Hypertension, PortalSplenomegalyPortal VeinPortal SystemPortal PressureEsophageal and Gastric VaricesSplenic VeinPortasystemic Shunt, SurgicalHypertensionLiver CirrhosisGastrointestinal HemorrhageLiver CirculationHypersplenismHypertension, PulmonarySplenectomyVenous PressureAscitesPortographyPortasystemic Shunt, Transjugular IntrahepaticSplenorenal Shunt, SurgicalSplenic ArteryPortacaval Shunt, SurgicalHepatic VeinsMesenteric VeinsSplanchnic CirculationLigationSplenic DiseasesLiverHepatomegalyBlood PressureLiver Diseases, ParasiticLiver DiseasesLiver Cirrhosis, ExperimentalSclerotherapyHypertension, RenalHepatic Encephalopathy