TachycardiaArrhythmias, CardiacTachycardia, VentricularTachycardia, SupraventricularTachycardia, Atrioventricular Nodal ReentryTachycardia, Ectopic AtrialTachycardia, ParoxysmalTachycardia, SinusElectrocardiographyCatheter AblationArrhythmia, SinusAnti-Arrhythmia AgentsHeart Conduction SystemTachycardia, Ectopic JunctionalElectrophysiologic Techniques, CardiacVentricular FibrillationCardiac Pacing, ArtificialPostural Orthostatic Tachycardia SyndromeTachycardia, Sinoatrial Nodal ReentryTachycardia, ReciprocatingVentricular Premature ComplexesAtrioventricular NodeHeart RateElectrocardiography, AmbulatoryBody Surface Potential MappingDefibrillators, ImplantableBundle of HisCardiac Complexes, PrematureDeath, Sudden, CardiacWolff-Parkinson-White SyndromeAtrial FlutterFlecainideAmiodaroneHeart VentriclesAtrial FibrillationHeart AtriaElectric CountershockHeart BlockProcainamideLong QT SyndromeElectrophysiologyEndocardiumHeartDogsSyncopeCryosurgeryFollow-Up StudiesBundle-Branch BlockPre-Excitation SyndromesTreatment OutcomeVentricular DysfunctionEpicardial MappingBradycardiaSotalolTime FactorsPropafenoneCardiomyopathiesAccessory Atrioventricular BundleTorsades de PointesArrhythmogenic Right Ventricular DysplasiaMyocardial InfarctionPericardiumPacemaker, ArtificialCardiac ElectrophysiologyDeath, SuddenNAV1.5 Voltage-Gated Sodium ChannelRecurrenceMyocardiumAction PotentialsAdrenergic beta-AntagonistsAtrial Premature ComplexesDigitalis GlycosidesAtrioventricular BlockMexiletineMyocardial IschemiaBlood PressureMyocytes, CardiacEchocardiographyHemodynamicsPropranololRefractory Period, ElectrophysiologicalModels, CardiovascularSinoatrial NodeVerapamilRetrospective StudiesCardiomyopathy, DilatedHeart ArrestProspective StudiesTelemetryDisopyramideHydrops FetalisTetralogy of FallotPulmonary VeinsAutonomic Nervous SystemDigoxinCalsequestrinIsoproterenolVoltage-Sensitive Dye ImagingEncainideSignal Processing, Computer-Assisted