SotalolAmiodaroneAnti-Arrhythmia AgentsPropafenoneFlecainideAtrial FibrillationProcainamideArrhythmias, CardiacMexiletineQuinidineElectrocardiographyTachycardia, VentricularTachycardiaDisopyramideVentricular FibrillationBenzofuransRefractory Period, ElectrophysiologicalElectric CountershockAdrenergic beta-AntagonistsAtrial FlutterLidocaineHeart Conduction SystemBepridilTachycardia, SupraventricularPhenethylaminesHeart RateTorsades de PointesCardiac Pacing, ArtificialElectrocardiography, AmbulatoryDogsTocainideHeart AtriaElectrophysiologyCatheter AblationPyrimidinonesCardiac Complexes, PrematureAction PotentialsHeartAprindineRecurrenceDefibrillators, ImplantableDigoxinMagnesium HydroxideGuinea PigsTachycardia, ParoxysmalPropanolaminesAtrial Premature ComplexesTreatment OutcomeSodium Channel BlockersHeart VentriclesDose-Response Relationship, DrugMagnesium SulfateVerapamilBisoprololPulmonary VeinsMetoprololSulfonamidesPotassium Channel BlockersWolff-Parkinson-White SyndromeAdministration, OralTachycardia, Ectopic JunctionalDrug InteractionsEncainideAcetanilidesElectrophysiologic Techniques, CardiacFollow-Up StudiesSodium ChannelsAconitineLong QT SyndromePotassium ChannelsBradycardiaPropranololImidazolidinesDigitalis GlycosidesTime FactorsDouble-Blind MethodEther-A-Go-Go Potassium ChannelsAjmalineDeath, Sudden, CardiacMoricizinePapillary MusclesPiperidinesPurkinje FibersAtrial FunctionDigitalisVentricular Premature ComplexesAnisolesThyrotoxicosisMyocardiumAtenololDrug Therapy, CombinationAtrioventricular NodeCisaprideSinoatrial NodeMyocardial IschemiaInfusions, IntravenousProspective Studies