Regional Blood FlowMicrospheresBlood Flow VelocityCerebrovascular CirculationCardiac OutputHemodynamicsBlood CirculationVascular ResistanceDogsCoronary CirculationSplanchnic CirculationXenon RadioisotopesBlood PressureScandiumRenal CirculationLiver CirculationLaser-Doppler FlowmetryPulmonary CirculationHeart RateOxygen RadioisotopesAnesthesiaOxygenBrainBlood Gas AnalysisOrganotechnetium CompoundsRadioisotopesOxygen ConsumptionNafronylNitrogen RadioisotopesTomography, Emission-ComputedTomography, Emission-Computed, Single-PhotonPhentolamineVentilation-Perfusion RatioCarbon DioxideKidneyBlood VolumeSwineHindlimbMicrocirculationPartial PressureModels, CardiovascularImmersionVasoconstrictionIliac ArteryVasodilationRenal ArteryIschemiaVasodilator AgentsTime FactorsPulmonary Gas ExchangeSupine PositionAnesthesia, InhalationCollateral CirculationNG-Nitroarginine Methyl EsterIsofluraneHeartTechnetium Tc 99m ExametazimeMyocardiumLegInfusions, ParenteralCatsNitric OxideMesenteric ArteriesRats, Sprague-DawleyFlow CytometryMagnetic Resonance ImagingPropranololForearmSympathetic Nervous SystemMuscle, SkeletalSheepReference ValuesNorepinephrineRats, Inbred StrainsRats, WistarInjections, IntravenousNitric Oxide SynthaseDose-Response Relationship, DrugPulsatile FlowRabbitsCoronary VesselsDisease Models, AnimalXenonArteriesLungMyocardial ContractionIofetamineCapillariesBlood DonorsCerebral ArteriesEnzyme InhibitorsMyocardial InfarctionHyperemiaCoronary DiseaseRheologyAmphetaminesAcetazolamideAnoxiaUltrasonography, DopplerContrast Media