Regional Blood FlowCerebrovascular CirculationBlood Flow VelocityMicrospheresXenon RadioisotopesTomography, Emission-ComputedBrainHemodynamicsCardiac OutputVascular ResistanceDogsBlood CirculationCerebral ArteriesBlood PressureCoronary CirculationSplanchnic CirculationOxygen RadioisotopesTechnetium Tc 99m ExametazimeTomography, Emission-Computed, Single-PhotonScandiumOrganotechnetium CompoundsRenal CirculationCerebral InfarctionLaser-Doppler FlowmetryLiver CirculationOxygenOximesBlood VolumeHeart RateXenonPulmonary CirculationCarbon DioxideIofetamineAnesthesiaOxygen ConsumptionBlood Gas AnalysisRadioisotopesBrain IschemiaMagnetic Resonance ImagingMiddle Cerebral ArteryPartial PressureAcetazolamideNafronylTime FactorsNitrogen RadioisotopesMicrocirculationCerebral PalsyPhentolamineCerebrovascular DisordersVentilation-Perfusion RatioVasoconstrictionReference ValuesSwineKidneyModels, CardiovascularAmphetaminesAnesthesia, InhalationVasodilator AgentsIsofluraneCatsCollateral CirculationHindlimbCerebral AngiographyRats, Sprague-DawleyInfarction, Middle Cerebral ArteryAntipyrineVasodilationIschemic Attack, TransientImmersionIschemiaRats, Inbred StrainsRenal ArteryIliac ArteryCerebral VeinsPulmonary Gas ExchangeSupine PositionDisease Models, AnimalRats, WistarNG-Nitroarginine Methyl EsterIntracranial PressureKryptonBlood Circulation TimeHeartNitric OxideInfusions, ParenteralRadiopharmaceuticalsMyocardiumLegCerebral CortexImage Processing, Computer-AssistedInjections, IntravenousDominance, CerebralDose-Response Relationship, DrugPositron-Emission TomographyMesenteric ArteriesBrain EdemaMalaria, CerebralCerebral HemorrhageAutoradiographyFlow Cytometry