Atrial FibrillationCatheter AblationHeart AtriaVentricular FibrillationAnti-Arrhythmia AgentsPulmonary VeinsElectric CountershockWarfarinAtrial FlutterAnticoagulantsElectrocardiographyElectrophysiologic Techniques, CardiacAtrial AppendageAmiodaroneCardiac Pacing, ArtificialHeart Conduction SystemTreatment OutcomeThromboembolismStrokeRefractory Period, ElectrophysiologicalTachycardia, ParoxysmalAtrial Function, LeftAtrial FunctionRecurrenceAtrial Premature ComplexesFollow-Up StudiesPropafenoneElectrocardiography, AmbulatoryBody Surface Potential MappingRisk Factorsbeta-AlanineSotalolFlecainidePacemaker, ArtificialProspective StudiesTime FactorsAtrioventricular NodeSick Sinus SyndromeInternational Normalized RatioEmbolismEchocardiography, TransesophagealHeart RateCryosurgeryWolff-Parkinson-White SyndromeArrhythmias, CardiacBepridilTachycardiaTachycardia, Ectopic AtrialDigoxinHemorrhageCardiac Surgical ProceduresChronic DiseaseDogsRisk AssessmentAtrial Function, RightArrhythmia, SinusIncidenceTachycardia, SupraventricularEchocardiographyRetrospective StudiesAtrial SeptumHeart FailurePredictive Value of TestsSinoatrial NodePostoperative ComplicationsHeart Valve DiseasesMass SpectrometryHeart DiseasesBradycardiaMitral ValveDefibrillators, ImplantableAspirinPericardiumProcainamideFibrinolytic AgentsCerebrovascular DisordersAtrial RemodelingElectrophysiologyPyridonesBenzimidazolesHeart BlockChi-Square DistributionTachycardia, VentricularDisopyramideModels, CardiovascularComorbidityAdrenergic beta-AntagonistsAction PotentialsCohort StudiesMultivariate AnalysisAge FactorsAprindinePrognosisMitral Valve StenosisCoronary Artery BypassAutonomic DenervationVitamin KAdministration, OralCardiac Complexes, PrematureRheumatic Heart Disease