Atrial FibrillationAspirinCatheter AblationHeart AtriaVentricular FibrillationAnti-Arrhythmia AgentsPulmonary VeinsElectric CountershockWarfarinAnticoagulantsAtrial FlutterElectrocardiographyElectrophysiologic Techniques, CardiacAtrial AppendageAmiodaroneCardiac Pacing, ArtificialHeart Conduction SystemTreatment OutcomeThromboembolismStrokeRefractory Period, ElectrophysiologicalTachycardia, ParoxysmalAtrial FunctionAtrial Function, LeftRecurrenceFollow-Up StudiesAtrial Premature ComplexesPropafenoneElectrocardiography, AmbulatoryRisk FactorsBody Surface Potential MappingProspective Studiesbeta-AlanineSotalolFlecainideTime FactorsPacemaker, ArtificialPlatelet Aggregation InhibitorsInternational Normalized RatioAtrioventricular NodeEmbolismSick Sinus SyndromeEchocardiography, TransesophagealHemorrhageHeart RateCryosurgeryWolff-Parkinson-White SyndromeArrhythmias, CardiacBepridilRisk AssessmentTachycardiaIncidenceTachycardia, Ectopic AtrialChronic DiseaseDogsDigoxinCardiac Surgical ProceduresAtrial Function, RightRetrospective StudiesArrhythmia, SinusTachycardia, SupraventricularFibrinolytic AgentsEchocardiographyHeart FailureAtrial SeptumPostoperative ComplicationsSinoatrial NodePredictive Value of TestsHeart DiseasesHeart Valve DiseasesBradycardiaDefibrillators, ImplantableMitral ValveAnti-Inflammatory Agents, Non-SteroidalCerebrovascular DisordersPericardiumProcainamideThrombosisPyridonesAtrial RemodelingChi-Square DistributionBenzimidazolesAdrenergic beta-AntagonistsElectrophysiologyCohort StudiesMultivariate AnalysisComorbidityHeart BlockTachycardia, VentricularModels, CardiovascularDisopyramideAdministration, OralDouble-Blind MethodCoronary Artery BypassAction PotentialsPrognosisAge FactorsVitamin KAprindineProportional Hazards Models