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Translational Stroke Research
Published in: Translational Stroke Research 6/2015

01-12-2015 | Original Article

Characteristics of Cerebrovascular Injury in the Hyperacute Phase After Induced Severe Subarachnoid Hemorrhage

Authors: Yu Hasegawa, Hidenori Suzuki, Ken Uekawa, Takayuki Kawano, Shokei Kim-Mitsuyama

Published in: Translational Stroke Research | Issue 6/2015

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Abstract

Although there have been several investigations regarding acute brain injury after subarachnoid hemorrhage (SAH), the pathological conditions of severe SAH are unclear. In this study, we pursued the characteristics of cerebrovascular injury in the hyperacute phase after experimentally induced severe SAH. Twenty-three male Sprague-Dawley rats were subjected to sham or SAH operation using the endovascular perforation method and were evaluated for brain edema, blood-brain barrier (BBB) permeability, and arterial endothelial cell injury at 5 min after SAH (experiment 1). Next, animals were examined for functional and morphological changes of cerebral artery for 30 min after an acetazolamide injection administered 5 min after SAH (experiment 2). In experiment 1, while cerebral blood flow (CBF) was reduced, brain edema was not observed in SAH-operated rats. BBB permeability detected by immunoglobulin G extravasation was observed in the optic tract and was accompanied by the upregulation of phosphorylated extracellular signal-regulated kinase (ERK)-positive astrocytes. In addition, the number of phosphorylated ERK-positive endothelial cell in the distal middle cerebral artery (MCA) was significantly increased by SAH. In experiment 2, CBF in non-lethal SAH rats was reduced, and no response to acetazolamide was detected. Conversely, CBF in lethal SAH increased due to acetazolamide, although the value of CBF was low. Furthermore, there was significant narrowing of the MCA in SAH-operated rats. The findings suggest that the optic tract and the cerebral artery are the most vulnerable areas regarding cerebrovascular injury in a hyperacute phase after severe SAH and that they are associated with fatal outcomes.
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Metadata
Title
Characteristics of Cerebrovascular Injury in the Hyperacute Phase After Induced Severe Subarachnoid Hemorrhage
Authors
Yu Hasegawa
Hidenori Suzuki
Ken Uekawa
Takayuki Kawano
Shokei Kim-Mitsuyama
Publication date
01-12-2015
Publisher
Springer US
Published in
Translational Stroke Research / Issue 6/2015
Print ISSN: 1868-4483
Electronic ISSN: 1868-601X
DOI
https://doi.org/10.1007/s12975-015-0423-9

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