DobutamineEchocardiographyEchocardiography, StressEchocardiography, TransesophagealEchocardiography, DopplerEchocardiography, Three-DimensionalCardiotonic AgentsEchocardiography, Doppler, ColorVentricular Function, LeftVentricular Dysfunction, LeftMyocardial ContractionEchocardiography, Doppler, PulsedExercise TestStroke VolumeHemodynamicsMyocardial StunningHeart VentriclesPredictive Value of TestsMyocardial IschemiaSensitivity and SpecificityCoronary CirculationMitral ValveElectrocardiographyHeartCoronary DiseaseAdrenergic beta-AgonistsSystoleObserver VariationDiastoleHeart DiseasesDipyridamoleCoronary AngiographyAdrenergic beta-1 Receptor AgonistsCardiac CatheterizationFeasibility StudiesMitral Valve InsufficiencyTomography, Emission-Computed, Single-PhotonTissue SurvivalProspective StudiesHeart AtriaMyocardial InfarctionHeart Septal Defects, AtrialMyocardiumThallium RadioisotopesContrast MediaTechnetium Tc 99m SestamibiBlood Flow VelocityHeart RateHeart Valve DiseasesHeart FailureCardiac VolumeHypertrophy, Left VentricularHydrazonesReproducibility of ResultsHeart Defects, CongenitalHeart NeoplasmsAortic ValveCardiomyopathy, DilatedCardiomyopathiesCardiac OutputAortic Valve StenosisMagnetic Resonance Imaging, CineHeart SeptumFollow-Up StudiesAtrial Function, LeftFetal HeartEchocardiography, Four-DimensionalVentricular RemodelingVentricular Dysfunction, RightDogsBlood PressureMyocardial RevascularizationHeart Valve ProsthesisVentricular Function, RightPrognosisTricuspid Valve InsufficiencyMitral Valve StenosisHeart Function TestsAortic Valve InsufficiencyTricuspid ValveTime FactorsVentricular FunctionAmrinoneVentricular PressureMilrinoneMitral Valve ProlapseTreatment OutcomeCardiac Surgical ProceduresRadionuclide VentriculographyAtropineEnoximoneVasodilator AgentsHeart Valve Prosthesis ImplantationPericardial EffusionVentricular DysfunctionSeverity of Illness IndexHeart Septal Defects, VentricularPyridazinesFluorocarbonsCoronary Artery Disease