Heart FailureHeartHeart RateCardiac Output, LowHeart Failure, SystolicCardiomyopathy, DilatedStroke VolumeHemodynamicsNatriuretic Peptide, BrainVentricular Function, LeftVentricular Dysfunction, LeftMyocardiumDrosophilidaeHeart Failure, DiastolicChronic DiseaseEchocardiographyAdrenergic beta-AntagonistsTreatment OutcomeCardiotonic AgentsHeart TransplantationCardiac Pacing, ArtificialDiureticsFollow-Up StudiesAngiotensin-Converting Enzyme InhibitorsVentricular RemodelingMyocardial InfarctionTime FactorsMyocardial ContractionTreatment FailureProspective StudiesRisk FactorsCardiomyopathiesHeart Function TestsPrognosisAtrial Natriuretic FactorCardiomegalyHeart Defects, CongenitalHospitalizationHeart VentriclesHeart AtriaExercise TestDigoxinPropanolaminesCheyne-Stokes RespirationRetrospective StudiesDogsMyocardial IschemiaMyocytes, CardiacSeverity of Illness IndexBiological MarkersHeart-Assist DevicesPredictive Value of TestsSystolePulmonary Wedge PressureDiastoleSympathetic Nervous SystemDisease Models, AnimalElectrocardiographyExercise ToleranceCarbazolesBlood PressureSpironolactonePatient ReadmissionAtrial FibrillationCardiovascular AgentsVentricular DysfunctionSurvival AnalysisRisk AssessmentNorepinephrineEchocardiography, DopplerDouble-Blind MethodProportional Hazards ModelsKidney Failure, ChronicOxygen ConsumptionMineralocorticoid Receptor AntagonistsSurvival RateHeart ValvesMetoprololArrhythmias, CardiacFurosemideCohort StudiesVentricular PressurePacemaker, ArtificialFetal HeartCardiac OutputAnti-Arrhythmia AgentsNatriuretic AgentsAmnionMyocarditisCaptoprilHeart BlockVasodilator AgentsMilrinoneEnalaprilCoronary DiseaseComorbidityUnited StatesAcute DiseaseDyspneaDeath, Sudden, Cardiac