ColicMesenteric ArteriesMesenteric Artery, SuperiorRenal ColicIschemiaMesenteric Artery, InferiorArteriesMyocardial IschemiaBrain IschemiaMesenteric Vascular OcclusionCeliac ArterySuperior Mesenteric Artery SyndromePulmonary ArteryRenal ArteryCerebral ArteriesFecal ImpactionFemoral ArteryReperfusion InjuryVasodilationCarotid ArteriesMuscle, Smooth, VascularVasoconstrictionSplanchnic CirculationHorse DiseasesBasilar ArteryMesenteric VeinsRats, WistarVasodilator AgentsBiological FactorsVasoconstrictor AgentsRats, Sprague-DawleyIliac ArteryTime FactorsEndothelium, VascularUreteral DiseasesSplenic ArteryNorepinephrineCoronary Artery BypassSimethiconeHepatic ArteryVertebral ArteryTomography, X-Ray ComputedPhenylephrineRadial ArteryMyographyCoronary VesselsBlood PressureAcetylcholineMammary ArteriesCarotid Artery, InternalAngiographySubclavian ArteryNitric OxideStomatognathic DiseasesEquidaeDose-Response Relationship, DrugIschemic Attack, TransientMyocardial Reperfusion InjuryDuodenostomyDisease Models, AnimalHorsesArterial Occlusive DiseasesDogsRats, Inbred WKYRegional Blood FlowCarotid Artery DiseasesMuscle ContractionMuscle RelaxationBrachial ArteryTreatment OutcomeInfarction, Middle Cerebral ArteryReperfusionRabbitsCarotid Artery, CommonSuperior ColliculiRats, Inbred SHRUrolithiasisVena Cava, Superior