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Simulation Study on Parent Artery Occlusion Therapy for Basilar Head Giant Aneurysms : hemodynamic efficacy of additional bypass on enhancing aneurysmal thrombosis Shiro NAGASAWA 1 , Shinji KAWABATA 1 , Masahiro KAWANISHI 1 , Kazunobu YAMAGUCHI 1 , Yuichi TADA 1 , Tomio OHTA 1 1The Department of Neurosurgery, Osaka Medical College Keyword: aneurysm , basilar artery , occlusion therapy , simulation study , thrombosis pp.723-728
Published Date 1999/8/10
DOI https://doi.org/10.11477/mf.1436901762

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  • Abstract
  • Look Inside

Parent artery occlusion therapy has been used as an alternative for directly untreatable basilar headgiant aneurysms. However, some aneurysms still require additional technique to further induce intraaneu-rysmal stagnation and thrombosis.

Using a hydraulic model, half-life of the dye in the model aneurysm was measured as an index of the in-traaneurysmal stagnation. The ratio of diameters (D1, D2) of the two posterior communicating arteries(PCom) is defined as diameter ratio (DR) (D1/D2, Dl< D2). Occlusion therapy was simulated in 4 differ-ent sites. The most distal site was at the distal BA (Type A) and the most proximal site at the bilateralVA (Type D). The additional technique investigated was bypass placement to the P2 segment of the pos-terior cerebral artery (PCA) on the smaller PCom side.

The half-life was 2.5 ±0.2 (mean ± 2SD) sec before occlusion. Occlusion therapy significantly increasedthe half-life depending on the occlusion site and DR values with the maximum values of infinite in Type Aand 25 sec in Type D. Placement of the bypass decreased the tangential flow volume to the aneurysmalneck, and increased the time markedly in Types A and B, considerably in Type C and slightly in Type D. Parent artery occlusion therapy has been considered less beneficial for patiens with a diameter atio ofless than 0.70 since aneurysmal stagnation depends on the diameter ratio. Bypass placement additional tothe occlusion therapy is very useful in enhancing the aneurysmal stagnation, which would make those pa-tients indicated for the therapy.


Copyright © 1999, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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