• Hiroyuki Takao, Yuichi Murayama, Shinobu Otsuka, Yi Qian, Ashraf Mohamed, Shunsuke Masuda, Makoto Yamamoto, and Toshiaki Abe.
• The Jikei University School of Medicine, Department of Neurosurgery, Tokyo, Japan. takao@jikei.ac.jp
• Stroke. 2012 May 1;43(5):1436-9.

Background And PurposeWe evaluated several hemodynamic parameters for the prediction of rupture in a data set of initially unruptured aneurysms, including aneurysms that ruptured during follow-up observation.MethodsAneurysm geometry was extracted from CT angiographic images and analyzed using a mathematical formula for fluid flow under pulsatile blood flow conditions. Fifty side-wall internal carotid posterior communicating artery aneurysms and 50 middle cerebral artery bifurcation aneurysms of medium size were investigated for energy loss, pressure loss coefficient, wall shear stress, and oscillatory shear index. During follow-up observation, 6 internal carotid posterior communicating artery and 7 middle cerebral artery aneurysms ruptured (44 and 43 remained unruptured, respectively, with the same location and a similar size as the ruptured cases).ResultsA significant difference in the minimum wall shear stress between aneurysms that ruptured and those that remained unruptured was noted only in internal carotid artery aneurysms (P<0.001). Energy loss showed a higher tendency in ruptured aneurysms but statistically not significant. For pressure loss coefficient, a significant difference was noted in both internal carotid artery (P=0.0046) and middle cerebral artery (P<0.001) aneurysms.ConclusionsPressure loss coefficient may be a potential parameter to predict future rupture of unruptured aneurysms.

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