Tachycardia, Ectopic AtrialTachycardia, ParoxysmalStellate GanglionTachycardiaTachycardia, SupraventricularTachycardia, VentricularCatheter AblationTachycardia, 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 StudiesDogsDefibrillators, ImplantableVentricular FibrillationRecurrenceSinoatrial NodeRefractory Period, ElectrophysiologicalAtrial Premature ComplexesAtrial FunctionArrhythmia, SinusPacemaker, ArtificialVentricular Premature ComplexesTime FactorsProcainamideEndocardiumAtrial AppendageBundle-Branch BlockPre-Excitation SyndromesFluoroscopyBee VenomsAccessory Atrioventricular BundleHeart VentriclesCardiac Complexes, PrematureRetrospective Studies