Regional Blood FlowCoronary CirculationBlood Flow VelocityCoronary VesselsDogsHemodynamicsMicrospheresVascular ResistanceCoronary AngiographyBlood PressureCerebrovascular CirculationCardiac OutputCoronary Artery DiseaseHeart RateVasodilationOxygen ConsumptionAdenosineVasodilator AgentsCoronary DiseaseLaser-Doppler FlowmetryBlood CirculationMyocardiumSplanchnic CirculationHeartCoronary StenosisHyperemiaAngioplasty, Balloon, CoronaryMicrocirculationRenal CirculationOxygenSwineScandiumLiver CirculationAnesthesiaPapaverineVasoconstrictionXenon RadioisotopesPulmonary CirculationNitric OxideMyocardial ContractionTime FactorsCollateral CirculationRadioisotopesCoronary Artery BypassModels, CardiovascularMyocardial InfarctionPropranololTomography, Emission-ComputedNitroglycerinMyocardial IschemiaPhentolamineNG-Nitroarginine Methyl EsterBlood VolumeIsofluraneKryptonCarbon DioxideBretylium TosylatePartial PressureBlood Gas AnalysisAcetylcholineEndothelium, VascularNitrogen RadioisotopesCoronary VasospasmOxygen RadioisotopesVasomotor SystemFlow CytometryBrainDose-Response Relationship, DrugCoronary ThrombosisArteriesTomography, Emission-Computed, Single-PhotonPerfusionNitric Oxide SynthaseUltrasonography, DopplerNafronylKidneyDipyridamoleHindlimbOrganotechnetium CompoundsEchocardiographySympathetic Nervous SystemPulsatile FlowDiastolePhysical ExertionNorepinephrineElectrocardiographyVentilation-Perfusion RatioVentricular Function, LeftIschemiaDisease Models, AnimalPurinergic P1 Receptor AntagonistsTheophyllineCardiac CatheterizationInjections, IntravenousEnzyme InhibitorsMyocardial Stunningomega-N-MethylarginineAdrenergic beta-AntagonistsReference ValuesCoronary Aneurysm