Epidemiological study of malnutrition in elderly patients in acute, sub-acute and long-term care using the MNA.

MNA is a simple and accurate way to assess the nutritional status in routine practice, and is suitable for systematic use and large epidemiologic studies. The purpose of this study was to evaluate the difference in the nutritional status of elderly patients hospitalized in different types of care in the same hospital, and to evaluate its relationship with risk factors. Nutritional status was evaluated in 918 elderly patients hospitalized in acute care (AC) (n=299), sub-acute care (SAC) (n=196) or long-term care (LTC) (n=423), using the MNA (Mini-Nutritional Assessment), a nutritional assessment tool including 18 items grouped in 4 domains, within the first 48 h after admission (all subjects) and at the end of hospitalization (AC, SAC). More patients were rated in the "malnourished" class in SAC (32.5%) than in AC (24.5%) and LTC (24. 7%). Retrospective analysis showed that the initial nutritional status was linked to the type of care and the nature of underlying pathology. The nutritional status on arrival was worse in patients in SAC, and better in those in LTC (p = 0.005). This is probably due to a difference in the kind of patients hospitalized. The nutritional status was worse in patients suffering from infectious disease, stroke, dementia and traumatic injuries, and, conversely, better in patients suffering from cardiopathy, metabolic and gastro-intestinal (except cancerous) diseases (p < 0.0001). Prospective analysis showed that duration of hospitalization was the only variable found to be linked to an improvement of nutritional status. The MNA is a rapid, effective and cheap tool for the assessment of nutritional status and moreover for evaluation of the mortality risk of patients admitted into AC and SAC.