Pulmonary VeinsCatheters, IndwellingCatheter AblationAtrial FibrillationCathetersPulmonary Veno-Occlusive DiseaseVeinsHeart AtriaElectrophysiologic Techniques, CardiacCardiac CathetersCryosurgerySaphenous VeinCatheterizationPortal VeinHeart Conduction SystemBody Surface Potential MappingVaricose VeinsTachycardia, Ectopic AtrialJugular VeinsCatheterization, Central VenousFemoral VeinTreatment OutcomeVena Cava, SuperiorFluoroscopyRecurrenceCentral Venous CathetersEquipment DesignCatheterization, PeripheralPhlebographyTachycardia, ParoxysmalElectrocardiographySurgery, Computer-AssistedSubclavian VeinConstriction, PathologicDogsUrinary CatheterizationFollow-Up StudiesAtrial FlutterAnti-Arrhythmia AgentsMesenteric VeinsAtrial SeptumIliac VeinScimitar SyndromeUmbilical VeinsRenal VeinsAtrial Premature ComplexesAutonomic DenervationImaging, Three-DimensionalHepatic VeinsAtrial FunctionUrinary CathetersTime FactorsAtrial AppendageCardiac Pacing, ArtificialEquipment FailureEchocardiography, TransesophagealPopliteal VeinAtrial Function, LeftCardiac CatheterizationAzygos VeinBreath HoldingElectrocardiography, AmbulatoryPulmonary ArteryProspective StudiesAngiographyCardiac Complexes, PrematureCatheter-Related InfectionsTomography, X-Ray ComputedTachycardiaElectrophysiological PhenomenaFeasibility StudiesCoronary SinusPulmonary CirculationCerebral VeinsSinoatrial NodeSplenic VeinBrachiocephalic VeinsRetrospective StudiesHeart Septal Defects, AtrialMagnetic Resonance AngiographyLymphangiectasisRefractory Period, ElectrophysiologicalPericardiumTomography, Spiral ComputedTherapeutic IrrigationUltrasonography, InterventionalPulmonary AtresiaVenae CavaeVena Cava, InferiorEchocardiographyRadiography, InterventionalAxillary VeinRetinal VeinCardiac Imaging TechniquesCardiac Surgical ProceduresElectrodesForeign-Body MigrationArrhythmias, CardiacRespiratory-Gated Imaging TechniquesGanglia, Autonomic