Middle Cerebral ArteryInfarction, Middle Cerebral ArteryCerebral ArteriesBrain IschemiaCerebral InfarctionCerebrovascular CirculationIschemic Attack, TransientCerebral Arterial DiseasesBrainIschemiaCerebral AngiographyReperfusionNeuroprotective AgentsUltrasonography, Doppler, TranscranialArterial Occlusive DiseasesBrain EdemaBlood Flow VelocityAnterior Cerebral ArteryArteriesDisease Models, AnimalRats, Inbred SHRStrokeIntracranial Embolism and ThrombosisReperfusion InjuryPosterior Cerebral ArteryTime FactorsMyocardial InfarctionBlood PressureRats, Sprague-DawleyHypertensionCerebrovascular DisordersInfarctionBrain InfarctionRats, WistarBasilar ArteryMyocardial IschemiaCerebral HemorrhageSubarachnoid HemorrhageTomography, X-Ray ComputedIntracranial AneurysmMagnetic Resonance ImagingCarotid Artery, InternalCarotid ArteriesCerebral PalsyRats, Inbred WKYMagnetic Resonance AngiographyCerebral RevascularizationConstrictionCerebral CortexCerebral VeinsTreatment OutcomeRegional Blood FlowTemporal ArteriesBlood-Brain BarrierNeurologic ExaminationInfarction, Anterior Cerebral ArteryLaser-Doppler FlowmetryGerbillinaeTissue Plasminogen ActivatorNeuronsAcute DiseaseIntracranial EmbolismPia MaterCircle of WillisHemodynamicsThrombolytic TherapyVasoconstrictionVasospasm, IntracranialFibrinolytic AgentsProspective StudiesCarotid Artery DiseasesIntracranial ThrombosisAneurysm, RupturedCatsUmbilical ArteriesPulmonary ArteryIntracranial PressureCarotid StenosisOxygenVasodilationVertebral ArteryCarbon DioxideCollateral CirculationMalaria, CerebralUltrasonography, DopplerMesenteric ArteriesNimodipineIschemic PreconditioningCarotid Artery ThrombosisPredictive Value of TestsRecovery of FunctionHypoxia, BrainHypothermia, InducedRats, Inbred StrainsRisk FactorsIntracranial ArteriosclerosisRenal ArteryDose-Response Relationship, DrugMicrocirculationPapio