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“This therapy may restore sinus rhythm, but conversion to sinus rhythm often requires the combined use of digitalis with a β-blocker or class I antiarrhythmic drug (quinidine, disopyramide, procainamide , propafenone, or flecainide).”
Journal of cardiovascular pharmacology • 1991 | View Paper
“Both diphenylhydantoin sodium and procaine amide can suppress digitalis arrhythmias due to enhanced automaticity, but procaine amide may promote “re-entry” arrhythmias by potentiating the intraventricular conduction defect caused by the glycoside.”
“In three experiments, the ventricular tachycardia induced by digitalis was changed by procainamide to a slower, multifocal ventricular rhythm with widened complexes.”