Heart FailureHeartHeart RateHemodynamicsMyocytes, CardiacCardiomyopathy, DilatedVentricular Function, LeftStroke VolumeMyocardiumVentricular Dysfunction, LeftHeart DiseasesNatriuretic Peptide, BrainCardiac Output, LowCardiac Pacing, ArtificialEchocardiographyCardiac OutputMyocardial InfarctionTreatment OutcomeHeart Failure, SystolicCardiotonic AgentsMyocardial ContractionTime FactorsFollow-Up StudiesAdrenergic beta-AntagonistsHeart VentriclesArrhythmias, CardiacAngiotensin-Converting Enzyme InhibitorsCardiomegalyCardiomyopathiesDiureticsVentricular RemodelingAtrial Natriuretic FactorChronic DiseaseHeart TransplantationProspective StudiesHeart Failure, DiastolicHeart Function TestsRisk FactorsPrognosisElectrocardiographyDeath, Sudden, CardiacCheyne-Stokes RespirationDogsCardiac Surgical ProceduresHeart AtriaRetrospective StudiesHeart Defects, CongenitalBlood PressureHospitalizationDigoxinMyocardial IschemiaExercise TestPredictive Value of TestsPulmonary Wedge PressureBiological MarkersPropanolaminesCardiac CatheterizationAtrial FibrillationTreatment FailureSeverity of Illness IndexDiastoleSystoleDisease Models, AnimalNorepinephrineCardiovascular AgentsSpironolactoneRisk AssessmentSurvival AnalysisSympathetic Nervous SystemVentricular DysfunctionHeart-Assist DevicesEchocardiography, DopplerExercise ToleranceCarbazolesPatient ReadmissionFurosemideSurvival RateCardiac VolumeDouble-Blind MethodHypertrophy, Left VentricularMyocarditisPacemaker, ArtificialProportional Hazards ModelsOxygen ConsumptionAnti-Arrhythmia AgentsMineralocorticoid Receptor AntagonistsCaptoprilMetoprololVentricular PressureHeart ValvesMilrinoneCohort StudiesEnalaprilKidney Failure, ChronicNatriuretic AgentsCoronary DiseaseVasodilator AgentsCardiac Resynchronization TherapyFetal HeartComorbidity