title: Cardiovascular studies with impromidine (SK&F 92676), a new very potent and specific histamine H2-receptor agonist.
abstract: Impromidine (SK & F 92676) has recently been identified as a potent and specific histamine H2-receptor agonist. The present paper describes some cardiovascular studies with the drug. Impromidine lowers blood pressure in cats and rats by interaction with H2-receptors. During continuous intravenous infusions of impromidine, the fall in blood pressure is due to a reduction in total peripheral resistance; cardiac output increases during hypotension. The responses to impromidine are similar to responses to histamine in mepyramine-treated cats. Impromidine administered intra-arterially also causes vasodilatation in the femoral and mesenteric vasculature by interaction with H2-receptors. Impromidine stimulates all measured parameters including coronary flow in the isolated working heart of the guinea-pig. Dose-response curves to impromidine were displaced to the right in the presence of cimetidine.
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002415:Cats; D002927:Cimetidine / Q000494:pharmacology; D005260:Female; D006146:Guanidines / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects*; D007093:Imidazoles / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D066298:In Vitro Techniques; D008297:Male; D051381:Rats; D011968:Receptors, Histamine / Q000187:drug effects*; D011970:Receptors, Histamine H2 / Q000187:drug effects*; D014665:Vasodilator Agents
chemical_list: D006146:Guanidines; D007093:Imidazoles; D011968:Receptors, Histamine; D011970:Receptors, Histamine H2; D014665:Vasodilator Agents; D002927:Cimetidine