InfarctionBrain Stem InfarctionsBrain StemBasilar ArteryArteriesVertebrobasilar InsufficiencyMyocardial InfarctionCerebral InfarctionStem CellsVertebral ArteryCerebral ArteriesSubarachnoid HemorrhagePulmonary ArteryCarotid ArteriesCerebral AngiographyBrain ChemistryTime FactorsVasospasm, IntracranialMagnetic Resonance ImagingBrainMesenteric ArteriesFemoral ArteryRenal ArteryBrain InjuriesBrain NeoplasmsTreatment OutcomeVasodilationPonsBrain IschemiaCoronary Artery BypassCerebrovascular CirculationTomography, X-Ray ComputedCarotid Artery, InternalIntracranial AneurysmVasoconstrictionBrain Stem NeoplasmsThrombolytic TherapyDogsMagnetic Resonance AngiographyCoronary AngiographyBrain MappingSerotoninEvoked Potentials, Auditory, Brain StemMuscle, Smooth, VascularCoronary VesselsArterial Occlusive DiseasesStem Cell TransplantationIliac ArteryVasodilator AgentsElectrocardiographyRadial ArteryPlant StemsDisease Models, AnimalCarotid Artery DiseasesProspective StudiesHematopoietic Stem CellsMammary ArteriesAngioplasty, Balloon, CoronaryRisk FactorsIschemic Attack, TransientRats, Sprague-DawleySubclavian ArteryMiddle Cerebral ArteryIntracranial Embolism and ThrombosisCerebrovascular DisordersRabbitsBrain EdemaStentsFibrinolytic AgentsRetrospective StudiesAdult Stem CellsInfarction, Middle Cerebral ArteryStrokeNeuronsCoronary DiseaseDose-Response Relationship, DrugNeoplastic Stem CellsSplenic ArteryCircle of WillisBrachial ArteryEndothelium, VascularMuscle ContractionCarotid Artery, CommonPotassium ChlorideAcetylcholineAcute DiseaseIntracranial ArteriosclerosisVasoconstrictor AgentsPapaverineHepatic ArteryCerebellumPredictive Value of TestsBlood PressureUltrasonography, Doppler, TranscranialPicolinesAngiography, Digital SubtractionRats, WistarAngiographyComaMedulla Oblongata