Atrial FibrillationCardiac OutputHemodynamicsCatheter AblationHeart AtriaVentricular FibrillationAnti-Arrhythmia AgentsPulmonary VeinsElectric CountershockExercise TestElectrocardiographyWarfarinAtrial FlutterAnticoagulantsCardiac Pacing, ArtificialElectrophysiologic Techniques, CardiacExercise TherapyAtrial AppendageAmiodaroneHeart Conduction SystemExerciseTreatment OutcomeExercise ToleranceHeart RateArrhythmias, CardiacTime FactorsThromboembolismFollow-Up StudiesStrokeAtrial FunctionMyocytes, CardiacRefractory Period, ElectrophysiologicalAtrial Function, LeftTachycardia, ParoxysmalCardiac Surgical ProceduresRecurrenceElectrocardiography, AmbulatoryRisk FactorsAtrial Premature ComplexesProspective StudiesPropafenonePacemaker, ArtificialBody Surface Potential MappingPhysical ExertionSotalolHeartbeta-AlanineFlecainideAtrioventricular NodeHeart FailureSick Sinus SyndromeHeart DiseasesEchocardiographyEmbolismEchocardiography, TransesophagealInternational Normalized RatioDogsChronic DiseaseCryosurgeryWolff-Parkinson-White SyndromeDeath, Sudden, CardiacTachycardiaRisk AssessmentRetrospective StudiesBepridilDigoxinPredictive Value of TestsOxygen ConsumptionArrhythmia, SinusHemorrhageTachycardia, Ectopic AtrialIncidenceAtrial Function, RightHeart VentriclesPostoperative ComplicationsTachycardia, SupraventricularBradycardiaStroke VolumeCardiac CatheterizationHeart Valve DiseasesSinoatrial NodeDefibrillators, ImplantableHeart ArrestPericardiumPhysical EnduranceMitral ValveAtrial SeptumMyocardiumModels, CardiovascularAdrenergic beta-AntagonistsVentricular Dysfunction, LeftAspirinBlood PressureHeart BlockMyocardial ContractionVentricular Function, LeftPrognosisMuscle, SkeletalElectrophysiologyTachycardia, Ventricular