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Nitrogen balance: an adequate treatment prescription index for children on haemofiltration.

We studied 12 children (10.6 +/- 2.5 years; 21 +/- 4.8 kg body weight) with end-stage renal disease on chronic haemofiltration prescribed using a urea kinetic model. After 12 months, urea generation rate, protein catabolic rate and nitrogen balance were assessed in each patient. Pre-treatment BUN was adequate in all 12 patients but in three nitrogen balance and growth rate were unsatisfactory. These three children were studied for a second year in which plasma water cleared/week was increased; during this year a significant increase in nitrogen balance and growth rate was obtained.