Heart Failure, SystolicHeart FailureHeart Failure, DiastolicNatriuretic Peptide, BrainStroke VolumeCardiac Output, LowSystoleVentricular Dysfunction, LeftHeartAdrenergic beta-AntagonistsEchocardiography, DopplerChronic DiseaseHeart RateVentricular Function, LeftDiastoleHospitalizationTreatment OutcomePhosphodiesterase 5 InhibitorsVentricular RemodelingProspective StudiesFollow-Up StudiesEchocardiographyHeart TransplantationMineralocorticoid Receptor AntagonistsPropanolaminesSpironolactonePrognosisExercise TestBiological MarkersSeverity of Illness IndexCardiovascular AgentsDigoxinAngiotensin-Converting Enzyme InhibitorsHemodynamicsDiureticsPredictive Value of TestsKaplan-Meier EstimateProportional Hazards ModelsCardiac Pacing, ArtificialPulmonary Wedge PressureOutpatientsExercise ToleranceMyocardial ContractionCardiac Resynchronization TherapyRisk FactorsTime FactorsHeart VentriclesRisk AssessmentVentricular Function, RightElectrocardiographyOxygen ConsumptionSurvival RateRetrospective StudiesMyocardiumSurvival AnalysisHeart DiseasesDouble-Blind MethodCardiomyopathy, DilatedPeptide FragmentsDefibrillators, ImplantableTreatment FailureDisease ProgressionCohort StudiesGlomerular Filtration RateChi-Square DistributionHeart Defects, CongenitalBlood PressureCase-Control Studies