Hypertension, PortalPortal VeinPortal SystemPortal PressureEsophageal and Gastric VaricesPortasystemic Shunt, SurgicalHypertensionSplenic VeinLiver CirrhosisGastrointestinal HemorrhageLiver CirculationHypertension, PulmonaryHypersplenismVenous PressurePortographyPortasystemic Shunt, Transjugular IntrahepaticAscitesSplenorenal Shunt, SurgicalPortacaval Shunt, SurgicalSplenic ArteryHepatic VeinsMesenteric VeinsSplenomegalySplenectomySplanchnic CirculationLigationLiverBlood PressureLiver Cirrhosis, ExperimentalHypertension, RenalSclerotherapyLiver Diseases, ParasiticHepatic EncephalopathySplenic DiseasesLiver Diseases