB-MCA were detected in415(38.21%) cases. 87.24% (383/439) of MB-MCA were located on the LAD.MCA could be encased partially by MB(66.06%,290/439) or covered completely(33.94%, 149/439. The proximal and distal segment to the MB-MCA showtortuous in 73.57% of the cases.The length of MCA was 12.06±5.77mm, thethickness of MB was 2.63±1.63mm. There is mild correlation between the lengthof MCA and the thickness of MB.Conclusions 64-MSCT provides a non-invasive diagnostic tool for MB-MCAand provides an accurate demonstration of the anatomical characteristics ofMB-MCA. MB-MCA is mainly located on the middle segment of LAD.Part two:Purpose To discuss the influence of myocardial bridge-mural coronary artery(MB-MCA) in LAD on coronary atherosclerosis.Material and Methods The images of 1086 patients with suspected ordocumented coronary artery disease who underwent 64-MSCT were analyzedretrospectively by 2 cardiovascular radiologists. When consistency was obtainedby the independent interpretations, the diagnosis of MB-MCA could be confirmed.(1) LAD with MB-MCA was divided into three segments, including the proximalsegment, MCA segment and the distal segment, the occurrence of plaque in threesegments was compared. The occurrence of AS in patients with and without MBwas analyzed.Results The occurrence of AS in the proximal segment, per se MCA and distalsegment were 47.54%, 0.25% and 0.49%, respectively. The occurrence of AS was47.54% in the LAD burdened MB and 63.53% without MB.Conclusion The atherosclerosis ratio in the coronary artery segment proximal toMB-MCA is higher than MCA itself and the distal segment of MB-MCA .Theoccurrence of AS is lower in patients with MB than in patient without MB.