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 VeinsSplenectomySplenomegalySplanchnic CirculationLigationLiverBlood PressureLiver Cirrhosis, ExperimentalSclerotherapyHypertension, RenalLiver Diseases, ParasiticSplenic DiseasesLiver DiseasesHepatic Encephalopathy