ColicMesenteric ArteriesMesenteric Artery, SuperiorRenal ColicArteriesMesenteric Artery, InferiorPulmonary ArteryRenal ArteryCarotid ArteriesCerebral ArteriesFemoral ArteryCeliac ArteryBasilar ArteryMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeIliac ArteryVertebral ArteryCoronary Artery BypassVasodilationMuscle, Smooth, VascularVasoconstrictionSplenic ArteryRadial ArteryMammary ArteriesCarotid Artery, InternalHepatic ArteryFecal ImpactionSubclavian ArteryCarotid Artery DiseasesSplanchnic CirculationVasodilator AgentsHorse DiseasesVasoconstrictor AgentsBrachial ArteryEndothelium, VascularCoronary VesselsBiological FactorsCarotid Artery, CommonMesenteric VeinsTomography, X-Ray ComputedOphthalmic ArteryNorepinephrineRenal Artery ObstructionUreteral DiseasesAngiographyUmbilical ArteriesMiddle Cerebral ArteryTreatment OutcomeThoracic ArteriesAcetylcholinePhenylephrineMyographyTemporal ArteriesRats, WistarSimethiconeTime FactorsBronchial ArteriesBlood PressurePopliteal ArteryArterial Occlusive DiseasesUlnar ArteryAneurysmRats, Sprague-DawleyNitric OxideUterine ArteryMuscle RelaxationMuscle ContractionDose-Response Relationship, DrugCoronary AngiographyRats, Inbred WKYStentsRegional Blood FlowCarotid Artery, ExternalStomatognathic DiseasesEquidaeDuodenostomyHorsesCarotid Artery InjuriesDogsConstriction, PathologicUltrasonography, DopplerCoronary Disease15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidPotassium ChlorideRats, Inbred SHRVena Cava, SuperiorRabbitsProspective StudiesFollow-Up StudiesRetrospective StudiesInfarction, Middle Cerebral ArteryAxillary ArterySuperior ColliculiNG-Nitroarginine Methyl EsterUrolithiasis