Different Effects of Class Ic and III Antiarrhythmic Drugs on Vagotonic Atrial Fibrillation in the Canine Heart

Abstract
Effects of class Ic drug pilsicainide and class III drug MS-551 were determined in the canine model of atrial fibrillation (AF) induced under vagal stimulation. Pilsicainide injected intravenously at a dose of 1.0 mg/kg over 3 min terminated AF in six of six dogs. After pilsicainide injection, the effective refractory period (ERP) of the right atrium (RA) increased (104 ± 22 to 122 ± 31 ms; p

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