Mesenteric Artery, InferiorColicMesenteric ArteriesArteriesMesenteric Artery, SuperiorAdrenal GlandsRenal ColicUltrasonography, Doppler, PulsedPulmonary ArteryRenal ArteryCarotid ArteriesCerebral ArteriesFemoral ArteryBasilar ArteryFetal Growth RetardationCeliac ArteryAdrenal CortexIliac ArteryVertebral ArteryCoronary Artery BypassAdrenal MedullaUltrasonography, PrenatalRadial ArteryMammary ArteriesSplenic ArteryMesenteric Vascular OcclusionCarotid Artery, InternalAdrenal Gland NeoplasmsSubclavian ArteryVasodilationHepatic ArteryMuscle, Smooth, VascularVena Cava, InferiorGestational AgeVasoconstrictionSuperior Mesenteric Artery SyndromeCarotid Artery DiseasesAdrenal Gland DiseasesBrachial ArteryBlood Flow VelocityCoronary VesselsCarotid Artery, CommonAdrenal InsufficiencyVasodilator AgentsTomography, X-Ray ComputedOphthalmic ArteryEndothelium, VascularVasoconstrictor AgentsInferior ColliculiRenal Artery ObstructionUmbilical ArteriesMiddle Cerebral ArteryFecal ImpactionThoracic ArteriesTreatment OutcomeSplanchnic CirculationAngiographyTemporal ArteriesTime FactorsBiological FactorsBronchial ArteriesHorse DiseasesNorepinephrinePopliteal ArteryMesenteric VeinsUlnar ArteryArterial Occlusive DiseasesUterine ArteryCoronary AngiographyBlood PressureAdrenal Cortex NeoplasmsAcetylcholineCarotid Artery, ExternalRats, WistarAneurysmStentsRats, Sprague-DawleyRegional Blood FlowCarotid Artery InjuriesPhenylephrineMyographyUreteral DiseasesDose-Response Relationship, DrugDogsCoronary DiseaseNitric OxideConstriction, PathologicAdrenal Hyperplasia, CongenitalMuscle ContractionFollow-Up StudiesMuscle RelaxationRetrospective StudiesInfarction, Middle Cerebral ArteryAxillary ArteryProspective StudiesUltrasonography, DopplerRetinal Artery OcclusionRats, Inbred WKYSimethiconeMeningeal Arteries