DobutamineIsoproterenolCardiotonic AgentsAdrenergic beta-AgonistsEchocardiography, StressReceptors, Adrenergic, betaMyocardial ContractionAdrenergic beta-1 Receptor AgonistsEchocardiographyExercise TestMyocardial StunningVentricular Function, LeftSympathomimeticsHemodynamicsMyocardiumMyocardial IschemiaVentricular Dysfunction, LeftHeart RatePropranololHydrazonesAdrenergic beta-AntagonistsCoronary DiseaseCoronary CirculationDogsCatecholaminesCyclic AMPPropanolaminesReceptors, AdrenergicReceptors, Adrenergic, beta-1HeartAdrenergic AgonistsTissue SurvivalMilrinoneThallium RadioisotopesTomography, Emission-Computed, Single-PhotonAdenylate CyclaseElectrocardiographyColforsinTechnetium Tc 99m SestamibiAmrinoneSensitivity and SpecificityCoronary AngiographyEnoximoneDipyridamoleReceptors, Adrenergic, beta-2Stroke VolumeAtropinePyridazinesPredictive Value of TestsHeart VentriclesDose-Response Relationship, DrugBlood PressureEpinephrineNorepinephrineParotid GlandStimulation, ChemicalCardiac OutputDihydroalprenololVentricular FunctionVasodilator AgentsMyocardial InfarctionMyocardial RevascularizationMagnetic Resonance Imaging, CineSystolePhenylephrineOxygen ConsumptionPindololAdenosineBucladesineIodocyanopindololHeart FailureCardiomyopathy, DilatedTime FactorsFeasibility StudiesCyclic AMP-Dependent Protein KinasesAlprenololDiastoleAdrenergic alpha-AgonistsVentricular PressureAdrenergic beta-2 Receptor AntagonistsObserver VariationMyocytes, CardiacInfusions, IntravenousCalcium8-Bromo Cyclic Adenosine MonophosphateReceptors, Adrenergic, beta-3MetoprololProspective StudiesEchocardiography, DopplerMethoxamineRadionuclide VentriculographyHistory, Early Modern 1451-1600Tomography, Emission-ComputedSwineRadiopharmaceuticalsAdrenergic beta-1 Receptor AntagonistsLipolysis1-Methyl-3-isobutylxanthinePapillary MusclesCardiomegaly