Regional Blood FlowBlood Flow VelocityHemodynamicsCardiac OutputMicrospheresDogsVascular ResistanceBlood PressureBlood CirculationCoronary CirculationCerebrovascular CirculationHeart RateSplanchnic CirculationAortaPulmonary CirculationScandiumRenal CirculationLiver CirculationOxygenLaser-Doppler FlowmetryXenon RadioisotopesHeartAnesthesiaSwineBlood Gas AnalysisRadioisotopesNafronylOxygen ConsumptionNitrogen RadioisotopesTomography, Emission-ComputedPropranololPulsatile FlowPhentolamineVentilation-Perfusion RatioOxygen RadioisotopesAorta, ThoracicKidneyBrainMyocardial ContractionSplanchnic NervesNorepinephrineHindlimbCarbon DioxideMicrocirculationOrganotechnetium CompoundsImmersionVasoconstrictionPartial PressureModels, CardiovascularIliac ArteryBlood VolumeRenal ArteryIschemiaVasodilationDose-Response Relationship, DrugPulmonary Gas ExchangeVasodilator AgentsSupine PositionAnesthesia, InhalationTime FactorsNG-Nitroarginine Methyl EsterUltrasonographyCollateral CirculationMyocardiumIsofluraneLegAorta, AbdominalInfusions, ParenteralNitric OxideMesenteric ArteriesCatsFlow CytometryRats, Sprague-DawleyTomography, Emission-Computed, Single-PhotonForearmSympathetic Nervous SystemMuscle, SkeletalSheepPhysical ExertionRats, WistarRats, Inbred StrainsInjections, IntravenousDiastoleNitric Oxide SynthaseRabbitsStroke VolumeCoronary VesselsDisease Models, AnimalMagnetic Resonance ImagingReference ValuesEpinephrineVentricular Function, LeftArteriesLungCapillariesHypertensionBlood DonorsEnzyme InhibitorsHeart VentriclesMyocardial Infarction