Effect of N-(4-Butoxybenzyl) Hyoscyaminium Bromide (Butropium Bromide) on the Isolated, Blood-perfused Canine Atrium Preparation
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The effects of butropium on chronotropic and isotropic activity were investigated in 10 isolated atrial preparations which were suspended in a bath and perfused with arterial blood led from a carotid artery of a heparinized support dog. Butropium injected into the cannulated sinus node artery in a dose range of 3 to 100μg produced a dose-dependent positive chronotropic and inotropic effect. At relatively higher doses above 30μg, slight and brief initial negative chronotropic and inotropic effect followed by a long-lasting positive effect was observed. The positive effect of butropium was markedly suppressed by propranolol or carteolol, but it was not affected by tetrodotoxin or desmethylimipramine.From these results, a large amount of butropium may induce positive chronotropic and inotropic effect through cholinergic blockade and in part stimulation of adrenergic beta-receptors.
- International Heart Journal刊行会の論文
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