Heart FailureVentricular Function, LeftHeartPrognosisVentricular Dysfunction, LeftStroke VolumeHeart RateVentricular Function, RightEchocardiographyHeart VentriclesVentricular FunctionMyocytes, CardiacMyocardiumMyocardial ContractionCardiac Output, LowHemodynamicsMyocardial InfarctionHeart DiseasesCardiomyopathy, DilatedCardiac OutputTime FactorsTreatment OutcomeVentricular RemodelingSystoleHeart Function TestsCardiac Pacing, ArtificialHeart Failure, SystolicFollow-Up StudiesCardiomyopathiesDiastoleElectrocardiographyNatriuretic Peptide, BrainProspective StudiesHeart TransplantationCardiotonic AgentsHeart Failure, DiastolicArrhythmias, CardiacVentricular Dysfunction, RightCardiomegalyCardiac CatheterizationMyocardial IschemiaAdrenergic beta-AntagonistsEchocardiography, DopplerHeart Defects, CongenitalCardiac Surgical ProceduresChronic DiseaseHypertrophy, Left VentricularExercise TestPredictive Value of TestsDeath, Sudden, CardiacRadionuclide VentriculographyDogsBlood PressureVentricular PressureRetrospective StudiesHeart AtriaCardiac VolumeCoronary DiseaseRisk FactorsVentricular DysfunctionTreatment FailureDisease Models, AnimalCoronary CirculationGated Blood-Pool ImagingSurvival RateBiological MarkersSurvival AnalysisSeverity of Illness IndexHeart-Assist DevicesRadionuclide AngiographyAngiotensin-Converting Enzyme InhibitorsPropanolaminesDobutamineExercise TolerancePacemaker, ArtificialRisk AssessmentOxygen ConsumptionAtrial Natriuretic FactorFetal HeartFibrosisProportional Hazards ModelsMitral Valve InsufficiencyMyocarditisDiureticsHeart ValvesHeart BlockMagnetic Resonance Imaging, CineCardiac Resynchronization TherapyMyocardial Reperfusion InjuryCardiovascular AgentsMetoprololHospitalizationCoronary Artery BypassKaplan-Meier EstimateEchocardiography, Doppler, PulsedAtrial Function, LeftEchocardiography, Doppler, ColorAtrial FibrillationHeart ArrestCoronary Angiography