Geriatric Nutrition

Evaluating pet foods: how confident are you when you recommend a commercial pet food?

The safety, adequacy, and efficacy of pet foods are important considerations for veterinarians and consumers. Manufacturers of pet foods in the United States are required to comply with multiple regulations from a variety of governmental and state agencies to market foods in the public sector. However, consumers and veterinarians may not be aware of the multiple systems in place that help ensure the safety and adequacy of foods for their pets. Since the veterinarian occupies a key role to make recommendations to consumers regarding pet foods, it is the purpose of this article to review the processes of pet food manufacturing, as well as the processes that have been developed to help ensure safety and adequacy of pet foods in the United States.

Frequency of going outdoors predicts long-range functional change among ambulatory frail elders living at home

The purpose of the study was to investigate the relationships between frequency of going outdoors and subsequent functional and psychosocial changes over a 20-month period. Data were collected from community-dwelling 107 frail elders who could walk independently but who still needed some assistance to live on their own. Functional and psychosocial status at baseline and follow-up were compared among three groups defined by the frequency of going outdoors: (1) four or more times a week, (2) one to three times a week and (3) less than once a week. At baseline, elders going outdoors more often were less functionally impaired, more socially active, and less depressed than elders going outdoors less often. There was a significant difference in change over time of activities of daily living (ADLs) (p=0.002) among the three groups, even when controlling for baseline differences, and the scores of those who went outdoors almost daily were least likely to decline. More of those going outdoors four or more times a week at baseline were still living at home at follow-up than those in the other two groups (p=0.048). These results suggest that the frequency of going outdoors can predict changes in ADLs over at least a 20-month period.

Bedside Estimation of the Glomerular Filtration Rate in Hospitalized Elderly Patients

AIMS

To evaluate the quality of bedside estimation of glomerular filtration rate (GFR) in hospitalized elderly patients.

METHODS

We evaluated common estimators of GFR in 29 women and 32 men aged 60 and older hospitalized in a geriatric ward: creatinine clearance (CCR), the Cockcroft-Gault formula (CG), the modification of diet in renal disease formula (MDRD), Baracskay formula (BAR), and a newly developed formula derived recently by us (GCM). Inulin clearance (CINU) was used to assess GFR. Exclusion criteria were mental illness and urinary incontinence.

RESULTS

According to Bland and Altman accuracy and precision of all estimators were low and there was an underestimation of actual GFR: CCR 38.9 ml/min; CG 39.7 ml/min; MDRD 19.8 ml/min; BAR 34.0 ml/min, and GCM: 24.7 ml/min. The accuracy and precision of all methods were even lower in patients with a GFR of >90 ml/min and in patients with diabetes. In receiver-operating characteristics (ROC analysis) all formulas were superior to serum creatinine and overall MDRD disclosed the best results in detecting both a GFR of <90 ml/min and <60 ml/min.

CONCLUSIONS

In general, estimation errors are large in an acute care setting. However, formula estimation is clearly superior to serum creatinine and CCR. MDRD gave the best results but may be replaced by the more simple CG and GCM formulas, whereas BAR was inferior.

Factores pronósticos de mortalidad relacionados con el estado nutricional en ancianos hospitalizados

BACKGROUND AND OBJECTIVE

The proportion of elderly patients hospitalized in acute care wards has progressively increased. Patients with a decreased functional status are prone to have malnutrition which negatively affects their prognosis and increases mortality. However, it is unclear whether functional and nutritional status are independent risk factors of mortality.

PATIENTS AND METHOD

We investigated the relation between functional status (Katz index) and nutritional parameters and the incidence of mortality in a prospective, observational study of a cohort of elderly patients who were admitted to an internal medicine ward. Prevalence of malnutrition upon admission and cumulative incidence rate of in-hospital mortality were computed. Also, potential nutritional and functional prognostic factors for in-hospital mortality were identified by multiple logistic regression.

RESULTS

The prevalence of malnutrition in 105 patients included in the cohort was 57.1% (95 percent confidence interval, 47.1% to 66.8%). The incidence of in-hospital mortality was 14.3% (95 percent confidence interval, 8.2% to 22.5%). After adjustment, independent prognostic factors for in-hospital mortality were: a high level of functional dependence (F and G categories of Katz index, OR 6.1; 95 percent confidence interval, 1.4 to 26.3), diminished levels of serum transferrin (each decrement of 1g/L, OR 8.3; 95 percent confidence interval, 3.4 to 20.0) and lymphocyte cell counts (each decrement of 0.5 x 10(9) cells/L, OR 2.3; 95 percent confidence interval, 1.5 to 3.5).

CONCLUSIONS

The prevalence of malnutrition and the incidence of mortality are very high in the hospitalized elderly. In our cohort, decreased serum transferrin and lymphocyte cell count, and an increased level of functional status were associated with an increased risk of in-hospital mortality. Given the high prevalence of geriatric patients in acute care hospitals, strategies to promote an adequate nutrition may reduce the risk of death.