Atrial FibrillationHeart AtriaElectric CountershockCatheter AblationChronic DiseaseAnti-Arrhythmia AgentsPulmonary VeinsAtrial AppendageWarfarinElectrocardiographyCardiac Pacing, ArtificialAtrial FlutterAnticoagulantsVentricular FibrillationAmiodaroneAtrial Function, LeftPropafenoneAtrial FunctionHeart Conduction SystemRefractory Period, ElectrophysiologicalElectrophysiologic Techniques, CardiacAtrioventricular NodeHeart Valve DiseasesPacemaker, ArtificialDigoxinTachycardia, ParoxysmalTreatment OutcomeSotalolThromboembolismElectrocardiography, AmbulatorySick Sinus SyndromeArrhythmia, SinusRecurrenceCryosurgeryMitral ValveFollow-Up StudiesStrokeEchocardiography, TransesophagealHeart RateBundle of HisTime FactorsProspective StudiesRisk FactorsAtrial Premature ComplexesCardiac Surgical ProceduresEchocardiographyBody Surface Potential MappingRetrospective Studiesbeta-AlanineHeart FailureFlecainideMitral Valve StenosisDogsHeart DiseasesInternational Normalized RatioAction PotentialsEmbolismElectrophysiologyPredictive Value of TestsThrombosisWolff-Parkinson-White SyndromeHeart Valve Prosthesis ImplantationEchocardiography, DopplerArrhythmias, CardiacHeart VentriclesBepridilTachycardiaTachycardia, Ectopic AtrialHemorrhageAtrial Function, RightRisk AssessmentMitral Valve InsufficiencyTachycardia, SupraventricularIncidenceAtrial SeptumSinoatrial NodePostoperative ComplicationsMyocardial ContractionBradycardiaDefibrillators, ImplantableMyocytes, CardiacAspirinMyocardiumPericardiumExercise TestProcainamideCombined Modality TherapySwedenFibrinolytic AgentsAtrial RemodelingCerebrovascular DisordersPyridonesBenzimidazolesHeart BlockTachycardia, VentricularDisopyramideModels, CardiovascularChi-Square DistributionAdrenergic beta-AntagonistsComorbidity