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- W2118088691 abstract "Since alpha 2-adrenergic agonists have important effects on the adrenergic system that have recently been applied to the anesthetic setting, we investigated the effect of stimulation of alpha 2 adrenoceptors on epinephrine-induced arrhythmias in halothane-anesthetized dogs. The arrhythmogenic threshold for epinephrine was determined during halothane anesthesia in the presence of dexmedetomidine, a selective alpha 2 agonist, and L-medetomidine, a stereoisomer of medetomidine that lacks alpha 2-agonist activity. Dexmedetomidine increased the arrhythmogenic threshold for epinephrine in a dose-dependent manner during halothane anesthesia. At the highest dose of dexmedetomidine, 0.5 microgram.kg-1.min-1, there was a three-fold increase in both the arrhythmogenic dose of epinephrine and the plasma epinephrine concentration that was reached at this dose. On the other hand, L-medetomidine over the same dose range did not effect the arrhythmogenic dose of epinephrine. Atipamezole, a central alpha 2 antagonist that crossed the blood-brain barrier, blocked the antiarrhythmic action of dexmedetomidine. L-659,066 a peripheral alpha 2 antagonist that does not penetrate the blood-brain barrier, did not affect the antiarrhythmic action of dexmedetomidine. Thus, dexmedetomidine's antiarrhythmic effect on epinephrine-induced arrhythmias during halothane anesthesia appears to be mediated at least in part by stimulation of central alpha 2 adrenoceptors." @default.
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- W2118088691 date "1991-07-01" @default.
- W2118088691 modified "2023-10-17" @default.
- W2118088691 title "Dexmedetomidine Prevents Epinephrine-induced Arrhythmias Through Stimulation of Central α2 Adrenoceptors in Halothane-anesthetized Dogs" @default.
- W2118088691 doi "https://doi.org/10.1097/00000542-199107000-00018" @default.
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