Stroke VolumeVentricular Function, LeftVentricular Dysfunction, LeftMilk EjectionHeart FailureEchocardiographyHeart VentriclesHypertrophy, Left VentricularSystoleGated Blood-Pool ImagingMyocardial ContractionAtrial Function, LeftDiastoleMyocardial InfarctionCardiomyopathy, DilatedVentricular RemodelingHeartHemodynamicsElectrocardiographyCardiac VolumeRadionuclide VentriculographyEchocardiography, DopplerTreatment OutcomeTime FactorsFollow-Up StudiesRadionuclide AngiographyMyocardiumProspective StudiesHeart Function TestsVentricular Function, RightPredictive Value of TestsCardiomyopathiesExercise TestCardiac OutputCardiac Pacing, ArtificialNatriuretic Peptide, BrainVentricular FunctionMagnetic Resonance Imaging, CineCardiac CatheterizationHeart RateHeart AtriaPrognosisVentriculography, First-PassHeart DiseasesVentricular PressureAortic Valve StenosisBlood PressureEchocardiography, Three-DimensionalCardiac Output, LowCineangiographyHeart Failure, DiastolicMyocardial IschemiaCoronary CirculationMitral ValveTomography, Emission-Computed, Single-PhotonVentricular Dysfunction, RightAdrenergic beta-AntagonistsHeart Failure, SystolicCoronary DiseaseSeverity of Illness IndexRetrospective StudiesCardiotonic AgentsMitral Valve InsufficiencyExercise ToleranceAngiocardiographyCoronary AngiographyDogsDefibrillators, ImplantableChronic DiseaseObserver VariationDobutamineEchocardiography, Doppler, ColorReproducibility of ResultsCoronary Artery BypassTachycardia, VentricularRisk FactorsAtrial FibrillationHeart AneurysmArrhythmias, CardiacBlood Flow VelocityPropanolaminesVentricular DysfunctionRisk AssessmentPulmonary Wedge PressureAortic ValveEchocardiography, Doppler, PulsedPhonocardiographyHypoplastic Left Heart SyndromeModels, CardiovascularHeart Valve Prosthesis Implantation