Associations between haemodynamics and wall enhancement of intracranial aneurysm

作者：Miaoqi Zhang, Fei Peng, Xin Tong, Xin Feng, Yunduo Li, Huijun Chen, Hao Niu, Baorui Zhang, Guangrong Song, Youxiang Li, Peng Liu, Aihua Liu, Rui Li · 发表于：Stroke and Vascular Neurology · 年份：2021 · DOI：10.1136/svn-2020-000636 · 被引用次数：36 · 研究领域：Intracranial Aneurysms: Treatment and Complications、Cerebrospinal fluid and hydrocephalus、Intracerebral and Subarachnoid Hemorrhage Research

Background and purpose Previous studies have reported about inflammation processes (IPs) that play important roles in aneurysm formation and rupture, which could be driven by blood flow. IPs can be identified using aneurysmal wall enhancement (AWE) on high-resolution black-blood MRI (BB-MRI) and blood flow haemodynamics can be demonstrated by four-dimensional-flow MRI (4D-flow MRI). Thus, this study investigated the associations between AWE and haemodynamics in unruptured intracranial aneurysms (IA) by combining 4D-flow MRI and high-resolution BB-MRI. Materials and methods Between April 2014 and October 2017, 48 patients with 49 unruptured IA who underwent both 4D-flow MRI and high-resolution BB-MRI were retrospectively included in this study. The haemodynamic parameters demonstrated using 4D-flow MRI were compared between different AWE patterns using the Kruskal-Wallis test and ordinal regression. Results The results of Kruskal-Wallis test showed that the average wall shear stress in the IA (WSS avg-IA ), maximum through-plane velocity in the adjacent parent artery, inflow jet patterns and the average vorticity in IA (vorticity avg-IA ) were significantly associated with the AWE patterns. Ordinal regression analysis identified WSS avg-IA (p=0.002) and vorticity avg-IA (p = 0.033) as independent predictors of AWE patterns. Conclusion A low WSS and low average vorticity were independently associated with a high AWE grade for IAs larger than 4 mm. Therefore, WSS and average vor...