Heart FailureTreatment FailureHeartHeart RateCardiac Output, LowHeart Failure, SystolicTreatment OutcomeHeart Failure, DiastolicStroke VolumeMyocardiumCardiomyopathy, DilatedNatriuretic Peptide, BrainHeart DiseasesTime FactorsVentricular Function, LeftChronic DiseaseFollow-Up StudiesHeart TransplantationProspective StudiesHemodynamicsRetrospective StudiesPrognosisVentricular Dysfunction, LeftAdrenergic beta-AntagonistsVentricular Remodeling