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KMID : 1001920070420040337
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Journal of Korean Neurosurgical Society
2007 Volume.42 No. 4 p.337 ~ p.341
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Accumulated Mannitol and Aggravated Cerebral Edema in a Rat Model of Middle Cerebral Artery Infarction
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Cho Jae-Man
Han Hyung-Soo
Kim Yeon-Hee
Park Jae-Chan
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Abstract
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Objective: Repeated administration of mannitol in the setting of large hemispheric infarction is a controversial and poorly defined therapeutic intervention. This study was performed to examine the effects of multiple-dose mannitol on a brain edema after large hemispheric infarction.
Methods: A middle cerebral artery was occluded with the rat suture model for 6 hours and reperfused in 22 rats. The rats were randomly assigned to either control (n=10) or the mannitol-treated group (n=12) in which intravenous mannitol infusions (0.8 g/kg) were performed six times every four hours. After staining a brain slice with 2,3,5-triphenyltetrazolium chloride, the weight of hemispheres, infarcted (IH) and contralateral (CH), and the IH/CH weight ratio were examined, and then hemispheric accumulation of mannitol was photometrically evaluated based on formation of NADH catalyzed by mannitol dehydrogenase.
Results: Mannitol administration produced changes in body weight of -7.6±1.1%, increased plasma osmolality to 312±8 mOsm/L. It remarkably increased weight of IH (0.77±0.06 gm versus 0.68±0.03 gm : p＜0.01) and the IH/CH weight ratio (1.23±0.07 versus 1.12±0.05 : p＜0.01). The photometric absorption at 340 nm of the cerebral tissue in the mannitol-treated group was increased to 0.375±0.071 and 0.239±0.051 in the IH and CH, respectively from 0.167±0.082 and 0.162±0.091 in the IH and CH of the control group (p＜0.01).
Conclusion: Multiple-dose mannitol is likely to aggravate cerebral edema due to parenchymal accumulation of mannitol in the infarcted brain tissue.
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KEYWORD
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Brain edema, Cerebral infarction, Mannitol, Mannitol dehydrogenase, Rat, Middle cerebral artery
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