Tachycardia, Ectopic AtrialTachycardiaTachycardia, SupraventricularTachycardia, VentricularCatheter AblationTachycardia, ParoxysmalTachycardia, Atrioventricular Nodal ReentryElectrophysiologic Techniques, CardiacTachycardia, SinusElectrocardiographyHeart AtriaTachycardia, Sinoatrial Nodal ReentryHeart Conduction SystemBody Surface Potential MappingCardiac Pacing, ArtificialBundle of HisAtrial FibrillationAtrial FlutterAnti-Arrhythmia AgentsTachycardia, Ectopic JunctionalAtrioventricular NodePulmonary VeinsPostural Orthostatic Tachycardia SyndromeTachycardia, ReciprocatingCoronary SinusArrhythmias, CardiacWolff-Parkinson-White SyndromeAtrial Function, RightCryosurgeryElectrocardiography, AmbulatoryFlecainideHeart RateHeart BlockAmiodaroneTreatment OutcomeElectrophysiologyFollow-Up StudiesDogsStellate GanglionDefibrillators, ImplantableVentricular FibrillationRecurrenceSinoatrial NodeRefractory Period, ElectrophysiologicalAtrial Premature ComplexesAtrial FunctionArrhythmia, SinusPacemaker, ArtificialVentricular Premature ComplexesTime FactorsProcainamideEndocardiumAtrial AppendageBundle-Branch BlockPre-Excitation SyndromesFluoroscopyBee VenomsAccessory Atrioventricular BundleHeart VentriclesCardiac Complexes, PrematureRetrospective StudiesHeart Defects, CongenitalDeath, Sudden, CardiacElectric CountershockSyncopeHeartEpicardial MappingPostoperative ComplicationsElectrodesFontan ProcedureAminophyllineEchocardiographyMitral ValveProspective StudiesAdenosineCardiac Surgical ProceduresSotalolPredictive Value of TestsHydrops FetalisArrhythmogenic Right Ventricular DysplasiaDisease Models, AnimalCardiomyopathiesAction PotentialsReoperationPericardiumAdrenergic beta-AntagonistsCardiac ElectrophysiologyPropafenoneBradycardiaBlood PressurePre-Excitation, Mahaim-TypeVerapamilAtrioventricular BlockPropranololHemodynamicsMyocardial InfarctionInfant, NewbornEquipment DesignHeart FailureDigoxin