Journal article
ACTIONS OF SEROTONIN ANTAGONISTS ON DOG CORONARY-ARTERY
RM BRAZENOR, JA ANGUS
EUROPEAN JOURNAL OF PHARMACOLOGY | ELSEVIER SCIENCE BV | Published : 1982
Abstract
Serotonin released from platelets may initiate coronary vasospasm in patients with variant angina. If this hypothesis is correct, serotonin antagonists without constrictor activity may be useful in this form of angina. We have investigated drugs classified as serotonin antagonists on dog circumflex coronary artery ring segments in vitro. Ergotamine, dihydroergotamine, bromocriptine, lisuride, ergometrine, ketanserin, trazodone, cyproheptadine and pizotifen caused non-competitive antagonism of serotonin concentration-response curves. In addition, ketanserin, trazodone, bromocriptine and pizotifen inhibited noradrenaline responses in concentrations similar to those required for serotonin antag..
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