Heart FailureHeartHeart RateCardiac Output, LowHeart Failure, SystolicHeart Failure, DiastolicStroke VolumeMyocardiumHeart DiseasesHeart TransplantationCardiomyopathy, DilatedNatriuretic Peptide, BrainVentricular Function, LeftVentricular Dysfunction, LeftHemodynamicsTreatment FailureChronic DiseaseAdrenergic beta-AntagonistsVentricular RemodelingHeart Defects, CongenitalTreatment OutcomeEchocardiographyCardiotonic AgentsMyocardial ContractionTime FactorsCardiac Pacing, ArtificialHeart Function TestsFollow-Up StudiesCardiomyopathiesProspective StudiesCardiomegalyMyocardial InfarctionMyocytes, CardiacDiureticsPrognosisRisk FactorsAngiotensin-Converting Enzyme InhibitorsHeart AtriaHeart-Assist DevicesHospitalizationFetal HeartPropanolaminesMyocardial IschemiaExercise TestSystoleDisease Models, AnimalBiological MarkersHeart ValvesSeverity of Illness IndexHeart VentriclesDiastoleRetrospective StudiesDogsPredictive Value of TestsExercise ToleranceDigoxinKidney Failure, ChronicAtrial Natriuretic FactorVentricular DysfunctionCarbazolesSympathetic Nervous SystemOxygen ConsumptionPatient ReadmissionEchocardiography, DopplerHeart BlockVentricular PressureRisk AssessmentProportional Hazards ModelsCardiovascular AgentsPulmonary Wedge PressureDouble-Blind MethodMineralocorticoid Receptor AntagonistsSurvival AnalysisMetoprololSpironolactoneFailure to ThriveCohort StudiesSurvival RatePacemaker, ArtificialBlood PressureCardiac Resynchronization TherapyCoronary DiseaseElectrocardiographyNorepinephrineAcute DiseaseVasodilator AgentsAtrial FibrillationDeath, Sudden, CardiacDisease ProgressionFibrosisCardio-Renal SyndromeHypertrophy, Left VentricularArrhythmias, CardiacKaplan-Meier EstimateLiver Failure, AcuteSarcoplasmic Reticulum Calcium-Transporting ATPasesDyspneaMyocarditisRats, Sprague-DawleyNatriuretic Agents