DobutamineDopamineReceptors, Dopamine D2Receptors, Dopamine D1Cardiotonic AgentsDopamine AgonistsDopamine AntagonistsReceptors, DopamineReceptors, Dopamine D3Echocardiography, StressDopamine Plasma Membrane Transport ProteinsDopamine AgentsReceptors, Dopamine D5Myocardial ContractionDopamine Uptake InhibitorsEchocardiographyDopamine beta-HydroxylaseAdrenergic beta-AgonistsAdrenergic beta-1 Receptor AgonistsExercise TestMyocardial StunningCorpus StriatumVentricular Function, LeftHemodynamicsHydrazonesMyocardial IschemiaBenzazepinesVentricular Dysfunction, LeftQuinpiroleCoronary DiseaseTomography, Emission-Computed, Single-PhotonCoronary CirculationHeartRacloprideTissue SurvivalNucleus AccumbensThallium RadioisotopesCatecholaminesMilrinoneTechnetium Tc 99m SestamibiAmrinoneSulpirideCoronary AngiographyHeart RateSensitivity and SpecificityHaloperidolApomorphineSalicylamidesCocaineNeostriatumDose-Response Relationship, DrugPredictive Value of TestsDipyridamoleLevodopaStroke VolumeAmphetamineDopaminergic NeuronsHomovanillic AcidPyridazinesTyrosine 3-MonooxygenaseDogsEnoximoneSympathomimeticsDopamine and cAMP-Regulated Phosphoprotein 32ElectrocardiographyMicrodialysisSpiperoneRats, Sprague-DawleySubstantia NigraVentral Tegmental AreaMyocardiumMyocardial RevascularizationOxidopamineErgolinesMesencephalonMagnetic Resonance Imaging, CineAtropineCardiac OutputTomography, Emission-ComputedSystoleMyocardial InfarctionCaudate NucleusBlood PressureTime FactorsPropanolaminesRadiopharmaceuticalsalpha-MethyltyrosineBehavior, AnimalFeasibility StudiesDomperidoneOxygen ConsumptionAdrenergic beta-AntagonistsNorepinephrineNeuronsDihydroxyphenylalanineNomifensineFlupenthixolReceptors, Adrenergic, betaMotor ActivityObserver Variation