Ventricular Function, LeftHeart FailureHeartVentricular Dysfunction, LeftStroke VolumeEchocardiographyHeart VentriclesHeart RateVentricular Function, RightMyocardial InfarctionMyocardial ContractionHemodynamicsVentricular FunctionMyocardiumSystoleDiastoleCardiomyopathy, DilatedHeart Function TestsCardiac Output, LowRadionuclide VentriculographyElectrocardiographyGated Blood-Pool ImagingVentricular RemodelingTime FactorsEchocardiography, DopplerHeart DiseasesTreatment OutcomeFollow-Up StudiesCardiomyopathiesCardiotonic AgentsRadionuclide AngiographyMyocardial IschemiaCoronary CirculationProspective StudiesExercise TestVentricular Dysfunction, RightCoronary DiseaseNatriuretic Peptide, BrainCardiac Pacing, ArtificialAdrenergic beta-AntagonistsCardiac CatheterizationHeart Failure, SystolicHeart Failure, DiastolicVentricular PressureChronic DiseaseCardiac OutputCardiac VolumePredictive Value of TestsHeart TransplantationBlood PressureCineangiographyAngiocardiographyVentriculography, First-PassDobutamineHypertrophy, Left VentricularPrognosisMitral Valve InsufficiencyDogsEchocardiography, Doppler, PulsedCardiomegalyHeart Defects, CongenitalCoronary AngiographyTomography, Emission-Computed, Single-PhotonMyocytes, CardiacPropanolaminesMyocardial ReperfusionMagnetic Resonance Imaging, CineCoronary Artery BypassVentricular DysfunctionDisease Models, AnimalTreatment FailureAngiotensin-Converting Enzyme InhibitorsPhonocardiographyHeart AtriaExercise ToleranceRisk FactorsMetoprololSeverity of Illness IndexEchocardiography, Doppler, ColorMyocardial Reperfusion InjuryAortic Valve StenosisAngina PectorisRetrospective StudiesGold RadioisotopesMitral ValveAngioplasty, Balloon, CoronaryPacemaker, ArtificialRecovery of FunctionCoronary VesselsArrhythmias, CardiacHeart-Assist DevicesOxygen ConsumptionEchocardiography, StressCarbazolesBiological MarkersMyocarditisAtrial Function, LeftCardiovascular AgentsTechnetium Tc 99m SestamibiHeart Valve Prosthesis