Venous PressureCentral Venous PressurePressurePortal VeinBlood PressureHypertension, PortalHypertensionPortal PressureHypertension, PulmonaryPortal SystemHydrostatic PressureBlood Pressure DeterminationHemodynamicsTransducers, PressureAntihypertensive AgentsHypertension, RenalIntracranial PressureHeart RateIntraocular PressureBlood Pressure Monitoring, AmbulatoryVascular ResistanceLiver CirculationHypertension, RenovascularArterial PressurePulmonary Wedge PressureCapillary ResistanceRegional Blood FlowDogsHepatic VeinsCardiac OutputAtmospheric PressureAir PressureEsophageal and Gastric VaricesTime FactorsHypertension, MalignantJugular VeinsBlood VolumeVentricular PressureLiver CirrhosisPulmonary ArteryVeinsReninSympathetic Nervous SystemSplanchnic CirculationSystoleKidneyPortasystemic Shunt, SurgicalProspective StudiesRats, Inbred SHRDiastoleCerebrospinal Fluid PressureBlood Flow VelocityPostureTreatment OutcomeLower Body Negative PressureSplenic VeinPressoreceptorsOcular HypertensionHypotensionOsmotic PressurePlethysmographyHypertension, Pregnancy-InducedIntracranial HypertensionRats, Sprague-DawleyAngiotensin IIVascular CapacitanceNorepinephrineVasodilator AgentsVenous InsufficiencyRats, Inbred WKYComplianceBlood CirculationFollow-Up StudiesPlasma SubstitutesArteriesGastrointestinal HemorrhagePulseFluid TherapyBaroreflexMesenteric VeinsDisease Models, AnimalVasoconstrictionMonitoring, PhysiologicMonitoring, IntraoperativePositive-Pressure RespirationSodium Chloride, DietaryHeartSodium ChlorideHepatic ArteryHypovolemiaAnesthesiaOxygenRisk FactorsCardiovascular SystemPulmonary CirculationVasoconstrictor AgentsRetrospective StudiesLigationConstrictionReflex