Ventricular Dysfunction, LeftVentricular Function, LeftStroke VolumeEchocardiographySystoleHeart FailureVentricular DysfunctionVentricular Dysfunction, RightMyocardial ContractionDiastoleHemodynamicsHeart VentriclesElectrocardiographyEchocardiography, DopplerHeartCardiomyopathiesMyocardial InfarctionNatriuretic Peptide, BrainProspective StudiesMyocardial StunningDobutamineVentricular RemodelingRadionuclide VentriculographyMyocardiumCardiomyopathy, DilatedMyocardial IschemiaCardiotonic AgentsAngiotensin-Converting Enzyme InhibitorsEnalaprilMitral Valve InsufficiencyTakotsubo CardiomyopathyTreatment OutcomeFollow-Up StudiesHypertrophy, Left VentricularThallium RadioisotopesPrognosisTomography, Emission-Computed, Single-PhotonCoronary Artery BypassCoronary DiseaseExercise TestTime FactorsPredictive Value of TestsCardiac Output, LowTissue SurvivalMyocardial RevascularizationCoronary CirculationHeart DiseasesDefibrillators, ImplantableChronic DiseaseAtrial Natriuretic FactorSeverity of Illness IndexBiological MarkersCardiac Pacing, ArtificialArrhythmias, CardiacRisk FactorsVentricular PressureHeart RateAortic Valve StenosisHeart Function TestsRetrospective StudiesDogsCardiac Catheterization