Heart FailureHeartHeart RateCardiac Output, LowHeart DiseasesHeart Failure, SystolicHeart TransplantationHeart Defects, CongenitalHeart Failure, DiastolicMyocardiumStroke VolumeCardiomyopathy, DilatedVentricular Function, LeftHemodynamicsVentricular Dysfunction, LeftNatriuretic Peptide, BrainFetal HeartMyocardial ContractionChronic DiseaseHeart AtriaTime FactorsAdrenergic beta-AntagonistsVentricular RemodelingHeart Function TestsHeart ValvesEchocardiographyCardiotonic AgentsTreatment FailureTreatment OutcomeMyocytes, CardiacCardiac Pacing, ArtificialCardiomyopathiesCardiomegalyMyocardial InfarctionMyocardial IschemiaFollow-Up StudiesProspective StudiesRisk FactorsHeart BlockPrognosisDiureticsExercise TestHeart-Assist DevicesDisease Models, AnimalDogsHospitalizationPropanolaminesSystoleBiological MarkersOxygen ConsumptionAngiotensin-Converting Enzyme InhibitorsDiastoleRetrospective StudiesHeart Arrest, InducedPredictive Value of TestsCoronary DiseaseSeverity of Illness IndexSympathetic Nervous SystemVentricular PressureDigoxinVentricular DysfunctionRisk AssessmentCarbazolesEchocardiography, DopplerHeart VentriclesKidney Failure, ChronicProportional Hazards ModelsExercise TolerancePatient ReadmissionDouble-Blind MethodCohort StudiesRats, Sprague-DawleyAtrial Natriuretic FactorPulmonary Wedge PressureSurvival AnalysisMetoprololNorepinephrinePacemaker, ArtificialMineralocorticoid Receptor AntagonistsRats, WistarSurvival RateHeart, ArtificialSpironolactoneFibrosisHypertrophy, Left VentricularVasodilator AgentsMyocarditisCardiac Resynchronization TherapyDeath, Sudden, CardiacAtrial FibrillationAcute DiseaseRheumatic Heart DiseasePerfusionCardiovascular AgentsHeart Valve ProsthesisSarcoplasmic Reticulum Calcium-Transporting ATPasesRNA, MessengerUnited StatesHeart SeptumAnti-Arrhythmia Agents