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, PrematureElectrophysiologyTreatment OutcomeDeath, Sudden, CardiacFollow-Up StudiesElectric CountershockSyncopeEpicardial MappingSotalolAtrial FibrillationRecurrenceHydrops FetalisTime FactorsArrhythmogenic Right Ventricular DysplasiaDogsCardiomyopathiesPacemaker, ArtificialAdrenergic beta-AntagonistsPericardiumCardiac ElectrophysiologyBlood PressurePropafenoneBradycardiaRetrospective StudiesPre-Excitation, Mahaim-TypeVerapamilHeartHemodynamicsAtrioventricular BlockPropranololMyocardial InfarctionDigoxinProspective StudiesSinoatrial NodeMexiletineTilt-Table TestVentricular DysfunctionElectrocoagulationEchocardiographyDeath, SuddenCardiac CatheterizationCalsequestrinFetal DiseasesIsoproterenolAtrial Function, RightCardiomyopathy, DilatedRefractory Period, ElectrophysiologicalCicatrixHeart ArrestLong QT SyndromeAtrial Premature ComplexesPulmonary VeinsTorsades de PointesBrugada SyndromeSympathetic Nervous SystemCoronary SinusPredictive Value of TestsPurkinje FibersPropanolaminesPostoperative ComplicationsDisopyramide