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skos:definition |
MSH: An antianginal and antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting Na,K-activated myocardial adenosine triphosphatase. There is a resulting decrease in heart rate and in vascular resistance.,CSP: 2-butyl-3-(3,5-diiodo-4-beta diethylaminoethoxybenzoyl) benzofuran; coronary vasodilator used as an antiarrhythmic; severe risk of pulmonary and hepatic toxicity via disruption of lysosomal function; also has amphiphilic phototoxin properties.,NCI: An iodine-rich benzofuran derivative with antiarrhythmic and vasodilatory activities. As a class III antiarrhythmic agent, amiodarone blocks the myocardial calcium, potassium and sodium channels in cardiac tissue, resulting in prolongation of the cardiac action potential and refractory period. In addition, this agent inhibits alpha- and beta-adrenergic receptors, resulting in a reduction in sympathetic stimulation of the heart, a negative chronotropic effect, and a decrease in myocardial oxygen demands. Amiodarone m
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