Heart FailureHeartHeart RateCardiac Output, LowHeart DiseasesHeart Failure, SystolicHeart TransplantationHeart Defects, CongenitalHeart Failure, DiastolicMyocardiumStroke VolumeCardiomyopathy, DilatedVentricular Function, LeftHemodynamicsVentricular Dysfunction, LeftNatriuretic Peptide, BrainFetal HeartChronic DiseaseMyocardial ContractionHeart AtriaAdrenergic beta-AntagonistsVentricular RemodelingHeart Function TestsHeart ValvesEchocardiographyTreatment FailureCardiotonic AgentsTime FactorsTreatment OutcomeMyocytes, CardiacCardiac Pacing, ArtificialCardiomegalyCardiomyopathiesMyocardial InfarctionMyocardial IschemiaFollow-Up StudiesProspective StudiesHeart BlockRisk FactorsPrognosisDiureticsHeart-Assist DevicesExercise TestHospitalizationPropanolaminesDisease Models, AnimalDogsSystoleBiological MarkersAngiotensin-Converting Enzyme InhibitorsDiastoleHeart Arrest, InducedCoronary DiseaseRetrospective StudiesSeverity of Illness IndexPredictive Value of TestsOxygen ConsumptionSympathetic Nervous SystemVentricular PressureVentricular DysfunctionDigoxinCarbazolesRisk AssessmentEchocardiography, DopplerHeart VentriclesKidney Failure, ChronicProportional Hazards ModelsPatient ReadmissionExercise ToleranceDouble-Blind MethodCohort StudiesAtrial Natriuretic FactorPulmonary Wedge PressureMetoprololSurvival AnalysisNorepinephrinePacemaker, ArtificialMineralocorticoid Receptor AntagonistsRats, Sprague-DawleySurvival RateHeart, ArtificialSpironolactoneMyocarditisRats, WistarFibrosisHypertrophy, Left VentricularVasodilator AgentsCardiac Resynchronization TherapyDeath, Sudden, CardiacAtrial FibrillationRheumatic Heart DiseaseHeart Valve ProsthesisCardiovascular AgentsAcute DiseaseSarcoplasmic Reticulum Calcium-Transporting ATPasesPerfusionHeart SeptumAnti-Arrhythmia AgentsMyocardial Reperfusion InjuryDisease Progression