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domperidone and cardiac SE

C M Villalón, M O den Boer, J P Heiligers, P R Saxena
1. It has recently been shown that the tachycardic response to 5-hydroxytryptamine (5-HT) in the anaesthetized pig, being mimicked by 5-methoxytryptamine and renzapride and blocked by high doses of ICS 205-930, is mediated by the putative 5-HT4 receptor. In the present investigation we have further characterized this receptor. 2. Intravenous bolus injections of the tryptamine derivatives, 5-HT (3, 10 and 30 micrograms kg-1), 5-methoxytryptamine (3, 10 and 30 micrograms kg-1) and alpha-methyl-5-hydroxytryptamine (alpha-methyl-5-HT; 3, 10, 30 and 100 micrograms kg-1), resulted in dose-dependent increases in heart rate of, respectively, 25 +/- 2, 48 +/- 3 and 68 +/- 3 beats min-1 (5-HT; n = 35); 15 +/- 1, 32 +/- 2 and 57 +/- 3 beats min-1 (5-methoxytryptamine; n = 30); 6 +/- 4, 18 +/- 6, 34 +/- 6 and 64 +/- 11 beats min-1 (alpha-methyl-5-HT; n = 3)...
January 1991: British Journal of Pharmacology
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