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- W2012083046 abstract "Previously, we demonstrated that dexmedetomidine, an alpha 2 agonist, produces a hypnotic-anesthetic response in rats via activation of central alpha 2 adrenoceptors and that this response could be enhanced by the alpha 1 antagonist prazosin. In the current experiment we investigated whether central alpha 1 adrenoceptor stimulation antagonizes the alpha 2 adrenoceptor-mediated hypnotic response. Cirazoline, an alpha 1 adrenoceptor agonist that partitions into the central nervous system, attenuated dexmedetomidine's hypnotic response whether administered systemically (0.3-1 mg.kg-1 intraperitoneally [ip]) or centrally (0.1 mg.kg-1 intracerebroventricularly). Prazosin, an alpha 1 adrenoceptor antagonist that effectively crosses the blood-brain barrier, fully blocked cirazoline's attenuating effect on dexmedetomidine-induced hypnosis, whereas doxazosin, which partitions poorly into the brain, did not block cirazoline's effect. Administration of phenylephrine, 0.3-3 mg.kg-1 ip, an alpha 1 adrenoceptor agonist that does not penetrate into the brain, did not attenuate dexmedetomidine's hypnotic effect. These results indicate that central alpha 1-adrenoceptor stimulation functionally antagonizes the hypnotic response to an alpha 2-adrenoceptor agonist. These data underscore the important requirement for alpha 2 adrenoceptor selectivity if these agonists are to be useful in the anesthetic setting." @default.
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- W2012083046 date "1991-08-01" @default.
- W2012083046 modified "2023-10-04" @default.
- W2012083046 title "Central α1-Adrenoceptor Stimulation Functionally Antagonizes the Hypnotic Response to Dexmedetomidine, an α2-Adrenoceptor Agonist" @default.
- W2012083046 doi "https://doi.org/10.1097/00000542-199108000-00013" @default.
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