in 30 patients , the addition of propafenone resulted in a significant reduction of premature ventricular contraction ( pvc ) frequency compared to drug-free baseline ( 406 pvc/hr vs 33 , p less than 0.001 ) and to procainamide or quinidine monotherapy ( 211 pvc/hr vs 27 , p less than 0.01 ) .
C0033429
propafenone
C0034414
quinidine