oral administration of a 1.5-gm dose of n-acetylprocainamide ( napa ) to 9 patients with premature ventricular contractions ( pvcs ) confirmed previous indirect evidence that this metabolite of procainamide has antiarrhythmic efficacy and potency comparable to those of procainamide .
C0151636
premature ventricular contractions
C0033216
procainamide