Venous PressureCentral Venous PressurePressureBlood PressureHeterotrimeric GTP-Binding ProteinsHydrostatic PressureBlood Pressure DeterminationHemodynamicsTransducers, PressureHypertension, PortalCapillary ResistanceIntracranial PressureJugular VeinsVascular ResistanceHeart RateIntraocular PressureRegional Blood FlowCardiac OutputVeinsHypertensionPulmonary Wedge PressureDogsBlood VolumeHepatic VeinsArterial PressureVenous InsufficiencyLiver CirculationBlood Pressure Monitoring, AmbulatoryPlasma SubstitutesVascular CapacitancePlethysmographyLower Body Negative PressureFluid TherapyAir PressureAtmospheric PressurePortal VeinPostureMonitoring, IntraoperativeHypovolemiaCerebrospinal Fluid PressureSplanchnic CirculationTourniquetsLiver CirrhosisSympathetic Nervous SystemEsophageal and Gastric VaricesBlood CirculationTime FactorsVentricular PressurePressoreceptorsPortal SystemLegAntihypertensive AgentsHypotensionSupine PositionMonitoring, PhysiologicHydroxyethyl Starch DerivativesHead-Down TiltOsmotic PressureBlood Flow VelocityAnesthesiaFemoral VeinCompliancePositive-Pressure RespirationVaricose VeinsIsotonic SolutionsReflexScleraAnesthesia, GeneralBaroreflexProspective StudiesDiastoleHeartConstrictionVena Cava, SuperiorOxygenVaricose UlcerRespirationPopliteal VeinEmbolism, AirModels, CardiovascularVena Cava, InferiorForearmRenal VeinsFontan ProcedurePulmonary CirculationPropoxycaineFootCatheterization, Central VenousPulmonary ArteryPulmonary EdemaAtrial Function, RightArteriesCardiovascular SystemSystoleColloidsHeart Bypass, RightCarbon DioxideCatheterization, PeripheralBlood Volume DeterminationTreatment Outcome