DobutamineMagnetic Resonance Imaging, CineExercise TestEchocardiography, StressCardiotonic AgentsMagnetic Resonance ImagingEchocardiographyMyocardial ContractionMyocardial IschemiaVentricular Function, LeftCoronary DiseaseVentricular Dysfunction, LeftMyocardial StunningHeartCoronary AngiographyAdrenergic beta-AgonistsAdrenergic beta-1 Receptor AgonistsSensitivity and SpecificityHemodynamicsPredictive Value of TestsTomography, Emission-Computed, Single-PhotonTissue SurvivalElectrocardiographyCoronary CirculationTechnetium Tc 99m SestamibiStroke VolumeCardiac OutputMyocytes, CardiacHeart RateThallium RadioisotopesFeasibility StudiesMyocardial InfarctionMyocardiumObserver VariationAtropineDipyridamoleProspective StudiesRadionuclide VentriculographySystoleMyocardial RevascularizationSympathomimeticsCoronary Artery DiseaseCardiomyopathy, DilatedPrognosisDeath, Sudden, CardiacCoronary StenosisEchocardiography, DopplerCardiac CatheterizationHeart VentriclesRadiopharmaceuticalsFollow-Up StudiesTakotsubo CardiomyopathyArrhythmias, CardiacCardiac Surgical ProceduresCardiac VolumeHeart DiseasesDogsBlood PressureHeart Function TestsReproducibility of ResultsHeart FailureHydrazonesDiastoleTime FactorsContrast MediaCardiomyopathiesEchocardiography, TransesophagealOrganotechnetium CompoundsMethylergonovineEchocardiography, Doppler, PulsedPropanolaminesAdrenergic beta-AntagonistsEchocardiography, Doppler, ColorVasodilator AgentsRisk AssessmentOxygen ConsumptionCardiac Pacing, ArtificialHeart TransplantationChest PainAmrinoneMilrinoneFalse Positive ReactionsMyocardial Perfusion ImagingVentricular RemodelingGated Blood-Pool ImagingBlood Flow VelocityROC CurveTransposition of Great VesselsCoronary Artery BypassTomography Scanners, X-Ray ComputedInfusions, IntravenousOrganophosphorus CompoundsAortic Valve StenosisTreatment OutcomeVentricular Outflow ObstructionRestTomography, Emission-ComputedCardiomegalyPyridazinesAngina Pectoris