The Role of Anastomoses in Brain Circulation
In the last three years a suitable computer model of the brain circulation has been developed1, for the study in detail of the significance and the efficiency of the natural and arteficial anastomoses in the brain vessel network.
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Neurosurgical Department of Comenius University, Bratislava, Czechoslovakia
The Role of Anastomoses in Brain Circulation Study of Computer Model P. Nadvornik and J. Duros With 1 Figure
In the last three years a suitable computer model of the brain circulation has been developed 1, for the study in detail of the significance and the efficiency of the natural and arteficial anastomoses in the brain vessel network. Method and Results One of our special interests is the change in regional CBF with various occlusions of the main brain arteries combined with some background factors, such as occlusive lesions of the communicating arteries of the Circle of Willis (CW), small vessel disease, and artificial extra-intracranial microanastomosis. With the computer model, the normal configuration of the brain vessel network was simulated, and the following occlusions of afferent supply vessels to the CW were considered: 1. bilateral internal carotid artery (ICA) occlusion with or without unilateral vertebral artery occlusion; 2. unilateral ICA occlusion with or without bilateral or unilateral vertebral artery occlusion, and 3. bilateral or unilateral vertebral artery occlusion. An additional occlusion of one of the communicating arteries of CW, namely the posterior communicating cerebral artery on the side of the main supply vessel occlusion, or the anterior communicating cerebral artery, has been imposed. Complete occlusion of the main supply vessel has resulted in a decrease of CBF of less than 20% even in the most complicated case of bilateral ICA and unilateral vertebral artery occlusion. This value has been raised to 33 % in the affected hemisphere and to 24 % in the contralateral hemisphere with a combined occlusion of one posterior communicating cerebral artery.
P . Nadvornik et al.: The Role of Anastomoses in Brain Circulation
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