| Objective：1.To investigate the detection ratio and positional distributionof MB-MCA.2. To explore the morphological of LAD MB by affected theheart rate.3. To evaluate the relationship between morphological features ofMB and the consolidation of adjacent vessels with MCA.Materials and methods： Among the657participants for DSCTcoronary angiography in Sichuan Academy of Medical Sciences SichuanProvincial People’s Hospital from September4th2013to November30th2013, and their clinical image data and basic information were recorded,including413males and244females. A total of203cases were diagnosedwith MB-MCA. There were190cases with single LAD MB entered into theassessment of image quality. There were186participants entered intoMorphological observation. MB types including incomplete, superficial anddeep. Image quality of coronary artery was ranged from1st to4th. MCA,sdegree of systolic compression include mild, moderate and severe groups. Therelationship between the heart rate and image quality, and morphologicalfeatures of MB and the consolidation of MCA adjacent vessels are statisticalanalysis.Results：1. Detection rate of MB was30.90%(203/657), which were nosignificant difference between males (32.69%) and females (27.87%). MBwas primarily found on LAD (94.58%,192/203), and the ratio was muchhigher on the Middle section of LAD (79.69%,153/192). 2. There was no correlation between heart rate and overall image qualityof coronary artery (P>0.05). The image quality of RCA was significantdifference between systolic and diastolic in Comparison (P<0.05), theopposite were LAD and LCX (P>0.05). The level of heart rate was nosignificant affect on the image quality of coronary artery in systolic，theopposite was in diastolic, which affected the most significant was RCA(P<0.05), followed by LAD (P=0.05) and LCX (P=0.052).3. There had75participants of incomplete MB,63participants ofsuperficial MB and48participants of deep MB. Length of MB ranged from6.0mm to48.3mm, with the average19.7±8.5mm. There were no significantdifference between the three types in length of MB (P>0.05). Incomplete typeof MB was no index of depth. The depth of complete MB ranged from0.2to4.3mm (1.33±0.93). The depth of superficial and deep MB was (0.66±0.29)mm and (2.20±0.73) mm. There was no correlation between depth and lengthin the complete type MB (P>0.05).4. Incomplete MB than complete MB to light with the compressionextent in systolic of MCA, superficial MB than deep MB to light on the same(P<0.05). There was significant difference among groups about compressionextent in systolic of MCA in the size of the depth with complete MB (P<0.05),and the length of MB is no (P>0.05).5. There was significant difference between MB types in the occurrencerate of vascular tortuosity nearby MCA (P<0.05), and incomplete MB,superficial MB, deep MB successively increases.6. There was significant difference between MB types in the incidence ofAS on MCA adjacent vessels (P<0.05), and incomplete MB, superficial MB,deep MB successively increases. Conclusion: Detection rate of MB was30.90%, and males had a higherpositive rate of MB than females, which were no significant differencebetween males (32.69%) and females (27.87%). MB was primarily found onthe middle section of LAD. It was no correlation between heart rate andoverall image quality of coronary artery. It had not affect morphologyassessment of MB with heart rate. The systolic compression degree of MCA,the angular rate of blood vessels within2cm of it and incidence ofatherosclerosis are related to several factors: the shape which MCA wrappedaround by myocardial fiber incomplete or completely and the thickness ofcompletely MB, but is irrelevant to the length of MB. |
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