BACKGROUND AND PURPOSE: The role of blood-flow biomechanics on the size, morphology, and growth of cerebral aneurysms is poorly known. The purpose of this study was to evaluate intra-aneurysmal hemodynamics before and after aneurysm growth. MATERIALS AND METHODS: A flow-simulation study was performed in a middle cerebral artery (MCA) aneurysm with a bleb that grew after 1-year follow-up. Geometrically realistic in vitro models before and after aneurysm growth were constructed on the basis of CT angiograms. Blood-flow velocity, vorticity, and wall shear stress were obtained by using particle imaging velocimetry and laser Doppler velocimetry. RESULTS: No significant quantitative differences were noted among the overall flow structures before and after aneurysm growth, with the exception of less vorticity in the bleb after aneurysm growth. A circulating flow pattern was seen within the aneurysm domes. A blood-flow separation was observed at the margins of the bleb. No impingement of inward flow into the enlarging bleb was noted. Before the aneurysm growth, the wall shear stress was high at the aneurysm neck and also at the margin of the bleb. The value of wall shear stress decreased in the deeper part of the bleb. This value decreased even more after the aneurysm growth. CONCLUSIONS: Intra-aneurysmal hemodynamic structures before and after the growth of an MCA aneurysm were compared. Further investigation with a similar approach is mandatory to obtain a firm conclusion.
BACKGROUND AND PURPOSE: The role of blood-flow biomechanics on the size, morphology, and growth of cerebral aneurysms is poorly known. The purpose of this study was to evaluate intra-aneurysmal hemodynamics before and after aneurysm growth. MATERIALS AND METHODS: A flow-simulation study was performed in a middle cerebral artery (MCA) aneurysm with a bleb that grew after 1-year follow-up. Geometrically realistic in vitro models before and after aneurysm growth were constructed on the basis of CT angiograms. Blood-flow velocity, vorticity, and wall shear stress were obtained by using particle imaging velocimetry and laser Doppler velocimetry. RESULTS: No significant quantitative differences were noted among the overall flow structures before and after aneurysm growth, with the exception of less vorticity in the bleb after aneurysm growth. A circulating flow pattern was seen within the aneurysm domes. A blood-flow separation was observed at the margins of the bleb. No impingement of inward flow into the enlarging bleb was noted. Before the aneurysm growth, the wall shear stress was high at the aneurysm neck and also at the margin of the bleb. The value of wall shear stress decreased in the deeper part of the bleb. This value decreased even more after the aneurysm growth. CONCLUSIONS:Intra-aneurysmal hemodynamic structures before and after the growth of an MCA aneurysm were compared. Further investigation with a similar approach is mandatory to obtain a firm conclusion.
Authors: S Fukuda; N Hashimoto; H Naritomi; I Nagata; K Nozaki; S Kondo; M Kurino; H Kikuchi Journal: Circulation Date: 2000-05-30 Impact factor: 29.690
Authors: H Ujiie; H Tachibana; O Hiramatsu; A L Hazel; T Matsumoto; Y Ogasawara; H Nakajima; T Hori; K Takakura; F Kajiya Journal: Neurosurgery Date: 1999-07 Impact factor: 4.654
Authors: Liang-Der Jou; Christopher M Quick; William L Young; Michael T Lawton; Randall Higashida; Alastair Martin; David Saloner Journal: AJNR Am J Neuroradiol Date: 2003-10 Impact factor: 3.825
Authors: Marcelo Raschi; Fernando Mut; Greg Byrne; Christopher M Putman; Satoshi Tateshima; Fernando Viñuela; Tetsuya Tanoue; Kazuo Tanishita; Juan R Cebral Journal: Int J Numer Method Biomed Eng Date: 2012-02 Impact factor: 2.747
Authors: V L Rayz; L Boussel; M T Lawton; G Acevedo-Bolton; L Ge; W L Young; R T Higashida; D Saloner Journal: Ann Biomed Eng Date: 2008-09-12 Impact factor: 3.934
Authors: Aichi Chien; Satoshi Tateshima; Marcelo Castro; James Sayre; Juan Cebral; Fernando Viñuela Journal: Med Biol Eng Comput Date: 2008-10-18 Impact factor: 2.602