Tachycardia, Atrioventricular Nodal ReentryTachycardiaTachycardia, SupraventricularTachycardia, VentricularCatheter AblationAtrioventricular NodeTachycardia, Sinoatrial Nodal ReentryTachycardia, ParoxysmalElectrocardiographyTachycardia, SinusElectrophysiologic Techniques, CardiacHeart Conduction SystemTachycardia, Ectopic AtrialBundle of HisCryosurgeryCardiac Pacing, ArtificialTachycardia, Ectopic JunctionalHeart BlockAccessory Atrioventricular BundleWolff-Parkinson-White SyndromeTachycardia, ReciprocatingAtrial FlutterAnti-Arrhythmia AgentsBody Surface Potential MappingAtrioventricular BlockPre-Excitation SyndromesPostural Orthostatic Tachycardia SyndromeMetaproterenolHeart AtriaArrhythmias, CardiacElectrophysiologyFollow-Up StudiesFluoroscopyTreatment OutcomePre-Excitation, Mahaim-TypeCardiac ElectrophysiologyRecurrenceElectrocoagulationHeart RateElectrocardiography, AmbulatoryPulsed Radiofrequency TreatmentEncainideVentricular FibrillationAzygos VeinRadio WavesHeart SeptumAtrial FibrillationDefibrillators, ImplantableHeart Defects, CongenitalSinoatrial NodeCardiac CatheterizationRetrospective StudiesTime FactorsAmiodaroneFlecainideVentricular Premature ComplexesProspective StudiesProcainamidePostoperative ComplicationsEndocardiumBundle-Branch BlockIsoproterenolHeart VentriclesCardiac Complexes, PrematureHeart Function TestsDeath, Sudden, CardiacAutonomic Nervous SystemHeartElectric CountershockSyncopeAdenosineEpicardial MappingSotalolHydrops FetalisArrhythmogenic Right Ventricular DysplasiaPredictive Value of TestsCardiomyopathiesDogsIncidencePacemaker, ArtificialSensitivity and SpecificityPericardiumAdrenergic beta-AntagonistsPropafenoneBradycardiaBlood PressureVerapamilPropranololHemodynamicsRisk FactorsMyocardial InfarctionDigoxinMexiletineTilt-Table TestVentricular DysfunctionAge FactorsCalsequestrinEchocardiographyDeath, SuddenAtrial Function, Right