Atrial FibrillationAtrial Function, LeftAtrial FunctionHeart AtriaAtrial Function, RightElectric CountershockCatheter AblationVentricular FibrillationAnti-Arrhythmia AgentsPulmonary VeinsEchocardiography, DopplerWarfarinAtrial FlutterAnticoagulantsElectrocardiographyElectrophysiologic Techniques, CardiacAtrial AppendageAmiodaroneEchocardiography, Doppler, PulsedCardiac Pacing, ArtificialEchocardiography, TransesophagealEchocardiographyPericardiectomyHeart Conduction SystemTreatment OutcomeMyocardial ContractionThromboembolismStrokeRefractory Period, ElectrophysiologicalTachycardia, ParoxysmalHeart Function TestsRecurrenceAtrial Premature ComplexesFollow-Up StudiesPropafenoneElectrocardiography, AmbulatoryVentricular Function, LeftStroke VolumeBody Surface Potential Mappingbeta-AlanineSotalolFlecainideRisk FactorsPacemaker, ArtificialProspective StudiesAtrioventricular NodeVentricular FunctionSick Sinus SyndromeTime FactorsInternational Normalized RatioEmbolismObserver VariationHeart RateCryosurgeryWolff-Parkinson-White SyndromeHemodynamicsBlood Flow VelocityArrhythmias, CardiacBepridilTachycardiaTachycardia, Ectopic AtrialDigoxinHemorrhageCardiac Surgical ProceduresChronic DiseaseDogsRisk AssessmentArrhythmia, SinusTachycardia, SupraventricularIncidenceRetrospective StudiesAtrial SeptumHeart FailureSinoatrial NodePredictive Value of TestsPostoperative ComplicationsHeart Valve DiseasesBradycardiaDefibrillators, ImplantableHeart DiseasesMitral ValveAspirinPericardiumProcainamideFibrinolytic AgentsAtrial RemodelingCerebrovascular DisordersElectrophysiologyPyridonesBenzimidazolesHeart BlockTachycardia, VentricularDisopyramideModels, CardiovascularChi-Square DistributionAdrenergic beta-AntagonistsComorbidityAction PotentialsMultivariate AnalysisAprindine