Vena Cava, SuperiorSuperior Vena Cava SyndromeVena Cava, InferiorBrachiocephalic VeinsAzygos VeinVena Cava FiltersVenae CavaePhlebographyVascular MalformationsCoronary SinusCatheterization, Central VenousHeart AtriaPulmonary VeinsJugular VeinsHeart Bypass, RightDevice RemovalTomography, X-Ray ComputedSubclavian VeinMediastinal NeoplasmsMediastinal DiseasesVascular NeoplasmsCardiovascular AbnormalitiesIncidental FindingsHepatic VeinsHeart Defects, CongenitalPulmonary EmbolismPacemaker, ArtificialCatheter AblationVenous ThrombosisChylothoraxConstriction, PathologicMediastinal CystEchocardiography, TransesophagealCentral Venous CathetersRenal VeinsFemoral VeinHeart Septal Defects, AtrialTreatment OutcomeBudd-Chiari SyndromeEquipment FailurePeritoneovenous ShuntCyanosisCatheterizationHeart NeoplasmsVascular DiseasesHydrothoraxCollateral CirculationStentsCatheters, IndwellingCardiac Surgical ProceduresProsthesis ImplantationThymomaEchocardiographyMediastinitisElectrodes, ImplantedVenous PressureScimitar SyndromeHeart Septal DefectsAtrial SeptumPericardiumIliac VeinVeinsPulmonary ArteryFontan ProcedureCoronary Vessel AnomaliesSinoatrial NodeAbnormalities, MultipleEmpyema, TuberculousAnastomosis, SurgicalCatheterization, Swan-GanzAtrial FibrillationMiddle Lobe SyndromeCardiac CatheterizationCardiac Pacing, ArtificialThymus NeoplasmsCarcinoma, BronchogenicElectrophysiologic Techniques, CardiacThoracic NeoplasmsArrhythmia, SinusDilatation, PathologicBlood Vessel Prosthesis ImplantationThrombosisTricuspid ValveAtrial FlutterPolytetrafluoroethyleneVascular Surgical ProceduresThoracic Surgical ProceduresForeign-Body MigrationFistulaSick Sinus SyndromeUpper Extremity Deep Vein ThrombosisBehcet SyndromeDogsConstrictionMyxomaCardiac Complexes, PrematureUltrasonography, PrenatalBlood Flow VelocityFatal OutcomeKinetocardiography