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Original research
Morphologic and hemodynamic analysis of paraclinoid aneurysms: ruptured versus unruptured
  1. Jian Liu1,
  2. Jianping Xiang2,
  3. Ying Zhang1,
  4. Yang Wang1,
  5. Haiyun Li3,
  6. Hui Meng2,
  7. Xinjian Yang1
  1. 1Department of Interventional Neuroradiology, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University, Beijing, China
  2. 2The Mechanical and Aerospace Engineering Department and Toshiba Stroke Research Center, University at Buffalo, State University of New York, Buffalo, New York, USA
  3. 3Department of Biomedical Engineering, Capital Medical University, Beijing, China
  1. Correspondence to Dr Xinjian Yang, Department of Interventional Neuroradiology, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili, 6#, Beijing 100050, China; yang-xj{at}163.net

Abstract

Background In 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.

Methods 107 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.

Results Aneurysms 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, χ2 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.

Conclusions Irregular 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.

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