Heart FailureHeartChronic DiseaseCardiac Output, LowHeart RateHeart Failure, SystolicStroke VolumeNatriuretic Peptide, BrainAdrenergic beta-AntagonistsHemodynamicsCardiomyopathy, DilatedVentricular Dysfunction, LeftExercise ToleranceVentricular Function, LeftHeart Failure, DiastolicExercise TestMyocardiumPropanolaminesHeart TransplantationVentricular RemodelingHeart DiseasesAngiotensin-Converting Enzyme InhibitorsCarbazolesEchocardiographyTreatment OutcomeCardiotonic AgentsDiureticsOxygen ConsumptionPrognosisHeart Function TestsProspective StudiesFollow-Up StudiesTreatment FailureTime FactorsMyocardial ContractionMetoprololCardiac Pacing, ArtificialHospitalizationBiological MarkersMyocardial InfarctionHeart Defects, CongenitalSeverity of Illness IndexDigoxinAtrial Natriuretic FactorCheyne-Stokes RespirationDouble-Blind MethodHeart-Assist DevicesCardiomyopathiesPredictive Value of TestsSympathetic Nervous SystemMyocytes, CardiacRisk FactorsCardiomegalySystolePulmonary Wedge PressureMyocardial IschemiaHeart VentriclesDisease Models, AnimalHeart AtriaDiastoleCardio-Renal SyndromeSpironolactoneNorepinephrineBlood PressureMineralocorticoid Receptor AntagonistsRetrospective StudiesVasodilator AgentsCardiovascular AgentsEchocardiography, DopplerCardiac OutputExerciseBisoprololDyspneaProportional Hazards ModelsSurvival AnalysisDogsSurvival RatePatient ReadmissionVentricular PressureRisk AssessmentVentricular DysfunctionExercise TherapyMuscle, SkeletalEnalaprilFetal HeartVascular ResistanceSleep Apnea, CentralElectrocardiographyKidney Failure, ChronicForearmDeath, Sudden, CardiacCase-Control StudiesAngiotensin II Type 1 Receptor BlockersPacemaker, ArtificialHeart ValvesSteam BathCardiac Resynchronization TherapyQuality of LifeNatriuretic PeptidesCohort Studies