Atrial FibrillationFlecainidePulmonary VeinsTachycardia, ParoxysmalCatheter AblationHeart AtriaAnti-Arrhythmia AgentsElectrophysiologic Techniques, CardiacElectrocardiography, AmbulatoryElectrocardiographyAtrial Premature ComplexesAtrial FlutterSick Sinus SyndromeElectric CountershockCardiac Pacing, ArtificialHeart Conduction SystemCryosurgeryAmiodaroneVentricular FibrillationWarfarinTreatment OutcomeAnticoagulantsAtrial Function, LeftRecurrencePacemaker, ArtificialBody Surface Potential MappingPropafenoneAtrial FunctionAtrial SeptumSotalolFollow-Up StudiesThromboembolismTachycardia, Ectopic AtrialAtrioventricular NodeRefractory Period, ElectrophysiologicalAtrial AppendageProspective StudiesStrokeArrhythmia, SinusBepridilTime FactorsHeart RateTachycardiaWolff-Parkinson-White SyndromeVena Cava, SuperiorAtrial Function, RightTachycardia, SupraventricularSinoatrial NodeBradycardiaRisk FactorsEchocardiographyArrhythmias, CardiacEchocardiography, TransesophagealAutonomic Nervous SystemRetrospective StudiesStellate GanglionDisopyramideTachycardia, ReciprocatingSinus Arrest, CardiacCardiac Complexes, PrematurePredictive Value of Testsbeta-AlanineVagus NerveAdrenergic beta-AntagonistsChronic DiseaseRisk AssessmentHeart SeptumInternational Normalized RatioDogsPostoperative ComplicationsIncidenceEmbolismElectrophysiologySignal Processing, Computer-AssistedCatheterizationChi-Square DistributionEquipment DesignDigoxinLidocaineKaplan-Meier EstimateHemorrhageCardiac Surgical ProceduresCross-Over StudiesFeasibility StudiesCardiac CatheterizationPrognosisHeart FailureBrain IschemiaHeart Valve Diseases