Basilar ArteryEndothelium, VascularMuscle RelaxationBlood-Brain BarrierVasodilationBrainVasodilator AgentsArteriesAcetylcholineCerebral ArteriesNitroglycerinNitroprussideVasoconstrictionNitric OxideVertebrobasilar InsufficiencyVasoconstrictor AgentsEndotheliumMuscle, Smooth, VascularBrachial ArteryRegional Blood FlowNitric Oxide SynthaseDose-Response Relationship, DrugVertebral ArteryCerebral AngiographyCerebrovascular CirculationCerebral InfarctionMiddle Cerebral ArteryPulmonary ArterySubarachnoid HemorrhageMesenteric ArteriesCarotid ArteriesVasospasm, IntracranialBrain Stem InfarctionsEndothelium, CornealRenal ArteryFemoral ArteryCerebral PalsyMuscle ContractionIntracranial AneurysmDogsRabbitsInfarction, Middle Cerebral ArteryBrain IschemiaPotassium ChlorideCoronary VesselsTime FactorsNitroarginineSerotoninRats, Sprague-DawleyArterial Occlusive DiseasesCarotid Artery, InternalIschemic Attack, TransientMagnetic Resonance AngiographyIliac ArteryRelaxationMammary ArteriesRelaxation TherapyAorta, ThoracicTomography, X-Ray ComputedCoronary Artery BypassEnzyme InhibitorsPapaverineCarotid Artery DiseasesRadial ArteryMagnetic Resonance ImagingCalciumMalaria, CerebralBiological FactorsIntracranial Embolism and ThrombosisPosterior Cerebral ArteryCells, CulturedCerebral VeinsNG-Nitroarginine Methyl EsterVasomotor SystemRats, WistarCircle of WillisCerebral HemorrhageDisease Models, AnimalIndomethacin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidBlood PressureSubclavian ArteryNorepinephrineAortaSwineBradykininBlood Flow VelocityArginineCarotid Artery, CommonTreatment OutcomeCerebrovascular DisordersPicolinesMesenteric Artery, SuperiorAneurysm, RupturedSumatriptanAngiography, Digital SubtractionRats, Inbred WKYSplenic ArteryNitric Oxide Synthase Type IIICyclic GMP