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The effects of the new and potent methanesulfonanilide class III antiarrhythmic agents (E-4031, UK-66,914, and UK-68,798) on myocardial refractoriness and contractility were compared to those of d-sotalol in ferret isometrically contracting right ventricular papillary muscle preparations. During 1 Hz pacing at 37 degrees C, the four class III agents(More)
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