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• W2057995062 abstract "Quipazine (0.5-2 mg/kg i.v.) produced transient hypotension and bradycardia followed by sustained hypertension and variable effects on heart rate in anaesthetized rats. The hypotension, bradycardia and sympatho-inhibitory effects of quipazine were attenuated by bivagotomy. In bivagotomized rats, the hypertension produced by quipazine was not modified by hexamethonium or prazosin but was abolished by ritanserin (1 mg/kg i.v.). In ritanserin-treated rats, section of the carotid sinus nerves and vagus nerves or ICS 205.930 (0.1 mg/kg i.v.) abolished the hypotensive, bradycardic and sympatho-inhibitory effects of quipazine; the action of quipazine was not reproducible in these rats. Quipazine also inhibited the Bezold-Jarish reflex elicited by 5-HT (20 micrograms/kg i.v.). In ICS 205.930-treated rats, the hypertension evoked by quipazine was associated with a reduction in splanchnic nerve activity due to stimulation of baroreceptors. The renin-angiotensin system is not involved in the hypertensive response. The increase in heart rate produced by quipazine in bivagotomized rats was reduced by ritanserin and tertatolol (0.1 mg/kg i.v.) and abolished by a combination of both drugs. We conclude that the bradycardic and sympatho-inhibitory effects of quipazine result from activation of 5-HT3 receptors located in the cardiopulmonary area and of carotid body chemoreceptors. The hypertension and tachycardia are mediated by vascular and myocardial 5-HT2 receptors. No evidence was obtained for a central sympatho-excitatory effect." @default.
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• W2057995062 date "1990-08-01" @default.
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• W2057995062 title "The cardiovascular effects of quipazine are mediated by peripheral 5-HT2 and 5-HT3 receptors in anaesthetized rats" @default.
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• W2057995062 doi "https://doi.org/10.1016/0014-2999(90)90668-v" @default.
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