alternate antiarrhythmic agents used in this study were digoxin ( n = 25 ) , propranolol ( n = 21 ) , verapamil ( n = 10 ) , metoprolol ( n = 11 ) , quinidine ( n = 2 ) , and a combination of two antiarrhythmic agents ( n = 7 ) .
C0034414
quinidine
C0003195
antiarrhythmic