Arrhythmias, CardiacAtrial FlutterAtrial FibrillationHeart AtriaArrhythmia, SinusElectrocardiographyTachycardia, Ectopic AtrialCatheter AblationAnti-Arrhythmia AgentsHeart Conduction SystemMyocytes, CardiacCardiac Pacing, ArtificialElectrophysiologic Techniques, CardiacTachycardia, SupraventricularTachycardiaTachycardia, SinusAtrial FunctionPropafenoneHeartSick Sinus SyndromePulmonary VeinsPacemaker, ArtificialTachycardia, VentricularElectrocardiography, AmbulatoryBody Surface Potential MappingCardiac ElectrophysiologyElectric CountershockSinoatrial NodeCardiac Surgical ProceduresDeath, Sudden, CardiacBradycardiaAtrial RemodelingAtrial Premature ComplexesHeart RateCardiac OutputMagnetocardiographyDogsMyocardiumFlecainideSinoatrial BlockStellate GanglionTime FactorsHeart DiseasesVentricular FibrillationHeart BlockHeart Septal Defects, AtrialCardiac CatheterizationTreatment OutcomeAtrial AppendageFollow-Up StudiesDisopyramideEchocardiographyAction PotentialsHeart VentriclesSotalolPericardiumHeart Defects, CongenitalQuinidineModels, CardiovascularRefractory Period, ElectrophysiologicalElectrophysiologyVentricular Premature ComplexesAtrioventricular NodeAutonomic Nervous SystemRecurrenceHeart TransplantationPostoperative ComplicationsRetrospective StudiesLong QT SyndromeCardiac Complexes, PrematureProspective StudiesMyocardial ContractionCardiomegalyHeart ArrestRisk FactorsCardiomyopathiesDefibrillators, ImplantableDisease Models, AnimalMyocardial InfarctionHeart FailureCardiac TamponadeMyocardial IschemiaEchocardiography, TransesophagealVentricular DysfunctionChi-Square DistributionNAV1.5 Voltage-Gated Sodium ChannelHemodynamicsMice, TransgenicIncidenceVentricular Function, LeftCardiac Imaging TechniquesMyocardial Reperfusion InjuryEquipment DesignCardiomyopathy, DilatedTorsades de PointesAmiodaroneMyoblasts, CardiacBlood PressureReoperationStroke Volume