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Stroke, Vol 21, 582-588, Copyright © 1990 by American Heart Association

ARTICLES

Brain edema and cerebrovascular permeability during cerebral ischemia in rats

S Hatashita and JT Hoff
Section of Neurosurgery, University of Michigan, Ann Arbor.

Focal cerebral ischemia was produced by occluding the left middle cerebral artery in 769 rats. Permeability of the blood-brain barrier to small or large molecules was evaluated qualitatively using Evans blue or sodium fluorescein and quantitatively using the transfer indexes of iodine-125-labeled bovine serum albumin or [14C]sucrose. Water content was determined using wet and dry weights and sodium and potassium contents using flame photometry. Cortical tissue in the middle cerebral artery territory was sampled less than or equal to 14 days after occlusion. A significant increase in the albumin transfer index was first found 12 hours after occlusion, and the index remained approximately the same until water content peaked 3 days after occlusion. In contrast, the sucrose transfer index increased gradually, significantly correlated with increases in the water and sodium contents. Tissue staining by sodium fluorescein was more extensive than that by Evans blue. As edema fluid decreased gradually 4-10 days after occlusion, the albumin and sucrose transfer indexes increased markedly. These findings indicate that disruption of the blood-brain barrier to small molecules is accompanied by accumulation of edema fluid during the later stages of ischemia. Opening of the barrier to serum protein is probably related to the resolution of edema.

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