DobutamineEchocardiographyCardiotonic AgentsEchocardiography, StressEchocardiography, DopplerVentricular Function, LeftVentricular Dysfunction, LeftMyocardial ContractionEchocardiography, Doppler, ColorStroke VolumeEchocardiography, TransesophagealHeart VentriclesMitral ValveHemodynamicsExercise TestEchocardiography, Three-DimensionalDiastoleSystolePredictive Value of TestsElectrocardiographyHeartAdrenergic beta-AgonistsMyocardial StunningEchocardiography, Doppler, PulsedHypertrophy, Left VentricularMitral Valve InsufficiencyMyocardial IschemiaHeart AtriaSensitivity and SpecificityAdrenergic beta-1 Receptor AgonistsObserver VariationCoronary CirculationProspective StudiesCardiac CatheterizationCoronary DiseaseMitral Valve StenosisHeart FailureMitral Valve ProlapseCardiac VolumeHeart DiseasesVentricular Function, RightAortic ValveAtrial Function, LeftCardiomyopathy, DilatedHydrazonesCardiomyopathiesHeart RateAortic Valve StenosisFollow-Up StudiesAortic Valve InsufficiencyHeart SeptumBlood Flow VelocityVentricular RemodelingCoronary AngiographyVentricular Dysfunction, RightHeart Valve DiseasesMyocardiumMyocardial InfarctionTricuspid ValveTissue SurvivalReproducibility of ResultsHeart Septal Defects, VentricularTomography, Emission-Computed, Single-PhotonFeasibility StudiesTricuspid Valve InsufficiencyCardiac OutputDipyridamoleHeart Defects, CongenitalTreatment OutcomeThallium RadioisotopesPrognosisTechnetium Tc 99m SestamibiBlood PressureCardiomyopathy, HypertrophicVentricular FunctionDogsCardiac Pacing, ArtificialTime FactorsMagnetic Resonance Imaging, CineHeart Valve ProsthesisAmrinoneMilrinoneVentricular PressureRheumatic Heart DiseaseSeverity of Illness IndexPyridazinesHeart Septal Defects, AtrialHeart Function TestsNatriuretic Peptide, BrainVentricular DysfunctionHeart NeoplasmsPericardial EffusionHeart Valve Prosthesis ImplantationEndocardiumRetrospective StudiesMyocardial RevascularizationFetal HeartPulmonary Wedge PressureMyxomaHeart Valves