Regional Blood FlowBlood Flow VelocityMicrospheresCerebrovascular CirculationCardiac OutputHemodynamicsBlood CirculationVascular ResistanceDogsCoronary CirculationSplanchnic CirculationBlood PressureScandiumCerebral ArteriesRenal CirculationLiver CirculationXenon RadioisotopesLaser-Doppler FlowmetryBrainPulmonary CirculationHeart RateOxygenAnesthesiaCerebral InfarctionBlood Gas AnalysisTomography, Emission-ComputedOxygen ConsumptionRadioisotopesNafronylMiddle Cerebral ArteryOxygen RadioisotopesNitrogen RadioisotopesCarbon DioxideCerebral PalsyPhentolamineMicrocirculationVentilation-Perfusion RatioOrganotechnetium CompoundsSwineBlood VolumeKidneyPartial PressureVasoconstrictionTime FactorsHindlimbModels, CardiovascularVasodilator AgentsImmersionIschemiaRenal ArteryIliac ArteryAnesthesia, InhalationPulmonary Gas ExchangeSupine PositionMagnetic Resonance ImagingRats, Sprague-DawleyVasodilationCollateral CirculationNG-Nitroarginine Methyl EsterBrain IschemiaCerebral AngiographyIsofluraneCatsInfarction, Middle Cerebral ArteryTomography, Emission-Computed, Single-PhotonHeartNitric OxideInfusions, ParenteralMyocardiumLegCerebral VeinsRats, WistarMesenteric ArteriesDisease Models, AnimalMalaria, CerebralFlow CytometrySheepRats, Inbred StrainsSympathetic Nervous SystemPropranololNorepinephrineMuscle, SkeletalForearmDose-Response Relationship, DrugInjections, IntravenousNitric Oxide SynthaseReference ValuesPulsatile FlowRabbitsCerebral HemorrhageCoronary VesselsArteriesCapillariesLungMyocardial ContractionIschemic Attack, TransientXenonEnzyme InhibitorsBlood Circulation TimeBlood Donors