TachycardiaTachycardia, VentricularTachycardia, SupraventricularTachycardia, Atrioventricular Nodal ReentryTachycardia, ParoxysmalTachycardia, Ectopic AtrialTachycardia, SinusCatheter AblationElectrocardiographyTachycardia, Ectopic JunctionalPostural Orthostatic Tachycardia SyndromeTachycardia, ReciprocatingTachycardia, Sinoatrial Nodal ReentryHeart Conduction SystemElectrophysiologic Techniques, CardiacCardiac Pacing, ArtificialAnti-Arrhythmia AgentsAtrioventricular NodeBundle of HisBody Surface Potential MappingArrhythmias, CardiacWolff-Parkinson-White SyndromeVentricular FibrillationHeart RateDefibrillators, ImplantableAmiodaroneElectrocardiography, AmbulatoryFlecainideVentricular Premature ComplexesCryosurgeryHeart AtriaProcainamideEndocardiumAtrial FlutterHeart BlockBundle-Branch BlockPre-Excitation SyndromesAccessory Atrioventricular BundleHeart VentriclesCardiac Complexes, PrematureElectrophysiologyDeath, Sudden, CardiacElectric CountershockSyncopeEpicardial MappingFollow-Up StudiesTreatment OutcomeSotalolAtrial FibrillationHydrops FetalisArrhythmogenic Right Ventricular DysplasiaRecurrenceCardiomyopathiesDogsPacemaker, ArtificialPericardiumAdrenergic beta-AntagonistsCardiac ElectrophysiologyTime FactorsPropafenoneBradycardiaBlood PressurePre-Excitation, Mahaim-TypeVerapamilHeartAtrioventricular BlockPropranololHemodynamicsMyocardial InfarctionDigoxinSinoatrial NodeMexiletineTilt-Table TestRetrospective StudiesVentricular DysfunctionElectrocoagulationCalsequestrinEchocardiographyCardiac CatheterizationDeath, SuddenIsoproterenolAtrial Function, RightFetal DiseasesCardiomyopathy, DilatedRefractory Period, ElectrophysiologicalProspective StudiesCicatrixHeart ArrestLong QT SyndromeAtrial Premature ComplexesPulmonary VeinsTorsades de PointesBrugada SyndromeSympathetic Nervous SystemCoronary SinusPurkinje FibersPropanolaminesDisopyramideCatecholaminesRyanodine Receptor Calcium Release Channel