VasodilationBrachial ArteryVasodilator AgentsArteriesPulmonary ArteryMesenteric ArteriesCerebral ArteriesCarotid ArteriesRenal ArteryFemoral ArteryBasilar ArteryEndothelium, VascularCoronary VesselsRegional Blood FlowNitric OxideForearmNitroprussideRadial ArteryIliac ArteryAcetylcholineArteriolesVertebral ArteryCoronary Artery BypassMammary ArteriesVasoconstrictionCarotid Artery, InternalSubclavian ArteryCoronary CirculationNitroglycerinCarotid Artery DiseasesBlood PressureHyperemiaSplenic Arteryomega-N-MethylarginineCarotid Artery, CommonHepatic ArteryMuscle, Smooth, VascularHemodynamicsNitric Oxide SynthaseMesenteric Artery, SuperiorVascular ResistanceBronchial ArteriesVasoconstrictor AgentsDogsNG-Nitroarginine Methyl EsterCeliac ArteryCandicidinMiddle Cerebral ArteryOphthalmic ArteryUterine ArteryUmbilical ArteriesRenal Artery ObstructionLaser-Doppler FlowmetryEnzyme InhibitorsThoracic ArteriesDose-Response Relationship, DrugMicrocirculationAdenosineTemporal ArteriesCoronary AngiographyBiological FactorsNitric Oxide Synthase Type IIIMeningeal ArteriesPopliteal ArteryUlnar ArteryNitroarginineBradykininRats, Sprague-DawleyTime FactorsBlood Flow VelocityIndomethacinCoronary DiseaseInfusions, Intra-ArterialPia MaterCerebrovascular CirculationCarotid Artery, ExternalArterial Occlusive DiseasesPulmonary CirculationAngiographyEndothelium-Dependent Relaxing FactorsSwineArginineCarotid Artery InjuriesPlethysmographyAxillary ArteryHeart RateCyclooxygenase InhibitorsMyographyNorepinephrineTreatment Outcome15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidPapaverineAnoxiaInfarction, Middle Cerebral ArteryRats, WistarAorta, ThoracicNitric Oxide DonorsPhenylephrineHypertensionRetinal Artery Occlusion