Heart FailureVentricular Function, LeftHeartVentricular Dysfunction, LeftStroke VolumeHeart RateVentricular Function, RightEchocardiographyHeart VentriclesVentricular FunctionMyocytes, CardiacMyocardiumMyocardial ContractionCardiac Output, LowHemodynamicsMyocardial InfarctionHeart DiseasesCardiac OutputCardiomyopathy, DilatedTime FactorsVentricular RemodelingTreatment OutcomeSystoleHeart Function TestsCardiac Pacing, ArtificialHeart Failure, SystolicCardiomyopathiesDiastoleElectrocardiographyProspective StudiesFollow-Up StudiesHeart TransplantationNatriuretic Peptide, BrainCardiotonic AgentsHeart Failure, DiastolicArrhythmias, CardiacCardiomegalyVentricular Dysfunction, RightCardiac CatheterizationHeart Defects, CongenitalAdrenergic beta-AntagonistsMyocardial IschemiaEchocardiography, DopplerChronic DiseaseCardiac Surgical ProceduresPredictive Value of TestsPrognosisHypertrophy, Left VentricularExercise TestRetrospective StudiesDeath, Sudden, CardiacDogsRadionuclide VentriculographyVentricular PressureBlood PressureHeart AtriaRisk FactorsCardiac VolumeCoronary DiseaseVentricular DysfunctionTreatment FailureDisease Models, AnimalCoronary CirculationGated Blood-Pool ImagingBiological MarkersSeverity of Illness IndexSensitivity and SpecificityHeart-Assist DevicesRadionuclide AngiographyAngiotensin-Converting Enzyme InhibitorsPropanolaminesDobutamineExercise TolerancePacemaker, ArtificialRisk AssessmentFetal HeartOxygen ConsumptionAtrial Natriuretic FactorMyocarditisFibrosisReproducibility of ResultsMitral Valve InsufficiencyDiureticsHeart ValvesHospitalizationSurvival RateMagnetic Resonance Imaging, CineHeart BlockMyocardial Reperfusion InjuryCardiac Resynchronization TherapyCardiovascular AgentsMetoprololEchocardiography, Doppler, ColorEchocardiography, Doppler, PulsedCoronary Artery BypassAtrial Function, LeftSurvival AnalysisAcute DiseaseAtrial FibrillationPulmonary Wedge Pressure