Effect of heart failure and malnutrition, alone and in combination, on rehabilitation effectiveness in patients with hip fracture.

Abstract

Heart failure and malnutrition are known to each negatively affect a patient's ability to improve their activities of daily living (ADL) through rehabilitation. Here, we investigated whether the negative effects of malnutrition and heart failure on ADL are additive in patients after hip fracture. This retrospective observational cohort study included 155 patients with hip fracture admitted to convalescent rehabilitation wards. Nutritional status was measured with the Geriatric Nutritional Risk Index (GNRI). Heart failure was assessed using plasma B-type natriuretic peptide (BNP) levels. Based on their GNRIs and BNP levels, patients were classified into four groups: a high GNRI (≥92)-low BNP (<100pg/ml) group (n=54); high GNRI-high BNP (≥100pg/ml) group (n=7); low GNRI (<92)-low BNP group (n=67); and low GNRI-high BNP group (n=27). The main outcome was rehabilitation effectiveness (REs). To confirm above hypothesis, heart failure was also assessed by American College of Cardiology/American Heart Association (ACC/AHA) stage classification, whereas nutrition was assessed by Mini Nutritional Assessment Short Form (MNA-SF), either. REs in the high GNRI-low BNP group, high GNRI-high BNP group, low GNRI-low BNP group, and low GNRI-high BNP group were 64.8±22.6%, 36.0±22.0%, 40.6±23.6% and 28.5±25.9%, respectively. REs was higher in the high GNRI-low BNP group than in other three groups, and REs in the low GNRI-low BNP group was higher than in the low GNRI-high BNP group. When we evaluated heart failure by ACC/AHA stage classification instead of BNP, or evaluated nutrition by MNA-SF instead of GNRI, the similar results were demonstrated. Multiple linear regression analyses revealed that age (p<0.01), handgrip strength (p<0.01), GNRI (p<0.05), and BNP (p<0.01) were significantly associated with REs. These results suggest that malnutrition and heart failure are independently associated with REs and that they have an additive negative effect on improvement of ADL in elderly patients with hip fractures.