Basilar ArteryArteriesVertebrobasilar InsufficiencyVertebral ArteryCerebral ArteriesPulmonary ArteryCarotid ArteriesSubarachnoid HemorrhageBrain Stem InfarctionsCerebral AngiographyVasospasm, IntracranialMesenteric ArteriesRenal ArteryFemoral ArteryVasodilationVasoconstrictionCarotid Artery, InternalIntracranial AneurysmMuscle, Smooth, VascularIliac ArteryCoronary Artery BypassRadial ArteryArterial Occlusive DiseasesMammary ArteriesVasodilator AgentsMagnetic Resonance AngiographyDogsCarotid Artery DiseasesSerotoninSubclavian ArteryCerebrovascular CirculationMiddle Cerebral ArteryTomography, X-Ray ComputedSplenic ArteryBrachial ArteryPotassium ChloridePapaverineCircle of WillisCoronary VesselsMuscle ContractionHepatic ArteryVasoconstrictor AgentsCarotid Artery, CommonPicolinesSumatriptanRabbitsAcetylcholineEndothelium, VascularAngiography, Digital SubtractionUltrasonography, Doppler, TranscranialCeliac ArteryIschemic Attack, TransientIntracranial ArteriosclerosisAneurysm, RupturedOphthalmic ArteryMesenteric Artery, SuperiorTreatment OutcomeEmbolization, TherapeuticIntracranial Embolism and ThrombosisAngiographyPonsUmbilical ArteriesRenal Artery ObstructionThoracic ArteriesVasomotor SystemTemporal ArteriesCerebral InfarctionBronchial ArteriesNitroprussidePosterior Cerebral ArteryPopliteal ArteryMuscle RelaxationUlnar ArteryNitroglycerinSubclavian Steal SyndromeDose-Response Relationship, DrugStentsInfusions, Intra-ArterialUterine ArteryThrombolytic TherapyBrain StemSpasmConstriction, PathologicIntracranial ThrombosisRegional Blood FlowCoronary AngiographyInjections, Intra-ArterialComaCarotid Artery, ExternalTime Factors15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidNimodipineCarotid StenosisRats, Sprague-DawleyDilatation, PathologicAneurysmBrain IschemiaRats, Inbred WKYNorepinephrineCarotid Artery Injuries