Atrial FibrillationAtrial FlutterCatheter AblationHeart AtriaElectric CountershockAnti-Arrhythmia AgentsElectrocardiographyPulmonary VeinsCardiac Pacing, ArtificialElectrophysiologic Techniques, CardiacPropafenoneAtrial AppendageVentricular FibrillationAmiodaroneWarfarinAnticoagulantsChronic DiseaseHeart Conduction SystemAtrial FunctionRefractory Period, ElectrophysiologicalAtrial Function, LeftTachycardia, ParoxysmalTreatment OutcomeAtrioventricular NodeBody Surface Potential MappingRecurrenceElectrocardiography, AmbulatoryFollow-Up StudiesTricuspid ValveThromboembolismPacemaker, ArtificialSick Sinus SyndromeCryosurgeryAtrial Premature ComplexesFlecainideSotalolProcainamideDigoxinHeart BlockAtrial Function, RightEchocardiography, TransesophagealArrhythmia, SinusPericarditisStrokeTachycardia, SupraventricularProspective StudiesTime FactorsHeart Valve DiseasesTachycardiaHeart RateTachycardia, Ectopic AtrialRisk FactorsMitral ValveArrhythmias, CardiacDisopyramideBundle of HisDogsCardiac Surgical ProceduresEchocardiographyElectrophysiologyRetrospective StudiesHeart Diseasesbeta-AlanineEmbolismWolff-Parkinson-White SyndromeInternational Normalized RatioAtrial SeptumPostoperative ComplicationsHeart FailureVena Cava, InferiorPredictive Value of TestsCoronary SinusIncidenceAction PotentialsBepridilFluoroscopyRisk AssessmentSinoatrial NodeCardiac CathetersHemorrhageMitral Valve StenosisDefibrillators, ImplantableEchocardiography, DopplerBradycardiaHeart VentriclesTachycardia, VentricularThrombosisPericardiumCardiac CatheterizationSurgery, Computer-AssistedChi-Square DistributionEquipment DesignAspirinEndocardiumHeart Valve Prosthesis ImplantationAtrioventricular BlockHydrops FetalisMultivariate AnalysisTachycardia, Atrioventricular Nodal ReentryFibrinolytic Agents