Middle Cerebral ArteryInfarction, Middle Cerebral ArteryCerebral ArteriesStrokeBrain IschemiaCerebral InfarctionCerebrovascular CirculationCerebral Arterial DiseasesUltrasonography, Doppler, TranscranialIschemic Attack, TransientCerebral AngiographyArterial Occlusive DiseasesAnterior Cerebral ArteryBrainArteriesBlood Flow VelocityPosterior Cerebral ArteryReperfusionBrain EdemaCerebrovascular DisordersIntracranial Embolism and ThrombosisNeuroprotective AgentsBasilar ArteryCarotid Artery, InternalBrain InfarctionCerebral HemorrhageIntracranial AneurysmDisease Models, AnimalTomography, X-Ray ComputedTime FactorsMagnetic Resonance AngiographyCarotid ArteriesCerebral RevascularizationRats, Sprague-DawleyMagnetic Resonance ImagingTemporal ArteriesSubarachnoid HemorrhageIntracranial EmbolismInfarction, Anterior Cerebral ArteryReperfusion InjuryTissue Plasminogen ActivatorUmbilical ArteriesConstrictionRats, WistarTreatment OutcomeBlood PressureCerebral CortexFibrinolytic AgentsAneurysm, RupturedPulmonary ArteryNeurologic ExaminationCarotid Artery DiseasesIntracranial ThrombosisCircle of WillisUltrasonography, DopplerAcute DiseaseVertebral ArteryRegional Blood FlowCarotid StenosisCerebral VeinsIntracranial ArteriosclerosisLaser-Doppler FlowmetryCarotid Artery ThrombosisThrombolytic TherapyRecovery of FunctionPia MaterVasoconstrictionBlood-Brain BarrierCerebral PalsyProspective StudiesVasodilationEchoencephalographyCatsCarotid Artery, ExternalAngiography, Digital SubtractionFemoral ArteryRenal ArteryMesenteric ArteriesHemiplegiaPulsatile FlowCraniotomyCollateral CirculationRats, Inbred SHREar, MiddleCarbon DioxideMoyamoya DiseaseInfarction, Posterior Cerebral ArteryHypocapniaInjections, Intra-ArterialUltrasonography, PrenatalVasospasm, IntracranialPredictive Value of TestsFollow-Up StudiesIntracranial PressureHemodynamicsMuscle, Smooth, VascularRisk FactorsConstriction, PathologicNeuronsCarotid Artery, Common