Mesenteric VeinsPortal VeinVena Cava, InferiorMesenteric Vascular OcclusionMesenteric ArteriesMesenteric Artery, SuperiorPortal SystemPancreaticoduodenectomySplenic VeinHepatic ArteryCeliac ArteryDuodenumHypertension, PortalVeinsIliac VeinHepatic VeinsSplenic ArteryArteriesStomachVenous ThrombosisEmbolization, TherapeuticAneurysmSplanchnic CirculationMesenteric Artery, InferiorTomography, X-Ray ComputedAngiographyAneurysm, FalseRenal VeinsVena Cava, SuperiorVena Cava FiltersAmpulla of VaterGastrointestinal HemorrhageAzygos VeinThrombosisFemoral VeinVenae CavaeSaphenous VeinTreatment OutcomePulmonary ArteryDuodenal DiseasesPeptic UlcerPancreatic NeoplasmsLiver CirculationStomach DiseasesVaricose VeinsMuscle, Smooth, VascularRenal ArteryBudd-Chiari SyndromePulmonary VeinsCarotid ArteriesFemoral ArteryCerebral ArteriesJugular VeinsVasoconstrictionNorepinephrineSuperior Vena Cava SyndromeDogsPhlebographyBasilar ArteryPortasystemic Shunt, SurgicalTime FactorsPortal PressureVascular NeoplasmsAnastomosis, SurgicalDuodenal UlcerGastric MucosaIliac ArteryHelicobacter pyloriSuperior Mesenteric Artery SyndromeStomach UlcerVasodilationRegional Blood FlowConstriction, PathologicLiverVertebral ArteryEsophageal and Gastric VaricesRetrospective StudiesVascular Surgical ProceduresVisceraCoronary Artery BypassPulmonary EmbolismRadial ArteryMammary ArteriesHelicobacter InfectionsUmbilical VeinsMuscle ContractionInferior ColliculiEndothelium, VascularRats, Sprague-DawleyGastritisVasoconstrictor AgentsCarotid Artery, InternalVasodilator AgentsLigationSubclavian ArteryPylorusRabbitsDuodenitisVascular MalformationsPortography