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- W1972239750 abstract "Experiments were done in order to assess the influence of low level lead poisoning in rats upon the responses of the rat cardiovascular system to perturbation by norepinephrine, epinephrine, and isoproterenol administration. Wistar rats were given lead acetate (50.0 mg/kg) via stomach tube once weekly for 5 weeks. Control rats were given sodium acetate similarly; both groups of rats were on a regular animal food diet during the experiment. At the end of the sixth week 2 types of responses were determined. Under urethane anesthesia, the response of mean arterial pressure and heart rate in control and lead-poisoned animals to various catecholamines was measured. Also the response of perfusion pressure in isolated mesenteric vessels, to catecholamines, was measured for vessels having been obtained from control and lead poisoned animals. Our results indicate that lead-treated rats, as compared to controls, have augmented and prolonged pressor responses to epinephrine and norepinephrine; less pronounced depression of arterial pressure in response to epinephrine and isoproterenol; and more pronounced tachycardia in response to isoproterenol. In the lead-treated rats, more pronounced vasoconstriction was observed in the perfusion studies upon administration of exogenous norepinephrine. Small doses of lead intensified alpha receptor response, diminished beta receptor response in blood vessels, and increased positive chronotropic action of isoproterenol." @default.
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- W1972239750 date "1986-06-01" @default.
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- W1972239750 title "Response of the cardiovascular system to catecholamines in rats given small doses of lead" @default.
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- W1972239750 doi "https://doi.org/10.1016/0300-483x(86)90028-4" @default.
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