Abstract | OBJECTIVE: METHODS: Cold brain injury was induced for 1 minute in 140 rats. Treatment with OPC-21268, at dosages of 100 mg (n = 20), 200 mg (n = 20), and 300 mg/kg (n = 15), or with saline (n = 17) was started 1 hour after the induction of cold injury and was continued every 8 hours for 24 hours. Two percent Evans blue in saline (1 ml/kg) was administered intravenously before cold injury in another group of rats, 15 of which were saline-treated and 55 of which were OPC-21268-treated at the above dosages. After 24 hours, brain tissue water and electrolytes, brain tissue swelling, blood-brain barrier permeability to Evans blue, and plasma electrolytes and osmolality were determined. RESULTS: Compared with the saline-treated group, OPC-21268 treatment at the dosages of 200 and 300 mg/kg significantly reduced brain water content in both hemispheres (P<0.01). Swelling of the traumatized hemispheres was also significantly reduced at 200 and 300 mg/kg dosages (P<0.05). Brain tissue sodium content was significantly reduced at the dosage of 300 mg/kg (P<0.05). Blood-brain barrier permeability to Evans blue was significantly decreased in a dose-dependent manner compared with the saline-treated group (P<0.01). No significant changes were observed in other parameters. CONCLUSION: Our results indicate that OPC-21268 predominantly exerts a protective effect in areas where the maximum amount of blood-brain barrier breakdown occurs, and it is effective in the treatment of cold-induced vasogenic brain edema.
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Authors | I Bemana, S Nagao |
Journal | Neurosurgery
(Neurosurgery)
Vol. 44
Issue 1
Pg. 148-54; discussion 154-5
(Jan 1999)
ISSN: 0148-396X [Print] United States |
PMID | 9894975
(Publication Type: Journal Article)
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Chemical References |
- Antidiuretic Hormone Receptor Antagonists
- Piperidines
- Quinolones
- OPC 21268
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Topics |
- Administration, Oral
- Animals
- Antidiuretic Hormone Receptor Antagonists
- Blood-Brain Barrier
(drug effects)
- Brain Edema
(physiopathology)
- Dose-Response Relationship, Drug
- Male
- Piperidines
(pharmacology)
- Quinolones
(pharmacology)
- Rats
- Rats, Sprague-Dawley
- Water-Electrolyte Balance
(drug effects)
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