Heart BlockAtrial FibrillationHeart AtriaCatheter AblationVentricular FibrillationAnti-Arrhythmia AgentsPulmonary VeinsElectrocardiographyHeartElectric CountershockAdams-Stokes SyndromeCardiac Pacing, ArtificialHeart Conduction SystemWarfarinPacemaker, ArtificialHeart RateAtrial FlutterAnticoagulantsElectrophysiologic Techniques, CardiacAtrioventricular NodeAtrial AppendageAmiodaroneTreatment OutcomeBradycardiaElectrocardiography, AmbulatoryFollow-Up StudiesThromboembolismHeart FailureStrokeRefractory Period, ElectrophysiologicalAtrial FunctionTachycardia, ParoxysmalAtrial Function, LeftAtrioventricular BlockTime FactorsHeart DiseasesRisk FactorsRecurrenceSick Sinus SyndromeAtrial Premature ComplexesProspective StudiesPropafenoneArrhythmias, CardiacEchocardiographySinoatrial NodeBody Surface Potential MappingSotalolBundle of Hisbeta-AlanineFlecainideArrhythmia, SinusRNA, Small CytoplasmicHeart Defects, CongenitalDogsInternational Normalized RatioEmbolismCardiac Surgical ProceduresAntibodies, AntinuclearEchocardiography, TransesophagealFetal HeartFetal DiseasesCryosurgeryRetrospective StudiesWolff-Parkinson-White SyndromeIncidenceBundle-Branch BlockTachycardiaChronic DiseaseBepridilDigoxinRisk AssessmentPostoperative ComplicationsTachycardia, Ectopic AtrialMyocardiumHemorrhageAtrial Function, RightHeart Rate, FetalTachycardia, SupraventricularHeart SeptumPredictive Value of TestsCardiac CatheterizationAtrial SeptumSyncopePrognosisDefibrillators, ImplantableHeart ValvesMyocardial InfarctionHeart Valve DiseasesCardiomyopathiesMitral ValveMagnetocardiographyAspirinMaternal-Fetal ExchangeRibonucleoproteinsElectrophysiologyNerve BlockSteroids, FluorinatedAdrenergic beta-AntagonistsMyocytes, CardiacModels, Cardiovascular