isoprenaline ( 5 x 10 ( -7 ) m ) and adrenaline ( 10 ( -6 ) m ) restored spontaneous firing of preparations arrested by any of the antiarrhythmic agents and repolarized ventricular cells depolarized by procaine , procainamide or quinidine .
C0003195
antiarrhythmic agents
C0033216
procainamide