摘要目的:以三维重建结合计算流体力学的方法探讨原发性三叉神经痛（PTN）患者中是否存在血管神经关系特异性。方法:对2018年1月至2019年12月于郑州大学第二附属医院就诊的20例PTN患者（PTN组）疼痛侧和10例无症状却存在血管接触三叉神经者（对照组）的三叉神经血管接触区域行磁共振数据三维重建，并使用ANSYS 19.2软件对血流、血管壁与神经之间瞬态双向流固耦合模拟，分析比较两组间血管神经接触特点及血管壁对神经压迫情况。结果:PTN组中血管襻曲率［0.21（0.12）mm -1］及血管襻和神经间夹角［69.70（30.67）°］明显大于对照组［分别为0.13（0.07）mm -1， U=34.00， P<0.05；43.40（37.21）°， U=38.00， P<0.05］，且PTN组［（4.23±1.29）mm］较对照组［（5.54±1.85）mm， t=-2.26， P<0.05］血管襻压迫神经部位更接近神经入脑干处。PTN组中血管壁对神经产生的平均剪切应力［15 952.48（5 365.56）Pa］和平均等效应力［24 965.65（7 693.22）Pa］明显高于对照组［分别为12 501.97（6 355.26）Pa， U=53.00， P<0.05；14 992.99（9 824.08）Pa， U=32.00， P<0.05］。血管襻弯曲程度与平均剪切应力（ r=0.931， P<0.05）和等效应力（ r=0.962， P<0.05）呈正相关；受压部位神经形变与平均剪切应力（ r=0.787， P<0.05）和等效应力（ r=0.853， P<0.05）呈正相关。 结论:在PTN患者中存在异常的神经血管冲突，主要表现在血管明显屈曲、血管压迫神经根部以及血管襻平面以更大的夹角压迫神经。而这些结构的异常能导致神经受力异常。

abstractsObjective:To investigate specificity of neurovascular compression in patients with primary trigeminal neuralgia (PTN) by three-dimension reconstruction and computational fluid dynamics.Methods:Clinical characteristics and preoperative magnetic resonance imaging (MRI) data of 20 patients with both PTN and single artery compression (PTN group) and 10 patients without PTN but having neurovascular contact in MRI images (control group) in the Second Affiliated Hospital of Zhengzhou University from January 2018 to December 2019 were collected and analyzed. After three-dimension reconstruction of the MRI images, curvature of the arterial loop, angle between the plane of arterial loop and the trigeminal nerve and location of the compression were observed. Then bidirectional structure-fluid coupling based on the optimized stereolithography models of arterial loop and nerve were processed by ANSYS 19.2 software. In the location of the compression of contact, equivalent stress (ES) of arterial loop on the nerve, shearing stress (SS) of the blood flow and local deformation of the nerve were iteratively computed. All parameters were analyzed and compared between the PTN group and the control group, and the correlation analysis was proceeded between the anatomical parameters and hemodynamical parameters.Results:The curvature of arterial loop [0.21(0.12) mm -1vs 0.13(0.07) mm -1, U=34.00, P<0.05], the angle between vascular loop and nerve [69.70(30.67)° vs 43.40(37.21)°, U=38.00, P<0.05] in the PTN group were significantly greater than those in the control group, and the location of compression was significantly closer to the root of nerve in the PTN group [PTN group: (4.23±1.29) mm vs control group: (5.54±1.85) mm, t=-2.26, P<0.05]. The average SS [15 952.48(5 365.56) Pa vs 12 501.97(6 355.26) Pa, U=53.00, P<0.05], ES [24 965.65(7 693.22) Pa vs 14 992.99(9 824.08) Pa, U=32.00, P<0.05] in the PTN group were significantly greater than those in the control group. The curvature of arterial loop was positively correlated with the SS ( r=0.931, P<0.05) and ES ( r=0.962, P<0.05), and the latter two ( r=0.787, P<0.05; r=0.853, P<0.05) were positively correlated with the local neural deformation. Conclusions:In patients with PTN, offending artery compresses the root of nerve by greater arterial curvature and angle between the arterial loop and nerve. These anatomical differences will cause significantly greater SS, ES and local neural deformation.