Basilar ArteryPonsArteriesVertebrobasilar InsufficiencyVertebral ArteryCerebral ArteriesBrain Stem InfarctionsPulmonary ArteryCarotid ArteriesSubarachnoid HemorrhageCerebral AngiographyVasospasm, IntracranialMesenteric ArteriesRenal ArteryFemoral ArteryVasodilationVasoconstrictionCarotid Artery, InternalBrain StemIntracranial AneurysmMuscle, Smooth, VascularIliac ArteryCoronary Artery BypassCerebrovascular CirculationRadial ArteryArterial Occlusive DiseasesMammary ArteriesDogsVasodilator AgentsMagnetic Resonance AngiographyCarotid Artery DiseasesSerotoninSubclavian ArteryTomography, X-Ray ComputedMiddle Cerebral ArterySplenic ArteryBrachial ArteryPotassium ChlorideCell DivisionPapaverineCircle of WillisCoronary VesselsMagnetic Resonance ImagingMuscle ContractionBrainHepatic ArteryVasoconstrictor AgentsCarotid Artery, CommonPicolinesRabbitsTime FactorsSumatriptanCerebral InfarctionAcetylcholineTreatment OutcomeEndothelium, VascularAngiography, Digital SubtractionUltrasonography, Doppler, TranscranialCeliac ArteryIschemic Attack, TransientIntracranial ArteriosclerosisAneurysm, RupturedOphthalmic ArteryMesenteric Artery, SuperiorEmbolization, TherapeuticIntracranial Embolism and ThrombosisAngiographyUmbilical ArteriesRenal Artery ObstructionRats, Sprague-DawleyThoracic ArteriesVasomotor SystemTemporal ArteriesBronchial ArteriesDose-Response Relationship, DrugNitroprussidePosterior Cerebral ArteryPopliteal ArteryMuscle RelaxationUlnar ArteryNitroglycerinSubclavian Steal SyndromeRegional Blood FlowCerebellumStentsInfusions, Intra-ArterialUterine ArteryThrombolytic TherapySpasmConstriction, PathologicNorepinephrineIntracranial ThrombosisCerebrovascular DisordersBrain IschemiaCoronary AngiographyInjections, Intra-ArterialComaCarotid Artery, External15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidDisease Models, Animal