Venous PressureCentral Venous PressurePortal VeinHypertension, PortalHypertensionBlood PressurePressurePortal SystemHypertension, PulmonaryPortal PressureBlood Pressure DeterminationHemodynamicsHypertension, RenalAntihypertensive AgentsHydrostatic PressureLiver CirculationVascular ResistanceTransducers, PressureHypertension, RenovascularHeart RateCapillary ResistanceHepatic VeinsEsophageal and Gastric VaricesIntracranial PressureRegional Blood FlowHypertension, MalignantBlood Pressure Monitoring, AmbulatoryJugular VeinsIntraocular PressureLiver CirrhosisCardiac OutputDogsPulmonary Wedge PressureVeinsArterial PressureBlood VolumePortasystemic Shunt, SurgicalSplanchnic CirculationPulmonary ArteryTime FactorsSplenic VeinReninSympathetic Nervous SystemKidneyProspective StudiesHypertension, Pregnancy-InducedVenous InsufficiencyRats, Inbred SHRGastrointestinal HemorrhageOcular HypertensionPlethysmographyVascular CapacitanceTreatment OutcomeMesenteric VeinsPlasma SubstitutesPostureHepatic ArteryBlood Flow VelocityRisk FactorsFluid TherapyPulmonary CirculationLower Body Negative PressureAtmospheric PressureIntracranial HypertensionSystoleBlood CirculationVasodilator AgentsAir PressurePressoreceptorsMonitoring, IntraoperativeAngiotensin IIDiastoleRats, Inbred WKYHypovolemiaNorepinephrineRats, Sprague-DawleyCerebrospinal Fluid PressureFollow-Up StudiesLiverComplianceHypotensionVentricular PressureLigationDisease Models, AnimalArteriesVasoconstrictionRenal VeinsSodium ChlorideSodium Chloride, DietaryTourniquetsVena Cava, InferiorVaricose VeinsRetrospective StudiesMonitoring, PhysiologicChronic DiseaseBaroreflexAnesthesiaConstrictionSupine PositionDesoxycorticosterone