BackgroundHeart failure (HF) is a major cause of death among the elderly. Its prevalence increases dramatically with age. The prevalence of malnourished subjects is high in hospitalized elderly patients. We aimed to investigate the prognostic role of malnutrition, assessed by controlling nutritional status (CONUT) score, on adverse clinical outcomes in the elderly admitted for acute HF.MethodsWe enrolled 293 patients (mean age 84 years; 48% men) consecutively admitted for acute HF to the Internal Medicine or Geriatrics Divisions at the ‘IRCCS Sacro Cuore-Don Calabria’ Hospital of Negrar (Verona, Italy) from 2013 to 2015. We predicted the risk of all-cause death, re-hospitalizations for HF and non-HF causes, and the composite of all-cause death or hospitalizations over 2-year follow-up. Patients were divided into four groups according to CONUT score: normal-CONUT (0–1;n= 30); mild-CONUT (2–3;n= 56); moderate-CONUT (4–7;n= 171); and severe-CONUT (≥ 8;n= 36).ResultsHigher CONUT scores were associated with older age and lower entry blood pressures. No difference in hemodynamics was noted at the discharge. Kaplan–Meier curves showed a significant association between worsening CONUT scores and risk of all-cause death (p< 0.01), re-hospitalizations (p< 0.01), or both (p< 0.001). Cox regression analysis revealed these significant associations persisted after adjustment for age, sex, pre-existing cardiovascular disease, diabetes, chronic kidney disease, heart rate, systolic blood pressure, and plasma brain natriuretic peptide levels at discharge (all-cause mortality HR = 1.29 (1.00–1.66),p= 0.049; hospitalization for HF HR = 1.36 (1.03–1.81),p= 0.033; hospitalization for non-HF HR = 1.38 (1.03–1.86),p= 0.034; composite outcome HR = 1.33 (1.07–1.64),p= 0.01).ConclusionsMalnutrition, assessed by the CONUT score, is common among elderly patients admitted for acute HF and is strongly related to increased long-term risk of all-cause death and re-hospitalizations.