Femoral VeinCatheter AblationCatheters, IndwellingCatheterization, Central VenousJugular VeinsSubclavian VeinCatheterization, PeripheralAtrial FibrillationPulmonary VeinsElectrophysiologic Techniques, CardiacVeinsTachycardia, SupraventricularCathetersWolff-Parkinson-White SyndromeTachycardia, Atrioventricular Nodal ReentryTachycardia, Ectopic AtrialBody Surface Potential MappingAtrial FlutterTachycardia, VentricularElectrocardiographyHeart AtriaHeart Conduction SystemSaphenous VeinTreatment OutcomeAtrioventricular NodePopliteal VeinVaricose VeinsFluoroscopyIliac VeinRecurrenceCardiac CathetersVentricular Premature ComplexesCatheterizationFollow-Up StudiesAblation TechniquesTachycardia, ParoxysmalPhlebographyAccessory Atrioventricular BundleTachycardiaTachycardia, Sinoatrial Nodal ReentryElectrocoagulationPortal VeinSwineSurgery, Computer-AssistedCryosurgeryVenous InsufficiencyAnti-Arrhythmia AgentsEpicardial MappingTime FactorsVenous ValvesCardiac CatheterizationCardiac Pacing, ArtificialVenous ThrombosisVena Cava, InferiorUltrasonography, Doppler, DuplexBundle of HisEquipment DesignInsulinPre-Excitation, Mahaim-TypeTricuspid ValveRats, Sprague-DawleyPulmonary Veno-Occlusive DiseaseArrhythmias, CardiacAzygos VeinPericardiumProspective StudiesTachycardia, Ectopic JunctionalFeasibility StudiesRadio WavesEndocardiumMesenteric VeinsRetrospective StudiesRadiography, InterventionalThighCoronary SinusHeart BlockHeart SeptumElectrocardiography, AmbulatoryLegFemoral ArteryThrombophlebitisPostoperative ComplicationsAtrial Function, LeftDogsHepatic VeinsTachycardia, SinusAtrial Function, RightCentral Venous CathetersElectrophysiologyEquipment FailureAtrial Premature ComplexesThrombosisVascular PatencyCardiac Complexes, PrematureVascular MalformationsEsophageal FistulaAtrial AppendageElectrodesTherapeutic IrrigationAnticoagulants