during chronic therapy ( 24 +/- 3 months ) with quinidine either alone or in combination with a second antiarrhythmic drug in the 38 patients whose arrhythmia had been suppressed during electrophysiologic testing , 32 ( 84 % ) remain symptom-free while 3 have had recurrent arrhythmia and 3 discontinued quinidine because of adverse effects .
C0003195
antiarrhythmic drug
C0034414
quinidine