May 1, 1993

Effects of pilsicainide on the atrial fibrillation threshold in guinea pig atria. A comparative study with disopyramide, lidocaine and flecainide

Japanese Heart Journal
M InoueM Nakagawa

Abstract

The effects of pilsicainide, a new class Ic antiarrhythmic agent, on the atrial fibrillation threshold (AFT), the atrial effective refractory period (ERP), and the interatrial conduction time (ACT) in Langendorff-perfused guinea pig hearts were investigated. These effects were compared with those of disopyramide, lidocaine and flecainide. Whole guinea pig heart was perfused with Tyrode's solution containing acetylcholine (3 x 10(-7) M). Three indices were measured before and after the administration of the test drugs using right atrial extrastimulus and high frequency stimulation. Pilsicainide, disopyramide and flecainide (> or = 10(-6) M) all significantly increased the AFT. Both pilsicainide and flecainide (> or = 3 x 10(-6) M) significantly prolonged the ERP, but this prolongation was less pronounced than that observed with disopyramide. The ACT was significantly prolonged with pilsicainide (> or = 10(-6) M), and this prolongation was greater than that observed with disopyramide but less than that with flecainide. Lidocaine had no effects on any of the indices measured. In conclusion, pilsicainide had a preventive effect on the atrial fibrillation induced by a combination of acetylcholine and high frequency stimulation in gu...Continue Reading

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Mentioned in this Paper

Disopyramide
Cavia
N-(2,6-dimethylphenyl)-8-pyrrolizidineacetamide hydrochloride
Disopyramide, L-Tartrate, (S)-isomer
Right Atrial Structure
Flecainide
Atrial Fibrillation
Cardiac Depressants
Refractory Period
Tyrode's solution

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