Venous PressurePortal VeinHypertensionHypertension, PortalHypertension, PulmonaryVaricose UlcerVenous InsufficiencyAxillary VeinFemoral VeinArteriovenous Shunt, SurgicalCerebral VeinsPortal SystemKlippel-Trenaunay-Weber SyndromeArteriovenous FistulaVaricose VeinsCentral Nervous System Vascular MalformationsSubclavian VeinUpper Extremity Deep Vein ThrombosisCentral Venous PressureVeinsCranial SinusesBrachiocephalic VeinsConstriction, PathologicPortal PressureJugular VeinsPhlebographyHypertension, RenalUltrasonographyBlood PressureLigationSaphenous VeinPulmonary EdemaUltrasonicsHemodynamicsUltrasonic TherapyHypertension, RenovascularAntihypertensive AgentsLegRenal DialysisChronic DiseaseVascular PatencyHigh-Intensity Focused Ultrasound AblationHypertension, MalignantTreatment OutcomeUltrasonography, InterventionalVascular Surgical ProceduresMicrocirculationMicrobubblesLiver CirculationUltrasonography, PrenatalRisk FactorsHypertension, Pregnancy-InducedProspective StudiesEsophageal and Gastric VaricesUltrasonography, DopplerPregnancyPortasystemic Shunt, SurgicalTransducersLeukocytesPulmonary ArteryOcular HypertensionUltrasonography, Doppler, ColorSplenic VeinTime FactorsLiver CirrhosisSensitivity and SpecificityKidneyFollow-Up StudiesBlood Pressure DeterminationRetrospective StudiesRats, Inbred SHRReninIntracranial HypertensionVascular ResistanceHepatic VeinsPortographyMesenteric VeinsHepatic ArteryContrast MediaReproducibility of ResultsLiverPrevalenceBlood Flow VelocityRats, Inbred WKYPredictive Value of TestsImaging, Three-DimensionalMicroscopy, AcousticDesoxycorticosteroneGastrointestinal HemorrhagePregnancy Complications, CardiovascularPortacaval Shunt, SurgicalTomography, X-Ray ComputedEndosonographyBlood Pressure Monitoring, AmbulatoryDisease Models, AnimalHypertrophy, Right VentricularRegional Blood FlowSodium Chloride, DietaryMonocrotalineAngiotensin II