Heart FailureVentricular Function, LeftHeartVentricular Dysfunction, LeftStroke VolumeHeart RateVentricular Function, RightEchocardiographyHeart VentriclesVentricular FunctionMyocytes, CardiacMyocardiumMyocardial ContractionCardiac Output, LowHemodynamicsMyocardial InfarctionCardiomyopathy, DilatedHeart DiseasesCardiac OutputVentricular RemodelingTime FactorsSystoleHeart Function TestsCardiac Pacing, ArtificialTreatment OutcomeHeart Failure, SystolicCardiomyopathiesDiastoleElectrocardiographyCardiomegalyNatriuretic Peptide, BrainCardiotonic AgentsHeart TransplantationFollow-Up StudiesHeart Failure, DiastolicArrhythmias, CardiacProspective StudiesVentricular Dysfunction, RightCardiac CatheterizationEchocardiography, DopplerAdrenergic beta-AntagonistsHeart Defects, CongenitalMyocardial IschemiaCardiac Surgical ProceduresHypertrophy, Left VentricularChronic DiseaseHeart AtriaExercise TestDogsCardiac VolumeDeath, Sudden, CardiacVentricular PressureBlood PressureRadionuclide VentriculographyPredictive Value of TestsPrognosisCoronary DiseaseDisease Models, AnimalVentricular DysfunctionRisk FactorsTreatment FailureCoronary CirculationRetrospective StudiesGated Blood-Pool ImagingAngiotensin-Converting Enzyme InhibitorsHeart-Assist DevicesRadionuclide AngiographySeverity of Illness IndexBiological MarkersPropanolaminesDobutamineExercise ToleranceMitral Valve InsufficiencyPacemaker, ArtificialFibrosisAtrial Natriuretic FactorOxygen ConsumptionFetal HeartAtrial Function, LeftMyocarditisMagnetic Resonance Imaging, CineRisk AssessmentDiureticsHeart ValvesMyocardial Reperfusion InjuryRats, Sprague-DawleyCardiac Resynchronization TherapyHeart BlockAtrial FibrillationEchocardiography, Doppler, ColorMetoprololCardiovascular AgentsEchocardiography, Doppler, PulsedCoronary Artery BypassCoronary VesselsCoronary AngiographyHospitalizationPulmonary Wedge PressureSurvival RateCarbazoles