DobutamineCardiotonic AgentsEchocardiography, StressMyocardial ContractionMyocytes, CardiacHeartCardiac OutputEchocardiographyAdrenergic beta-AgonistsVentricular Function, LeftExercise TestHemodynamicsMyocardial StunningAdrenergic beta-1 Receptor AgonistsMyocardial IschemiaVentricular Dysfunction, LeftArrhythmias, CardiacCardiac Surgical ProceduresMyocardiumCoronary DiseaseHeart RateHydrazonesCoronary CirculationDeath, Sudden, CardiacElectrocardiographyStroke VolumeTomography, Emission-Computed, Single-PhotonCoronary AngiographyCardiac CatheterizationThallium RadioisotopesPredictive Value of TestsMyocardial InfarctionTissue SurvivalCardiac Pacing, ArtificialDogsSensitivity and SpecificityHeart VentriclesAmrinoneMilrinoneTechnetium Tc 99m SestamibiHeart FailureHeart DiseasesDipyridamoleBlood PressureMagnetic Resonance Imaging, CineCardiac VolumeCardiomegalyPyridazinesCardiomyopathy, DilatedCardiac Output, LowCardiomyopathiesProspective StudiesCardiac TamponadeSystoleTime FactorsEnoximoneMyocardial RevascularizationOxygen ConsumptionHeart Function TestsAdrenergic beta-AntagonistsCatecholaminesSympathomimeticsVentricular FunctionReceptors, Adrenergic, betaAtropineDiastoleFeasibility StudiesHeart ArrestEchocardiography, DopplerPropanolaminesVentricular RemodelingFollow-Up StudiesVentricular PressureHeart TransplantationPrognosisTreatment OutcomeVasodilator AgentsObserver VariationDose-Response Relationship, DrugMyoblasts, CardiacCoronary Artery BypassRadiopharmaceuticalsRadionuclide VentriculographyEchocardiography, TransesophagealCoronary Artery DiseaseCardiac MyosinsCardiac Imaging TechniquesInfusions, IntravenousReproducibility of ResultsIsoproterenolCardiac GlycosidesReceptors, Adrenergic, beta-1Tomography, Emission-ComputedCoronary StenosisOut-of-Hospital Cardiac ArrestHistory, Early Modern 1451-1600Coronary VesselsAdrenergic AgonistsCardiopulmonary BypassHypertrophy, Left Ventricular