Avaliação do impacto de um programa de educação nutricional sobre a adesão à dieta hipoproteica em pacientes com doença renal crônica em tratamento conservador

Abstract

Nondialyzed chronic kidney disease (CKD) patients are normally counseled to follow a low protein and sodium diet. Nationals and internationals surveys have shown a low adherence to such diet. In addition, it has been also demonstrated that maintaining a low protein and sodium intake is difficult, because it requires important changes in eating habits. The objective of the present study was to evaluate the impact of a nutritional education program on the adherence to the low protein diet in CKD patients being followed in a conservative outpatient clinic. Study design: clinical, randomized, controlled and prospective essay (follow-up of 5 ±1.5 months (mean ± SD)). Eighty five nondialyzed CKD patients, under treatment in two CKD outpatient clinics from Pedro Ernesto University Hospital, were included in this study. These patients were randomized in two groups: Intervention (n=39) and Control (n=46). The patients of the Intervention Group were submitted to a nutritional education program, besides the low protein diet prescription (0.6 to 0.75 g/kg/day). The patients from the Control Group were submitted only to the low protein diet prescription (0.6 to 0.75 g/kg/day). The evaluation of the adherence was done by estimating the protein intake from the 24 hour food recall. The adherence criterion adopted was to present, at the end of the study, a reduction of at least 20% of the initial protein intake. The nutritional and laboratorial assessments were made at the beginning and at the end of the follow-up period. The anthropometric parameters assessed were body weight, height, triceps , biceps , subscapulars and suprailiac s skinfolds thicknesses and waist s and arm s circumferences. The laboratorial parameters included plasma creatinine, urea, potassium, phosphate, glucose and albumin and 24 hour urine s sodium and urea. In the total studied sample, 51.8% of the patients were male, with an mean age of 63.4 ± 11.0 years, mean BMI indicating overweight (28.8 ±5.4 kg/m²) and a mean glomerular filtration rate (GFR) of 32.6 ±12.2 mL/mim/1,73m². The main characteristics at the beginning of the follow-up were not different between Intervention and Control Groups. Both groups presented an improvement on the laboratorial and anthropometrical parameters, with significant reduction of plasma urea and glucose in the Control Group (P < 0.05 vs baseline) and BMI in both groups (P < 0.05 vs baseline). After the follow-up period, the Intervention and Control Groups showed a significant decrease in the protein intake (0.62 ±0.2 vs 0.77 ±0.26 g/kg/day, respectively). The sodium intake did not significantly change in both groups at the beginning and end of the study. A higher degree of adherence to the low protein diet was observed in Intervention Group (74.4%) than in Control Group (47.8%) (P < 0.05). The multivariate logistic regression analysis revealed that belonging to the Intervention Group and male gender were significantly associated with Adherence (P < 0.05), even after controlling to others tested variables. Based on these findings, it can be concluded that the nutritional education program was an effective tool to reduce the protein intake of nondialyzed CKD patients, as it has leaded to an improvement in the adherence to the low protein diet, and promoted an amelioration of anthropometric and laboratorial parameters.