since however l has well defined electrophysiologic properties ( class 1 b ) and does not seem to be effective in all of these patients we compared its antiarrhythmic efficacy with the one of amiodarone ( a ) , an antiarrhythmic agent provided of electrophysiologic properties quite different from l ( class 4 ) and usually well tolerated .
C0002598
amiodarone
C0003195
antiarrhythmic agent