新疆汉族、维吾尔族左冠状动脉分叉夹角及左主干长度与夹角区动脉粥样硬化的MSCT相关性研究

目的　利用MSCT分析维吾尔族与汉族左冠状动脉分叉夹角（LAD-LCX）及左主干长度（LM）与冠状动脉夹角区动脉粥样硬化的关系。 方法　回顾性分析本地区6所医院行冠状动脉CTA检查患者资料，将左冠状动脉主干分叉区按管腔狭窄受累情况分为Ⅰ~Ⅳ级，分析比较维吾尔族及汉族不同分级之间的左冠状动脉分叉夹角及左主干长度差异；分析左冠状动脉分叉夹角与左主干长度的相关性。 结果　纳入研究1276例，汉族916例，维吾尔族360例。汉族左冠状动脉夹角均值为(84±38.8)º(29º~158º), 左冠状动脉主干长度均值为(9.2±5.3)mm(1.6~28.6 mm)；维吾尔族左冠状动脉夹角均值为(85±34)º(24º~155º)，LM长度均值为(9.6±6.6)mm(2.4~18.3mm)。维吾尔族与汉族的左冠状动脉夹角在Ⅰ级与Ⅱ、Ⅲ、Ⅳ级之间差异有统计学意义，而Ⅱ、Ⅲ、Ⅳ级之间的左冠状动脉夹角差异无统计学意义。两民族左冠状动脉分叉夹角与左冠状动脉主干长度均呈中度相关(汉族R=0.307;维吾尔族R=0.421)。 结论　大的冠状动脉夹角及更长的左主干长度更容易引起夹角区冠状动脉硬化，但与夹角区管腔受累程度没有明显相关性；左冠状动脉分叉夹角与左冠状动脉主干长度呈中度相关,维吾尔族略高于汉族。

The relationship between bifurcation angle and main trunk length and atherosclerosis of left coronary artery in Uighur and Han

Objective　To analyzed the relationship between the bifurcation angle and the length of the main trunk and the atherosclerosis of the left Coronary artery in Uighur and Han by MSCT.　Methods Coronary artery CTA imaging data of six hospitals from 2013.6 to 2014.12 was retrospectively analyzed. Patients were classified asⅠ~Ⅳ types according to the degree of luminal stenosis of at the left coronary bifurcation region. Comparison the different types of the bifurcation angle, and the relationship between the bifurcation angle and the length of the main trunk of the left Coronary artery was performed.　Results　The study enrolled 1276 cases, in which 916 cases were of Han ethnicity, and 360 cases of Uighur ethinicity. The bifurcation angle of Han was (84±38.8)º , with a range of (29º~158º); the length of the main trunk was (9.2±5.3) mm, with a range (1.6~28.6 mm); In Uighur the bifurcation angle was (85±34)º, with a range (24º~155º); the length of main trunk length was (9.6±36.6) mm, with a range (2.4~18.3 mm). There was significant difference amongⅠand Ⅱ, Ⅲ and Ⅳ types and no significant difference among Ⅱ, Ⅲ or Ⅳ types in either Han or Uighur ethnicity. There was moderate correlation between the bifurcation angle and the length of the main trunk of the left coronary artery (Han R= 0.307; Uighur R=0.421).　Conclusion　A larger left coronary bifurcation angle and a greater length of the left main trunk are more likely to cause coronary artery atherosclerosis in the bifurcation region, but there is no significant correlation with the degree of luminal stenosis. The left coronary bifurcation angle is moderately related to the length of the main trunk of the left coronary artery, and the Uighur is slightly higher than Han.