Atrial FibrillationAtrial FlutterElectric CountershockCatheter AblationAnti-Arrhythmia AgentsHeart AtriaPulmonary VeinsElectrophysiologic Techniques, CardiacAmiodaroneElectrocardiographyBepridilAtrial AppendageCardiac Pacing, ArtificialWarfarinAtrial Function, LeftHeart Conduction SystemAnticoagulantsSotalolChronic DiseaseRecurrenceAtrial FunctionPropafenoneTreatment OutcomeVentricular FibrillationFlecainideBody Surface Potential MappingFollow-Up StudiesAprindineThromboembolismRefractory Period, ElectrophysiologicalElectrocardiography, AmbulatoryCryosurgeryEchocardiography, TransesophagealTachycardia, ParoxysmalTime FactorsAtrioventricular NodeProspective StudiesHeart RateAtrial Premature ComplexesPacemaker, ArtificialDigoxinAtrial SeptumSick Sinus SyndromeProcainamideArrhythmia, SinusTricuspid ValveStrokeTachycardia, SupraventricularRisk FactorsAtrial Function, RightHeart Valve DiseasesTachycardiaHeart BlockRetrospective StudiesPericarditisMitral ValveSinoatrial NodeEmbolismPredictive Value of TestsArrhythmias, CardiacEchocardiographyHeart DiseasesTachycardia, Ectopic AtrialBundle of HisDogsCardiac Surgical ProceduresElectrophysiologyHeart FailureDisopyramidebeta-AlanineInternational Normalized RatioWolff-Parkinson-White SyndromeChi-Square DistributionEchocardiography, DopplerDouble-Blind MethodAction PotentialsIncidencePostoperative ComplicationsHemorrhageDefibrillators, ImplantableRisk AssessmentThrombosisMitral Valve StenosisCoronary SinusReoperationTachycardia, VentricularFluoroscopyVena Cava, InferiorCardiac CathetersHeart VentriclesCardiac CatheterizationBradycardiaSensitivity and SpecificityElectrodesEquipment DesignPericardiumAspirinHeart Valve Prosthesis ImplantationMultivariate AnalysisPremedication