Heart FailureNatriuretic Peptide, BrainHeartHeart RateCardiac Output, LowHeart Failure, SystolicHeart Failure, DiastolicStroke VolumeMyocardiumHeart DiseasesHeart TransplantationCardiomyopathy, DilatedVentricular Function, LeftVentricular Dysfunction, LeftHemodynamicsTreatment FailureChronic DiseaseAdrenergic beta-AntagonistsVentricular RemodelingTreatment OutcomeTime FactorsEchocardiographyHeart Defects, CongenitalCardiotonic AgentsMyocardial ContractionCardiac Pacing, ArtificialFollow-Up StudiesProspective StudiesHeart Function TestsCardiomyopathiesMyocardial InfarctionCardiomegalyPrognosisMyocytes, CardiacDiureticsRisk FactorsAngiotensin-Converting Enzyme InhibitorsHeart Atria