Hypertension, PortalVenous PressureCentral Venous PressurePortal VeinPortal PressureEsophageal and Gastric VaricesPortal SystemHypertensionBlood PressurePortasystemic Shunt, SurgicalPressureLiver CirrhosisSplenic VeinGastrointestinal HemorrhageHypertension, PulmonaryLiver CirculationHypersplenismHepatic VeinsAscitesPortasystemic Shunt, Transjugular IntrahepaticSplenorenal Shunt, SurgicalPortographySplenic ArterySplanchnic CirculationHemodynamicsPortacaval Shunt, SurgicalLigationBlood Pressure DeterminationSplenectomyMesenteric VeinsSplenomegalyAntihypertensive AgentsHypertension, RenalSclerotherapyVascular ResistanceHydrostatic PressureLiverLiver Cirrhosis, ExperimentalVaricose VeinsRegional Blood FlowLiver Diseases, ParasiticSplenic DiseasesHepatic EncephalopathyTransducers, PressureLiver Cirrhosis, AlcoholicHematemesisLiver DiseasesHypertension, RenovascularVeinsHeart RateCapillary ResistanceHepatic ArteryLiver TransplantationCardiac OutputTreatment OutcomeDogsIntracranial PressureTime FactorsRenal VeinsHepatopulmonary SyndromeHypertension, MalignantVena Cava, InferiorCollateral CirculationBlood VolumeBlood Pressure Monitoring, AmbulatoryBudd-Chiari SyndromeJugular VeinsIntraocular PressurePulmonary Wedge PressureBlood CirculationProspective StudiesArterial PressureRetrospective StudiesRats, Sprague-DawleyLiver Function TestsFollow-Up StudiesAzygos VeinPulmonary ArteryMelenaVasodilator AgentsSchistosomiasis mansoniKidneyBlood Flow VelocityVasoconstrictor AgentsChronic DiseaseHemorrhageLypressinReninPhlebographySympathetic Nervous SystemRisk FactorsPostoperative ComplicationsDisease Models, AnimalStomach DiseasesSeverity of Illness IndexVenous ThrombosisAdrenergic beta-AntagonistsSclerosing SolutionsConstriction, PathologicRats, Wistar