Demonstration of alpha-adrenoceptor antagonism by the 5HT2 antagonist, ketanserin (R49945), in sheep.

Abstract:

:Serotonin causes a dose related (0.1-20 micrograms/kg i.v.) increase in mean arterial blood pressure (MAP) and heart rate in conscious sheep. Ketanserin (0.1 mg/kg per h i.v.) causes a decrease in blood pressure, and an increase in heart rate. In the presence of ketanserin, serotonin induced increases in MAP are attenuated, or abolished, but the increases in heart rate are enhanced. Ketanserin (10 mg/kg per h i.v.) attenuates or abolishes the increase in blood pressure induced by the alpha-adrenoceptor agonist phenylephrine in conscious sheep. When administered in the presence of the alpha-adrenoceptor antagonist prazosin, ketanserin (0.1 mg/kg per h i.v.) fails to induce a further hypotensive response. These data suggest that in the conscious sheep ketanserin exhibits predominantly alpha-adrenoceptor antagonism.

authors

Nelson MA,Coghlan JP,Denton DA,Mills EH,Spence CD,Whitworth JA,Scoggins BA

doi

10.1111/j.1440-1681.1984.tb00872.x

subject

Has Abstract

pub_date

1984-11-01 00:00:00

pages

597-604

issue

6

eissn

0305-1870

issn

1440-1681

journal_volume

11

pub_type

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