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The effect of anatomic variations of circle of Willis on cerebral blood distribution during posture change from supination to standing: A model study

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 3rd International Conference on Biomedical Engineering and Biotechnology, 25–28 September 2014, Beijing, China

Article type: Research Article

Authors: Zhang, Chi | Li, Shuyu | Pu, Fang; | Fan, Yubo; | Li, Deyu; ;

Affiliations: Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China | State Key Lab of Virtual Reality of Technology and Systems, Beihang University, Beijing 100191, China

Note: [] Corresponding author: Deyu LI, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China. Tel.: +8 610 82339093; Fax: +8 610 82339093; E-mail: [email protected].

Keywords: Circle of Willis, internal carotid artery stenosis, anatomic variation, lumped parameter model, posture change

DOI: 10.3233/BME-141050

Journal: Bio-Medical Materials and Engineering, vol. 24, no. 6, pp. 2371-2380, 2014

Published: 2014
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Abstract

The anatomic variation of Circle of Willis (CoW) has great impact on its compensatory capacity during stroke and cerebral ischemia. In the present study, a series of lumped parameter models were developed and used to simulate the effect of postural changes on the cerebral blood flow in ICA stenosis patients with different anatomic variants of the CoW. The results showed that the asymmetric distribution of cerebral blood flow caused by stenosis was attenuated in standing position in complete and half-complete CoW. However, in incomplete CoW, the decrease in blood flow in the ipsilateral cerebral arteries caused by unilateral ICA stenosis was dramatic in both supine and standing positions, a likely result of inadequate collateral circulation within the CoW. In conclusion, the anatomic variation of CoW plays a significant role in maintaining the balance of cerebral blood supply in patients with ICA stenosis, especially during postural change.

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