• Jian Liu, Jianping Xiang, Ying Zhang, Yang Wang, Haiyun Li, Hui Meng, and Xinjian Yang.
• Department of Interventional Neuroradiology, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
• J Neurointerv Surg. 2014 Nov 1; 6 (9): 658-63.

BackgroundIn order to determine the risk factors related to aneurysm rupture, we studied the aneurysms at the paraclinoid segment of the internal carotid artery by applying morphologic and hemodynamic numerical analyzes.Methods107 patients with 110 paraclinoid aneurysms (26 ruptured, 84 unruptured) were analyzed using computational fluid dynamics based on patient-specific three-dimensional geometrical models. A series of morphologic and hemodynamic parameters were evaluated to find the potential indicators of aneurysm rupture.ResultsAneurysms with an irregular shape accounted for 23.1% of the ruptured group and only 8.3% of the unruptured group. The difference was statistically significant (p=0.042, χ(2) test). Ruptured paraclinoid aneurysms were found to be significantly smaller than unruptured aneurysms (p=0.041), which is different from the results of most previous studies. Energy loss (EL) and inflow concentration showed a level of statistical significance to assess the risk of rupture in paraclinoid aneurysms. By multivariate logistic regression analysis, aneurysm shape (regular or irregular), EL and inflow concentration were retained as independently significant parameters. The odds of rupture were increased by 1.65 times for a 10% increase in EL, by 4.88 times for an aneurysm with an irregular shape and by 2.91 times for an aneurysm with concentrated inflow jet.ConclusionsIrregular shape, larger EL and concentrated inflow jet were independently associated with the rupture status of paraclinoid aneurysms. These findings need to be further confirmed based on large multicenter and multipopulation data.Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

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