Atrial FlutterAtrial FibrillationCatheter AblationHeart AtriaElectric CountershockAnti-Arrhythmia AgentsElectrocardiographyChronic DiseasePulmonary VeinsCardiac Pacing, ArtificialPropafenoneAtrial AppendageElectrophysiologic Techniques, CardiacAmiodaroneHeart Conduction SystemWarfarinAtrial FunctionAnticoagulantsAtrial Function, LeftRefractory Period, ElectrophysiologicalVentricular FibrillationAtrioventricular NodeTachycardia, ParoxysmalTricuspid ValveTreatment OutcomeCryosurgeryDigoxinSick Sinus SyndromePacemaker, ArtificialRecurrenceBody Surface Potential MappingSotalolElectrocardiography, AmbulatoryFollow-Up StudiesArrhythmia, SinusProcainamideHeart BlockThromboembolismPericarditisHeart Valve DiseasesFlecainideAtrial Premature ComplexesEchocardiography, TransesophagealAtrial Function, RightTachycardia, SupraventricularBundle of HisMitral ValveTime FactorsProspective StudiesHeart RateTachycardiaStrokeDisopyramideTachycardia, Ectopic AtrialElectrophysiologyEchocardiographyRisk FactorsCardiac Surgical ProceduresDogsArrhythmias, CardiacHeart DiseasesRetrospective StudiesVena Cava, InferiorWolff-Parkinson-White SyndromeAction PotentialsEmbolismHeart FailureCoronary SinusAtrial Septumbeta-AlanineFluoroscopyPostoperative ComplicationsPredictive Value of TestsMitral Valve StenosisCardiac CathetersEchocardiography, DopplerInternational Normalized RatioHeart VentriclesIncidenceThrombosisSinoatrial NodeHydrops FetalisHeart Valve Prosthesis ImplantationRisk AssessmentBepridilCardiac CatheterizationDefibrillators, ImplantableSurgery, Computer-AssistedHemorrhageTachycardia, Sinoatrial Nodal ReentryTachycardia, VentricularMitral Valve InsufficiencyEquipment DesignEndocardiumTachycardia, Atrioventricular Nodal ReentryBradycardiaChi-Square DistributionMyocardiumAtrioventricular BlockSulfonamides