Wall shear stress distribution inside induced cerebral aneurysm on rabbit

T. Tanoue, S. Tateshima, D. Wakui, F. Vinuela, R. Sudo, K. Tanishita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Introduction: Cerebral aneurysm is a cerebrovascular disease resulting to subarachnoid hemorrhage. The generation, development and finally rupture of cerebral aneurysm could be related to hemodynamic stimulate, especially wall shear stress (WSS). WSS have been considered to play a role on the expression of such enzymes as iNOS, MMP-2 and MMP-9 leading to weakening of the arterial wall. However, detailed WSS distribution contributing to the enzyme expression has not been clarified inside cerebral artery. The purpose of our study is to clarify the WSS distribution corresponding to the enzyme expressions. Materials and Methods: We tried to induce cerebral aneurysm on rabbits, and created the realistic silicone model of the induced aneurysm. The flow field and WSS were measured using PIV (particle image velocimetry) and LDV (laser Doppler velocimeter) inside the realistic model. Furthermore, histological structure and enzyme expression were evaluated on the image of elastica van Gieson stain and on the immunostaining images. Results: Induced cerebral aneurysms were found in posterior circulation; the arterial bifurcation at basilar artery or posterior communicating artery. The induced cerebral aneurysm had an arterial wall structure with thinned media and lacked IEL. The thinned media was observed at the bulge top area wth low WSS distribution. On the other hand, lacked IEL was observed near the aneurysm neck area. Although WSS was not so low at the area of lacked IEL, the WSS spatial gradient appeared with high value at this area. The lack of occurs before the thinning of media on the process of aneurysm formation. In addition, MMP-2 and MMP-9 showed similar trend as the WSS spatial gradient. From these findings, high WSS gradient seems to have an effect on the early stage of cerebral aneurysm generation, stimulating the enzymes expression which leads to the destruction of the IEL.

Original languageEnglish
Title of host publicationIFMBE Proceedings
Pages1063-1066
Number of pages4
Volume31 IFMBE
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event6th World Congress of Biomechanics, WCB 2010 - In Conjunction with 14th International Conference on Biomedical Engineering, ICBME and 5th Asia Pacific Conference on Biomechanics, APBiomech - Singapore
Duration: 2010 Aug 12010 Aug 6

Other

Other6th World Congress of Biomechanics, WCB 2010 - In Conjunction with 14th International Conference on Biomedical Engineering, ICBME and 5th Asia Pacific Conference on Biomechanics, APBiomech
CitySingapore
Period10/8/110/8/6

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Keywords

  • cerebral aneurysm
  • hemodynamic
  • wall shear stress

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

Cite this

Tanoue, T., Tateshima, S., Wakui, D., Vinuela, F., Sudo, R., & Tanishita, K. (2010). Wall shear stress distribution inside induced cerebral aneurysm on rabbit. In IFMBE Proceedings (Vol. 31 IFMBE, pp. 1063-1066) https://doi.org/10.1007/978-3-642-14515-5_270