Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Vascular OcclusionMesenteric Artery, InferiorRetinal Artery OcclusionArteriesArterial Occlusive DiseasesEmbolectomyCollateral CirculationAngioplasty, BalloonCerebral AngiographyCoronary VesselsAcute DiseaseCeliac ArteryTreatment OutcomeSuperior Mesenteric Artery SyndromeThrombolytic TherapyStentsCoronary DiseaseCerebral ArteriesPulmonary ArteryCoronary AngiographyRenal ArteryFemoral ArteryCarotid ArteriesVasodilationMuscle, Smooth, VascularVasoconstrictionBasilar ArterySplanchnic CirculationRetrospective StudiesIliac ArteryCoronary OcclusionMesenteric VeinsCarotid Artery, InternalVasodilator AgentsBiological FactorsVasoconstrictor AgentsBalloon OcclusionVertebral ArteryEndothelium, VascularSplenic ArteryRetinal Vein OcclusionCoronary Artery BypassRats, WistarHepatic ArteryCarotid Artery DiseasesAngiographyNorepinephrineTomography, X-Ray ComputedTime FactorsRadial ArteryPhenylephrineRats, Sprague-DawleyInfarction, Middle Cerebral ArterySubclavian ArteryMammary ArteriesAcetylcholineMyographyBlood PressureDogsRegional Blood FlowDuodenostomyConstriction, PathologicRats, Inbred WKYBrachial ArteryNitric OxideMuscle ContractionDose-Response Relationship, DrugEmbolization, TherapeuticCarotid Artery, CommonMuscle RelaxationMiddle Cerebral ArteryVena Cava, SuperiorAneurysmDental OcclusionBrain IschemiaSuperior ColliculiOphthalmic ArteryConstrictionRats, Inbred SHRRenal Artery ObstructionEndothelium-Dependent Relaxing FactorsIschemiaDisease Models, AnimalPopliteal ArteryRabbitsReperfusion InjuryHemodynamicsVascular PatencyLigationNG-Nitroarginine Methyl EsterCarotid Artery, ExternalCarotid Artery ThrombosisPotassium ChlorideUltrasonography, Doppler15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidMagnetic Resonance AngiographyCerebrovascular CirculationCharybdotoxin