Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorIntestinal ObstructionArteriesAirway ObstructionUreteral ObstructionMesenteric Vascular OcclusionVena Cava, InferiorCeliac ArterySuperior Mesenteric Artery SyndromePulmonary ArteryRenal ArteryInferior ColliculiDuodenal ObstructionCerebral ArteriesVasodilationMuscle, Smooth, VascularFemoral ArteryCarotid ArteriesVasoconstrictionSplanchnic CirculationMesenteric VeinsBasilar ArteryNasal ObstructionBiological FactorsVasoconstrictor AgentsUrinary Bladder Neck ObstructionUrethral ObstructionVasodilator AgentsIliac ArteryTomography, X-Ray ComputedGastric Outlet ObstructionSplenic ArteryEndothelium, VascularVentricular Outflow ObstructionTreatment OutcomeVertebral ArteryHepatic ArteryNorepinephrineCoronary Artery BypassRats, WistarConstriction, PathologicPhenylephrineTime FactorsAngiographyRadial ArteryMyographyDuodenostomyMammary ArteriesVena Cava, SuperiorAcetylcholineCarotid Artery, InternalSubclavian ArteryRats, Sprague-DawleyStentsMuscle ContractionCoronary VesselsBlood PressureLacrimal Duct ObstructionRats, Inbred WKYMuscle RelaxationCarotid Artery DiseasesDose-Response Relationship, DrugNitric OxideSuperior ColliculiBrachial ArteryArterial Occlusive DiseasesAneurysmMagnetic Resonance ImagingRegional Blood FlowRetrospective StudiesEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonRenal Artery ObstructionDogsSuperior Vena Cava SyndromeFollow-Up StudiesRats, Inbred SHRPostoperative ComplicationsRabbitsUltrasonography, DopplerPotassium ChlorideOphthalmic ArteryCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidNG-Nitroarginine Methyl EsterRenal VeinsProspective StudiesUmbilical ArteriesMiddle Cerebral ArteryCoronary AngiographyLigationThoracic ArteriesBlood Vessel Prosthesis ImplantationAorta, ThoracicDisease Models, AnimalAortaVascular Surgical ProceduresBronchial Arteries