Heart FailureHydralazineHemodynamicsChronic DiseaseHeartHeart RateCardiomyopathy, DilatedStroke VolumeVentricular Function, LeftNatriuretic Peptide, BrainVentricular Dysfunction, LeftMyocardiumCardiac Output, LowHeart DiseasesHeart Failure, SystolicEchocardiographyTreatment OutcomeDiureticsAngiotensin-Converting Enzyme InhibitorsCardiac Pacing, ArtificialCardiotonic AgentsAdrenergic beta-AntagonistsMyocardial InfarctionFollow-Up StudiesHeart Failure, DiastolicAtrial Natriuretic FactorTime FactorsVentricular RemodelingRisk FactorsCheyne-Stokes RespirationProspective StudiesPrognosisMyocardial ContractionHeart TransplantationCardiomyopathiesHeart VentriclesHeart Function TestsHospitalizationDigoxinCardiomegalyRetrospective StudiesDogsExercise TestHeart AtriaTreatment FailurePulmonary Wedge PressurePropanolaminesElectrocardiographyAtrial FibrillationSeverity of Illness IndexPredictive Value of TestsSympathetic Nervous SystemBlood PressureHeart Defects, CongenitalMyocardial IschemiaBiological MarkersSpironolactoneDiastoleSystoleCardiovascular AgentsNorepinephrineSurvival AnalysisPatient ReadmissionCarbazolesFurosemideHeart-Assist DevicesMyocytes, CardiacExercise Tolerance