Regional Blood FlowCoronary VesselsCoronary CirculationBlood Flow VelocityMicrospheresCoronary AngiographyHemodynamicsCoronary Artery DiseaseCardiac OutputDogsCerebrovascular CirculationVascular ResistanceBlood CirculationBlood PressureSplanchnic CirculationScandiumAngioplasty, Balloon, CoronaryRenal CirculationLiver CirculationCoronary StenosisCoronary DiseaseCoronary Artery BypassPulmonary CirculationLaser-Doppler FlowmetryXenon RadioisotopesHeart RateAnesthesiaOxygenOxygen ConsumptionRadioisotopesBlood Gas AnalysisNitrogen RadioisotopesSwineTomography, Emission-ComputedTime FactorsMyocardial InfarctionVasodilator AgentsNafronylVasodilationMicrocirculationPhentolamineCoronary VasospasmVasoconstrictionHeartOxygen RadioisotopesVentilation-Perfusion RatioCollateral CirculationMyocardiumKidneyModels, CardiovascularBrainOrganotechnetium CompoundsCoronary AneurysmCarbon DioxideHindlimbCoronary ThrombosisPartial PressureBlood VolumeIschemiaIliac ArteryImmersionRenal ArteryNitric OxideTomography, Emission-Computed, Single-PhotonNG-Nitroarginine Methyl EsterPulmonary Gas ExchangeSupine PositionAnesthesia, InhalationIsofluraneCoronary RestenosisCoronary OcclusionLegInfusions, ParenteralPropranololMesenteric ArteriesRats, Sprague-DawleyFlow CytometryCatsSympathetic Nervous SystemDose-Response Relationship, DrugPercutaneous Coronary InterventionForearmArteriesNorepinephrineMyocardial ContractionSheepNitric Oxide SynthaseDisease Models, AnimalMuscle, SkeletalRats, WistarInjections, IntravenousRabbitsReference ValuesPulsatile FlowRisk FactorsMagnetic Resonance ImagingRats, Inbred StrainsCoronary Care UnitsTreatment OutcomeProspective Studies