Ventricular Dysfunction, LeftHeart FailureHeartStroke VolumeVentricular DysfunctionVentricular Function, LeftVentricular Dysfunction, RightEchocardiographyHeart RateNatriuretic Peptide, BrainHemodynamicsCardiac Output, LowMyocardiumCardiomyopathiesCardiomyopathy, DilatedMyocardial InfarctionMyocardial ContractionVentricular RemodelingCardiotonic AgentsElectrocardiographySystoleMyocardial IschemiaHeart VentriclesTreatment OutcomeHeart DiseasesAngiotensin-Converting Enzyme InhibitorsFollow-Up StudiesDobutamineChronic DiseaseTime FactorsHeart Failure, SystolicRadionuclide VentriculographyMyocardial StunningDiastolePrognosisProspective StudiesEchocardiography, DopplerExercise TestPredictive Value of TestsEnalaprilCardiac Pacing, ArtificialMitral Valve InsufficiencyAdrenergic beta-AntagonistsHypertrophy, Left VentricularHeart Function TestsCoronary DiseaseRisk FactorsBiological MarkersSeverity of Illness IndexTakotsubo CardiomyopathyAtrial Natriuretic FactorHeart TransplantationRetrospective StudiesDogsDisease Models, AnimalDefibrillators, ImplantableVentricular PressureHeart Failure, DiastolicThallium RadioisotopesCoronary Artery BypassTomography, Emission-Computed, Single-PhotonCardiomegalyArrhythmias, CardiacHeart AtriaBlood PressureCoronary CirculationTissue SurvivalMyocytes, CardiacCardiac CatheterizationMyocardial RevascularizationExercise TolerancePropanolaminesDeath, Sudden, CardiacRisk AssessmentCardiac VolumePulmonary Wedge PressureTachycardia, VentricularCardiac OutputHospitalizationSurvival RateSurvival AnalysisDiureticsAortic Valve StenosisDouble-Blind MethodProportional Hazards ModelsVasodilator AgentsMyocarditisAtrial FibrillationFibrosisSensitivity and SpecificityAnti-Arrhythmia AgentsHeart Defects, CongenitalMitral ValveCardiac Resynchronization TherapyOxygen ConsumptionCoronary AngiographyTreatment FailureAortic ValveHeart Valve ProsthesisHeart-Assist Devices