plasma levels of procainamide ( pa ) required to protect against recurrent vt averaged 9.4 +/- 3.4 microgram ml , compared with mean levels of 14.9 +/- 3.8 microgram/ml for 85 % suppression of pvcs ( p less than 0.01 ) .
C0033216
procainamide
C0151636
pvcs