Heart FailureHeartHeart RateCardiac Output, LowHeart Failure, SystolicHeart Failure, DiastolicStroke VolumeMyocardiumHeart DiseasesCardiomyopathy, DilatedHeart TransplantationNatriuretic Peptide, BrainVentricular Function, LeftVentricular Dysfunction, LeftChronic DiseaseHemodynamicsTreatment FailureAdrenergic beta-AntagonistsVentricular RemodelingTreatment OutcomeTime FactorsHeart Defects, CongenitalEchocardiographyCardiotonic AgentsDisease Models, AnimalMyocardial ContractionCardiac Pacing, ArtificialCardiomyopathiesFollow-Up StudiesHeart Function TestsProspective StudiesCardiomegalyRisk FactorsPrognosisMyocytes, CardiacMyocardial InfarctionDiureticsAngiotensin-Converting Enzyme InhibitorsHeart AtriaBiological MarkersHeart-Assist DevicesHospitalizationMyocardial IschemiaPropanolaminesFetal HeartExercise TestSeverity of Illness IndexSystoleDogsRetrospective StudiesHeart ValvesHeart VentriclesPredictive Value of TestsDiastoleKidney Failure, ChronicExercise ToleranceDigoxinAtrial Natriuretic FactorVentricular DysfunctionCarbazolesSympathetic Nervous SystemOxygen ConsumptionRisk AssessmentPatient ReadmissionHeart BlockVentricular PressureEchocardiography, DopplerDisease ProgressionProportional Hazards ModelsSurvival AnalysisCardiovascular AgentsCohort StudiesDouble-Blind MethodMineralocorticoid Receptor AntagonistsBlood PressurePulmonary Wedge PressureAcute DiseaseFibrosisSurvival RateSpironolactoneMetoprololFailure to ThriveCoronary DiseasePacemaker, ArtificialCase-Control StudiesRats, Sprague-DawleyCardiac Resynchronization TherapyKidneyElectrocardiographyNorepinephrineMyocarditisVasodilator AgentsAtrial FibrillationMice, Inbred C57BLRNA, MessengerDeath, Sudden, CardiacCardio-Renal SyndromeKaplan-Meier EstimateHypertrophy, Left VentricularArrhythmias, Cardiac