Heart FailureStroke VolumeVentricular Function, LeftVentricular Dysfunction, LeftCardiomyopathy, DilatedHeartEchocardiographyGated Blood-Pool ImagingMyocardial InfarctionNatriuretic Peptide, BrainRadionuclide VentriculographyFollow-Up StudiesHeart VentriclesTreatment OutcomeRadionuclide AngiographyHemodynamicsElectrocardiographyProspective StudiesSystoleHeart Failure, SystolicHeart RatePrognosisPredictive Value of TestsExercise TestCardiac Output, LowTime FactorsHeart DiseasesCardiomyopathiesAdrenergic beta-AntagonistsMyocardiumHeart Function TestsEchocardiography, DopplerDefibrillators, ImplantableCardiac Pacing, ArtificialDiastoleVentricular RemodelingMyocardial ContractionVentriculography, First-PassChronic DiseaseDeath, Sudden, CardiacCardiotonic AgentsHeart Failure, DiastolicRisk FactorsMyocardial IschemiaRetrospective StudiesPropanolaminesCheyne-Stokes RespirationSeverity of Illness IndexElectrocardiography, AmbulatoryVentricular Function, RightTachycardia, VentricularExercise ToleranceBiological MarkersAngiotensin-Converting Enzyme InhibitorsTomography, Emission-Computed, Single-PhotonCardiac OutputArrhythmias, CardiacRisk AssessmentSurvival AnalysisCardiac CatheterizationCarbazoles3-IodobenzylguanidineCoronary DiseaseMitral Valve InsufficiencySurvival RateProportional Hazards ModelsAtrial FibrillationCardiac Resynchronization TherapyAortic Valve StenosisMagnetic Resonance Imaging, CineCoronary Artery BypassPulmonary Wedge PressureHospitalizationMultivariate AnalysisBlood PressureCoronary AngiographyVentricular Dysfunction, RightCineangiographyDiureticsAtrial Natriuretic FactorHeart TransplantationKaplan-Meier EstimateHypertrophy, Left VentricularCardiac VolumeCardiovascular AgentsChi-Square DistributionDouble-Blind MethodDigoxinAngioplasty, Balloon, CoronaryDobutamineMetoprololHeart AtriaVentricular FibrillationAmiodaroneAnti-Arrhythmia AgentsPacemaker, ArtificialHeart Valve Prosthesis ImplantationROC CurveVentricular FunctionVentricular Dysfunction