Hypertension, PortalPortal VeinPortal SystemPortal PressureEsophageal and Gastric VaricesSplenic VeinPortasystemic Shunt, SurgicalLiver CirculationHypertensionLiver CirrhosisVeinsGastrointestinal HemorrhageMesenteric VeinsHepatic VeinsHypertension, PulmonaryPortographyHypersplenismSplenorenal Shunt, SurgicalVenous PressurePortacaval Shunt, SurgicalPortasystemic Shunt, Transjugular IntrahepaticSplenic ArteryAscitesVaricose VeinsHepatic ArteryLigationSplanchnic CirculationSplenectomyLiverSplenomegalyVenous ThrombosisSaphenous VeinSclerotherapyBlood PressureLiver Cirrhosis, ExperimentalLiver Diseases, ParasiticLiver TransplantationRenal VeinsLiver DiseasesHepatic EncephalopathyHypertension, RenalSplenic DiseasesBudd-Chiari SyndromeAntihypertensive AgentsHematemesisVena Cava, InferiorFemoral VeinLiver Cirrhosis, AlcoholicJugular VeinsHepatectomyTreatment OutcomeHypertension, RenovascularPulmonary VeinsHemodynamicsLiver NeoplasmsHepatopulmonary SyndromeLiver Function TestsAzygos VeinHypertension, MalignantTomography, X-Ray ComputedPhlebographyRetrospective StudiesIliac VeinCollateral CirculationSchistosomiasis mansoniMelenaTime FactorsSclerosing SolutionsRats, Sprague-DawleyPostoperative ComplicationsRegional Blood FlowAngiographyFollow-Up StudiesEmbolization, TherapeuticArteriovenous FistulaCarcinoma, HepatocellularCarbon TetrachlorideMuscle, Smooth, VascularThrombosisUltrasonography, DopplerBile DuctsUmbilical VeinsRisk FactorsLypressinStomach DiseasesVascular ResistanceRats, WistarConstriction, PathologicProspective StudiesAnastomosis, SurgicalDogsCholestasisElasticity Imaging TechniquesHemorrhageHemostasis, EndoscopicVasoconstrictor AgentsVasodilator AgentsHydrothoraxNitric OxideUltrasonography, Doppler, Color