Comparação do Gasto energético de repouso obtido pela calorimetria indireta com as equações de predição em pacientes idosos em tratamento crônico de hemodiálise

Abstract

Objectives: The daily energy requirements of hemodialysis (HD) patients can be calculated by multiplying the resting energy expenditure (REE) by the physical activity level. Up to now, there are no studies assessing whether prediction equations are accurate to assess the REE in elderly HD. We aimed to evaluate the agreement between the REE obtained by indirect calorimetry and the prediction equations of Harris&Benedict, Schofield and World Health Organization 1985 (WHO 1985) in elderly patients on hemodialysis (HD). Design, setting and participants: This is a cross-sectional study. The REE of 57 elderly non-institutionalized patients (> 60 years) on HD was measured by indirect calorimetry and compared with the prediction equations of Harris&Benedict, Schofield and WHO 1985. The agreement between the REE and the equations were assessed by the intraclass correlation coefficient and by the Bland-Altman plot analysis. Results: The REE estimated by the 3 equations were significantly higher than that obtained by the indirect calorimetry. A moderate degree of reproducibility was observed between the indirect calorimetry and the equations. Overestimation was the main error observed, being present in half of the patients. Underestimation was seen in approximately 10% of the patients. Conclusion: These 3 equations performed similarly when estimating the REE. They can be used to calculate the REE in elderly HD, but clinicians should be aware of possible errors, mainly when prediction equations underestimate the measured REE.