Oxygen ConsumptionCoronary CirculationMyocardiumDogsOxygenRegional Blood FlowNitrogen RadioisotopesHemodynamicsHeartTomography, Emission-ComputedBlood Flow VelocityCoronary VesselsHyperemiaHeart RateMyocardial ContractionOxygen RadioisotopesDobutamineBlood PressureVascular ResistanceDipyridamoleCardiac OutputMicrospheresAdenosineMyocardial StunningEnergy MetabolismCoronary DiseaseMyocardial IschemiaAmmoniaVentricular Function, LeftCardiotonic AgentsPhysical ExertionLactatesLactic AcidVasodilator AgentsCarbon RadioisotopesVentricular FunctionVasodilationMyocardial ReperfusionPerfusionStrontium RadioisotopesHeart VentriclesCardiac Pacing, ArtificialCerium RadioisotopesEndocardiumSwinePrenylamineModels, CardiovascularPositron-Emission TomographyCollateral CirculationEchocardiographyIsothiuroniumTime FactorsCarbon DioxidePropranololAcetatesMyocardial Perfusion ImagingRestStroke VolumeCardiomyopathy, DilatedNitric OxidePhosphocreatineNitroglycerinGlucoseMicrocirculationBlood VolumeAnesthesiaMyocardial Reperfusion InjuryNorepinephrineAdrenergic beta-AntagonistsHalothaneCerebrovascular CirculationDiatrizoate MeglumineExercise TestSystoleOrganotechnetium CompoundsExtracorporeal CirculationVasomotor SystemMyocardial InfarctionHeart FailureReactive Oxygen SpeciesAngina PectorisElectrocardiographyIsoproterenolHeart Arrest, InducedVeratrineYtterbiumPartial PressureIsofluraneAdenosine TriphosphateCalcium ChlorideDose-Response Relationship, DrugVentricular Dysfunction, LeftDiatrizoateScandiumMitochondria, HeartDiastoleSpectrometry, GammaRubidium RadioisotopesVentricular PressureRadiopharmaceuticals