Mesenteric Artery, SuperiorMesenteric ArteriesSuperior Mesenteric Artery SyndromeMesenteric Artery, InferiorMesenteric Vascular OcclusionCeliac ArteryArteriesSplanchnic CirculationDuodenostomyRenal ArteryMesenteric VeinsSplenic ArteryPulmonary ArteryVasodilationVasoconstrictionMuscle, Smooth, VascularHepatic ArteryAngiographyTomography, X-Ray ComputedCerebral ArteriesCarotid ArteriesVasoconstrictor AgentsFemoral ArteryAneurysmVasodilator AgentsDuodenal ObstructionBasilar ArteryReperfusion InjuryIliac ArteryIschemiaBiological FactorsRats, WistarEndothelium, VascularNorepinephrineRenal VeinsPhenylephrineConstriction, PathologicJejunostomyUltrasonography, DopplerAcetylcholineRats, Sprague-DawleyVisceraIntestinesRegional Blood FlowTreatment OutcomeStentsAneurysm, DissectingVertebral ArteryCoronary Artery BypassBlood Vessel Prosthesis ImplantationVascular Surgical ProceduresBlood PressureAbdominal PainAorta, AbdominalNitric OxideRats, Inbred WKYMyographyRadial ArteryTime FactorsMammary ArteriesIntestine, SmallAneurysm, FalsePortal VeinMuscle ContractionDose-Response Relationship, DrugCarotid Artery, InternalArterial Occlusive DiseasesSubclavian ArteryMesenteryEnterostomyPotassium ChlorideMuscle RelaxationEndovascular ProceduresCarotid Artery DiseasesCoronary VesselsAneurysm, RupturedBrachial ArteryAortic Aneurysm, AbdominalSuperior ColliculiNG-Nitroarginine Methyl EsterEmbolismVena Cava, SuperiorBlood Flow VelocityEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonAnastomosis, SurgicalVascular DiseasesVascular ResistanceDogsAortographyIndomethacinAortaAorta, ThoracicParenteral Nutrition, Home TotalEmbolization, TherapeuticRats, Inbred SHRNitric Oxide SynthaseLigationAngioplasty, BalloonRenal Artery Obstruction