Heart FailureVentricular Function, LeftHeartVentricular Dysfunction, LeftStroke VolumeMortalityHeart RateVentricular Function, RightEchocardiographyHeart VentriclesVentricular FunctionMyocytes, CardiacMyocardiumMyocardial ContractionCardiac Output, LowMyocardial InfarctionHemodynamicsHeart DiseasesTime FactorsCardiac OutputCardiomyopathy, DilatedTreatment OutcomeFollow-Up StudiesVentricular RemodelingProspective StudiesSystoleHeart Function TestsCardiac Pacing, ArtificialHeart Failure, SystolicCardiomyopathiesElectrocardiographyDiastoleHospital MortalityNatriuretic Peptide, BrainCardiotonic AgentsHeart TransplantationHeart Failure, DiastolicArrhythmias, CardiacMyocardial IschemiaCardiomegalyCardiac CatheterizationVentricular Dysfunction, RightAdrenergic beta-AntagonistsCardiac Surgical ProceduresPrognosisChronic DiseaseHeart Defects, CongenitalRetrospective StudiesEchocardiography, DopplerPredictive Value of TestsHypertrophy, Left VentricularCoronary DiseaseExercise TestDeath, Sudden, CardiacBlood PressureRisk FactorsRadionuclide VentriculographyVentricular PressureDogsHeart AtriaCardiac VolumeVentricular DysfunctionCause of DeathDisease Models, AnimalTreatment FailureRisk AssessmentSeverity of Illness IndexSurvival RateCohort StudiesProportional Hazards ModelsCoronary CirculationSurvival AnalysisGated Blood-Pool ImagingBiological MarkersInfant MortalityHeart-Assist DevicesAngiotensin-Converting Enzyme InhibitorsRadionuclide AngiographyPropanolaminesExercise ToleranceDobutaminePacemaker, ArtificialCoronary Artery BypassOxygen ConsumptionAtrial Natriuretic FactorAge FactorsFibrosisMitral Valve InsufficiencyDiureticsMyocarditisPostoperative ComplicationsFetal HeartHeart ValvesCardiovascular AgentsCardiac Resynchronization TherapyMyocardial Reperfusion InjuryHeart BlockKidney Failure, ChronicMetoprololMagnetic Resonance Imaging, Cine