Heart FailureStroke VolumeHeartVentricular Function, LeftVentricular Dysfunction, LeftHeart RateEchocardiographyCardiac Output, LowCardiomyopathy, DilatedHeart Failure, SystolicHeart Failure, DiastolicVentricular RemodelingHeart VentriclesMyocardial InfarctionSystoleNatriuretic Peptide, BrainHemodynamicsMyocardiumGated Blood-Pool ImagingMyocardial ContractionTreatment OutcomeHeart DiseasesEchocardiography, DopplerFollow-Up StudiesHeart Function TestsDiastoleProspective StudiesTime FactorsCardiomyopathiesExercise TestAdrenergic beta-AntagonistsChronic DiseasePrognosisRadionuclide VentriculographyCardiac Pacing, ArtificialPredictive Value of TestsElectrocardiographyRadionuclide AngiographyHeart TransplantationCardiotonic AgentsCardiac VolumeVentricular Function, RightExercise ToleranceRisk FactorsMyocardial IschemiaSeverity of Illness IndexRetrospective StudiesPropanolaminesMilk EjectionCardiac OutputMitral Valve InsufficiencyBiological MarkersAngiotensin-Converting Enzyme InhibitorsMagnetic Resonance Imaging, CineTreatment FailureVentriculography, First-PassVentricular PressureDefibrillators, ImplantableVentricular Dysfunction, RightVentricular DysfunctionHeart AtriaCardiac CatheterizationCardiac Resynchronization TherapyCoronary DiseaseHeart Defects, CongenitalHospitalizationHypertrophy, Left VentricularDeath, Sudden, CardiacRisk AssessmentDiureticsBlood PressureMyocytes, CardiacCarbazolesSurvival AnalysisPulmonary Wedge PressureCardiomegalySurvival RateEchocardiography, Three-DimensionalProportional Hazards ModelsArrhythmias, CardiacHeart-Assist DevicesOxygen ConsumptionDisease Models, AnimalTomography, Emission-Computed, Single-PhotonMetoprololPacemaker, ArtificialTachycardia, VentricularDigoxinDouble-Blind MethodAortic Valve StenosisKaplan-Meier EstimateElectrocardiography, AmbulatoryCardiovascular AgentsReproducibility of ResultsAtrial FibrillationMultivariate AnalysisAtrial Natriuretic FactorCineangiographyDobutamineVentricular Function