Regional Blood FlowForearmPlethysmographyBlood Flow VelocityMicrospheresVascular ResistanceHemodynamicsBlood CirculationCerebrovascular CirculationCardiac OutputBlood PressureDogsCoronary CirculationSplanchnic CirculationScandiumVasodilationRenal CirculationLaser-Doppler FlowmetryHeart RateLiver CirculationVasodilator AgentsVeinsPulmonary CirculationLegXenon RadioisotopesVascular CapacitanceAnesthesiaNitroprussideVasoconstrictionOxygenomega-N-MethylarginineOxygen ConsumptionIschemiaRetinal Vein OcclusionHyperemiaMicrocirculationBlood Gas AnalysisBlood VolumeTime FactorsRadioisotopesSupine PositionConstrictionNafronylTomography, Emission-ComputedNitrogen RadioisotopesBrainNitric OxideCollateral CirculationPhentolamineOxygen RadioisotopesCapillary ResistanceSwineVentilation-Perfusion RatioKidneyInfusions, Intra-ArterialIliac ArteryHindlimbCarbon DioxideOrganotechnetium CompoundsSympathetic Nervous SystemVenous PressurePartial PressureMuscle, SkeletalCoronary OcclusionRenal ArteryModels, CardiovascularNorepinephrineNitric Oxide SynthaseFibrinolysisImmersionEndothelium, VascularDose-Response Relationship, DrugArteriesBalloon OcclusionHeartMyocardiumPulmonary Gas ExchangePlethysmography, ImpedanceAnesthesia, InhalationAcetylcholineBrachial ArteryNG-Nitroarginine Methyl EsterRetinal Artery OcclusionArterial Occlusive DiseasesMesenteric Vascular OcclusionIsofluraneCatsRats, Sprague-DawleyReference ValuesInfusions, ParenteralDisease Models, AnimalMesenteric ArteriesCoronary VesselsEnzyme InhibitorsTomography, Emission-Computed, Single-PhotonRats, WistarConstriction, PathologicFlow CytometryPropranololVasomotor System