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. 1984 Jul;82(3):727–733. doi: 10.1111/j.1476-5381.1984.tb10812.x

Effects of five different organic calcium antagonists on guinea-pig isolated trachea.

C Advenier, J Cerrina, P Duroux, A Floch, A Renier
PMCID: PMC1987015  PMID: 6611187

Abstract

The relaxant effects of five organic calcium antagonists (nicardipine, diltiazem, PY 108068, verapamil and bepridil) on guinea-pig isolated trachea were tested against contractions induced by acetylcholine, histamine, 5-hydroxytryptamine, potassium chloride (KCl) and tetraethylammonium (TEA) in a medium containing the normal amount of calcium and against calcium dose-response curves in a calcium-free, potassium-enriched medium. These effects were compared with those of spasmolytic or specific acetylcholine or histamine antagonists. In contrast to the other drugs tested, organic calcium antagonists exerted a specific inhibitory effect on KCl- and TEA-induced contractions. Their degree of activity was in the order: nicardipine greater than diltiazem greater than PY 108068 greater than verapamil greater than bepridil. All calcium antagonists inhibited calcium dose-response curves at similar concentrations. Organic calcium antagonists therefore seem to exert a specific inhibitory effect on depolarizing agents in the guinea-pig isolated trachea, unlike other tissues, notably some vascular smooth muscles.

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Selected References

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