Heart FailureHeartHeart RateCardiac Output, LowStroke VolumeHeart Failure, SystolicVentricular Function, LeftVentricular Dysfunction, LeftCardiac Resynchronization TherapyCardiac Pacing, ArtificialAdrenergic beta-AntagonistsNatriuretic Peptide, BrainHeart-Assist DevicesHeart TransplantationTreatment OutcomeHeart Failure, DiastolicChronic DiseaseCardiomyopathy, DilatedHeart DiseasesExercise TestPropanolaminesHemodynamicsVentricular RemodelingExercise ToleranceEchocardiographyCardiotonic AgentsMyocardiumFollow-Up StudiesHydrazonesProspective StudiesTime FactorsPrognosisCheyne-Stokes RespirationCarbazolesDefibrillators, ImplantablePacemaker, ArtificialAngiotensin-Converting Enzyme InhibitorsMyocardial ContractionSystoleDiureticsOxygen ConsumptionCardiac Resynchronization Therapy DevicesPredictive Value of TestsHospitalizationHeart Defects, CongenitalHeart Function TestsSleep Apnea, CentralSeverity of Illness IndexPatient ReadmissionBiological MarkersRisk FactorsRetrospective StudiesKidney Failure, ChronicCardiomyopathiesDigoxinHeart VentriclesSympathetic Nervous SystemEchocardiography, DopplerDeath, Sudden, CardiacPyridazinesMyocardial IschemiaVentricular DysfunctionElectrocardiographyRisk AssessmentTreatment FailureFetal HeartCardiovascular AgentsCardiomegalyMyocytes, CardiacProportional Hazards ModelsSpironolactoneDiastoleHeart AtriaMyocardial InfarctionNatriuretic AgentsSurvival RateMetoprololMineralocorticoid Receptor AntagonistsHeart ValvesCase-Control StudiesDouble-Blind MethodExerciseCardiography, ImpedanceKaplan-Meier EstimateBundle-Branch BlockRespirationCohort StudiesMonitoring, PhysiologicSurvival AnalysisCardiac OutputBlood PressureAtrial Natriuretic FactorQuality of LifeXamoterolMedigoxinPulmonary Wedge PressureTelemetryAngiotensin II Type 1 Receptor BlockersHeart BlockReference Values