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  • 1
    ISSN: 0942-0940
    Keywords: Cerebral infarction ; brain swelling ; mannitol ; glycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using our previously published “incomplete cerebral hemispheric infarction model in dogs” (produced by simultaneous ipsilateral occlusions of the anterior cerebral artery at the branching of the ethmoidal artery from its A1 portion, the A2 portion, the internal carotid artery, the posterior communicating artery, the posterior cerebral artery, and the anterior cerebellar artery), two, four, or six hours occlusion of blood flow was undertaken. Observations were then made on the degree of brain swelling following recirculation due to administration of mannitol or glycerol solutions. Furthermore, the leakage of Evans blue was investigated to determine the damage to the blood brain barrier. 1. In the animals given mannitol or glycerol, brain swelling was suppressed, following two hours occlusion. In the animals given mannitol, however, brain swelling was not suppressed after four or six hours occlusion. 2. After two hours occlusion in the animals given mannitol, leakage of Evans blue was slight compared with the untreated group. In the six hours occlusion groups, severe leakage of Evans blue was seen in both the untreated animals and the mannitol-treated animals. After two hours occlusion, in some animals which had been given glycerol, severe leakage of Evans blue was seen, even when there was little brain swelling.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0942-0940
    Keywords: Cerebral ischaemia ; mannitol ; fluorocarbon emulsion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using the “canine model of complete ischemic brain regulated with a perfusion method” in which it is possible to control the degree of blood flow to a cerebral hemisphere via a perfusion pump, the effects of mannitol (which acts as a free radical scavenger) and fluorcarbon emulsion (FC) (which has 0.1 μm of average particle size and a high oxygen-carrying capacity) on cerebral ischaemia were investigated. After pretreatment with the drugs, blood flow was reduced via the pump to 1/10 the normal state and 1 hour later, return to a normal state allowed. Subsequent changes in electrical activity were observed and the effects of the drugs evaluated. In the control group, no recovery of electrical activity was seen, but in the animals treated with either mannitol or FC, incomplete, yet distinct recovery was apparent. In the animals administered mannitol together with FC, however, marked recovery was evident. These experimental results indicate that the combined administration of mannitol and FC is effective in protecting the brain from cerebral ischaemia.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 58 (1981), S. 149-160 
    ISSN: 0942-0940
    Keywords: Brain swelling ; mannitol ; perfluorochemicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using the incomplete cerebral hemisphere infarction in dogs, we have been able to produce brain swelling in all animals after six hours of vascular occlusion followed by recirculation of blood. The current study tested the effects of mannitol, perfluorochemicals (FC), and inhalation of oxygen in various combinations on such brain swelling. 1. Mannitol alone, FC alone, and FC together with oxygen were ineffective. Mannitol together with oxygen was to some extent effective in suppressing brain swelling. 2. Mannitol followed by FC was effective in suppressing brain swelling, and this effectiveness was further enhanced by inhalation of oxygen. 3. Noteworthy is the fact that among these experimental groups, there were animals in which brain swelling was severe, yet extravasation of Evans blue was slight and, contrarily, animals in which brain swelling was slight but extravasation severe.
    Type of Medium: Electronic Resource
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