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  • Title: Total body nitrogen in children with chronic renal failure and short stature.
    Author: Baur LA, Knight JF, Crawford BA, Reed E, Roy LP, Allen BJ, Gaskin KJ.
    Journal: Eur J Clin Nutr; 1994 Jun; 48(6):433-41. PubMed ID: 7925226.
    Abstract:
    OBJECTIVE: To directly assess the body protein content of children with chronic renal failure (CRF) and short stature. SETTING: A tertiary referral paediatric hospital. SUBJECTS: There were: (i) 17 patients (10 male, nine pre-pubertal; mean age 12.90 +/- 3.20 years) with CRF and height standard deviation (SD) score < -2.00, and (ii) 43 normal children (18 male, 27 pre-pubertal; mean age 10.34 +/- 3.34 years). INTERVENTIONS: CRF patients had the following measurements: anthropometry, total body nitrogen (TBN) by neutron capture analysis, 4 day weighed food record and serum albumin levels. Control subjects had TBN and anthropometric measurements only. RESULTS: Although older than the controls, the CRF patients had significantly lower TBN values (645 +/- 265 vs 930 +/- 365 g, P < 0.01). Mean values for TBN and TBN/height (percentages of expected) in the CRF patients were significantly reduced to 54% and 63% respectively, when predicted from age. However, their TBN predicted from height was 100% of expected. %TBN (predicted from age) correlated significantly with height SD score (r = 0.79), weight SD score (r = 0.87), upper arm muscle area percentile (r = 0.62) and serum albumin (r = 0.62). Mean oral energy and protein intakes were 65% and 172% of recommended dietary intake respectively. CONCLUSIONS: Children with CRF and short stature are significantly protein-depleted for age although not for height. Chronic energy deficiency may contribute to impaired protein deposition which, in turn, may be important in the pathogenesis of growth failure in CRF.
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