Intestinal ObstructionMesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesAirway ObstructionUreteral ObstructionMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryPulmonary ArteryRenal ArteryDuodenal ObstructionCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesFemoral ArteryVasoconstrictionSplanchnic CirculationBasilar ArteryMesenteric VeinsBiological FactorsUrinary Bladder Neck ObstructionUrethral ObstructionVasoconstrictor AgentsVasodilator AgentsNasal ObstructionGastric Outlet ObstructionIliac ArterySplenic ArteryVentricular Outflow ObstructionEndothelium, VascularTomography, X-Ray ComputedNorepinephrineCoronary Artery BypassHepatic ArteryVertebral ArteryRats, WistarPhenylephrineMyographyRadial ArteryTreatment OutcomeDuodenostomyConstriction, PathologicMammary ArteriesAcetylcholineCarotid Artery, InternalSubclavian ArteryAngiographyRats, Sprague-DawleyStentsTime FactorsVena Cava, SuperiorMuscle ContractionLacrimal Duct ObstructionCoronary VesselsRats, Inbred WKYMuscle RelaxationBlood PressureCarotid Artery DiseasesDose-Response Relationship, DrugNitric OxideBrachial ArterySuperior ColliculiArterial Occlusive DiseasesEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonRenal Artery ObstructionAneurysmSuperior Vena Cava SyndromeRegional Blood FlowRats, Inbred SHRDogsOphthalmic ArteryPotassium ChlorideCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidNG-Nitroarginine Methyl EsterRetrospective StudiesRabbitsMiddle Cerebral ArteryUmbilical ArteriesUltrasonography, DopplerFollow-Up StudiesPostoperative ComplicationsThoracic ArteriesAorta, ThoracicBronchial ArteriesCoronary AngiographyCholestasisTemporal ArteriesAortaPopliteal ArteryLigationHydronephrosisIndomethacinHypertensionDisease Models, AnimalNitric Oxide Synthase