three patients are described in whom malignant ventricular arrhythmias appeared in connection with a reinfarction some days after hospitalization for an acute myocardial infarction and in whom massive doses of procainamide , up to 7.5 g/day i.v. , were necessary to prevent these arrhythmias .
C0085612
ventricular arrhythmias
C0003811
arrhythmias