Venous PressureCentral Venous PressurePressureBlood PressurePortal PressureHydrostatic PressureBlood Pressure DeterminationTransducers, PressureHemodynamicsHypertension, PortalCapillary ResistanceIntracranial PressureHeart RateVascular ResistanceIntraocular PressureJugular VeinsRegional Blood FlowCardiac OutputHypertensionDogsBlood VolumeVeinsPulmonary Wedge PressureHepatic VeinsTime FactorsReproducibility of ResultsArterial PressureLiver CirculationBlood Pressure Monitoring, AmbulatoryVenous InsufficiencyPlethysmographyPlasma SubstitutesPostureVascular CapacitanceAir PressureFluid TherapyMonitoring, IntraoperativeLower Body Negative PressureAtmospheric PressurePortal VeinBlood Flow VelocityHypovolemiaCerebrospinal Fluid PressureMonitoring, PhysiologicSplanchnic CirculationProspective StudiesLiver CirrhosisTourniquetsSympathetic Nervous SystemBlood CirculationEsophageal and Gastric VaricesLegVentricular PressureAntihypertensive AgentsSupine PositionOxygenPressoreceptorsHypotensionOsmotic PressurePortal SystemAnesthesiaReference ValuesHead-Down TiltComplianceHydroxyethyl Starch DerivativesFemoral VeinPositive-Pressure RespirationDiastoleHeartCarbon DioxideIsotonic SolutionsRespirationReflexModels, CardiovascularScleraVaricose VeinsTreatment OutcomeAnesthesia, GeneralSensitivity and SpecificityBaroreflexBlood Volume DeterminationConstrictionAnalysis of VarianceForearmPulmonary CirculationSystoleArteriesVena Cava, SuperiorFootVaricose UlcerCerebrovascular CirculationPulmonary ArteryVena Cava, InferiorPredictive Value of TestsPopliteal VeinPerfusionEmbolism, AirPulmonary EdemaColloidsFontan Procedure