Summary
Acute exposure of mice to hypobaric hypoxia, or reduced oxygen at normal pressure, markedly potentiated barbiturate-induced hypnosis. The mice showed lower body concentration of pentobarbital on awakening and reduced rate of pentobarbital disappearance from the body during exposure to the hypoxic environment. These data suggest that acute exposure to hypoxia depresses in vivo metabolism of pentobarbital and enhances CNS sensitivity to the barbiturates.
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Aldridge, W. N.: Action of barbiturates upon respiratory enzymes. In: Enzymes and Drug Action (CIBA Foundation Symposium), Mongar, J. and A. de Reuck (ed.). 155–169. Boston: Little, Brown and Comp. 1962.
Baumel, I., DeFeo, J., Lal, H.: Differential effect of hypobaric hypoxia on potency of CNS depressants in rats and mice. Proc. Soc. exp. Biol. (N.Y.) 132, 629–631 (1969).
—, Robinson, S. M., Blatt, W. F.: Multi-chamber system for toxicity studies in mice at simulated high altitude. J. Pharm. Sci. 56, 918–919 (1967).
—, Schatz, R., DeFeo, J., Lal, H.: Protection against semicarbazide-induced convulsions in mice at hypobaric pressure. J. Pharm. Pharmacol. 21, 119–120 (1969a).
— — — —: Protection against m-fluorotyrosine convulsions and lethality in mice exposed to hypobaric hypoxia. J. Pharm. Pharmacol. 21, 475–476 (1969b).
— — — —: Hypoxia and methionine sulphoximine seizures in mice. J. Pharm. Pharmacol. 21, 703–704 (1969c).
Bennett, M., Aljure, E., Narajima, Y., Pappas, G. D.: Electronic junctions between teleost spinal neurons: electrophysiology and ultrastructure. Science 141, 262–264 (1963).
Cooper, J. R., Brodie, B. B.: Enzymatic oxidation of pentobarbital and thiopental. J. Pharmacol. exp. Ther. 120, 75–83 (1957).
Dorfman, A., Goldbaum, L. R.: Detoxification of barbiturates. J. Pharmacol. exp. Ther. 90, 330–337 (1947).
Ebert, A. G., Yim, G. K., Miya, T. S.: Distribution and metabolism of barbital-C14 in tolerant and non-tolerant rats. Biochem. Pharmacol. 13, 1267–1274 (1964).
Monge, C.: Aclimatacion en los andes. Lima: Facultad de Medicina 1960.
Mustala, O., Azarnoff, D. L.: Effect of oxygen tension on drug levels and pharmacologic action in the intact animal. Proc. Soc. exp. Biol. (N.Y.) 132, 37–41 (1969).
Oja, S., Oja, H., Sarajas, H.: Cerebral free amino acids in rats undergoing varying periods of anesthesia and hypothermia. Ann. Acad. Sci. fenn. 142, 3–14 (1968).
Robinson, S. M., Baumel, I., Blatt, W. F.: The effect of simulated altitude exposure on the lethality of sympathomimetic amines. Toxicol. appl. Pharmacol. 15, 304–309 (1969).
Snedecor, G. W., Cochran, W. G.: Statistical methods. Ames, Iowa: Iowa State College Press 1957.
Stickney, J. C.: Effect of anoxia on body weight loss in rats. Proc. Soc. exp. Biol. (N.Y.) 63, 210–212 (1946).
Wood, J.D., Watson, W.J., Ducker, A.J.: The effect of hypoxia on brain gammaaminobutyric acid levels. J. Neurochem. 15, 603–608 (1968).
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Baumel, I., DeFeo, J.J. & Lal, H. Effect of acute hypoxia on brain-sensitivity and metabolism of barbiturates in mice. Psychopharmacologia 17, 193–197 (1970). https://doi.org/10.1007/BF00402709
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DOI: https://doi.org/10.1007/BF00402709