Hypertension, PortalPortal VeinPortal SystemPortal PressureEsophageal and Gastric VaricesPortasystemic Shunt, SurgicalHypertensionSplenic VeinLiver CirrhosisGastrointestinal HemorrhageLiver CirculationHypertension, PulmonaryHypersplenismVenous PressurePortographyPortasystemic Shunt, Transjugular IntrahepaticSplenorenal Shunt, SurgicalAscitesPortacaval Shunt, SurgicalSplenic ArteryHepatic VeinsMesenteric VeinsSplenectomySplenomegalySplanchnic CirculationLigationLiverBlood PressureLiver Cirrhosis, ExperimentalSclerotherapyHypertension, RenalLiver Diseases, ParasiticHepatic EncephalopathySplenic DiseasesLiver Diseases