Lee (1969) proposed a formula for clinical nitrogen balance that depended principally on the measurement of 24-hr urinary urea nitrogen excretion and equating this to 80°/ of the total urinary nitrogen excretion. The remaining 20Y. was assumed to consist of ammonia, purines, creatinine, alpha amino nitrogen and other unidentified nitrogen. Rarely, there is a correction to be made should any significant proteinuria be present. MethodEleven patients all with normal renal function who had been treated by elective vagotomy and pyloroplasty were studied over a' 6-day post-operative period when they received complete intravenous nutrition only. Complete nitrogen balance studies were undertaken inclusive of measuring faecal and nasogastric aspirate nitrogen. All patients received iso-caloric and iso-nitrogenous regimes and the calories were derived from identical sources (Hartley and Lee, 1975). Six patients received a crystalline L-amino acid preparation, Vamin, which contains all the essential amino acids and a balanced nonessential amino acid content. The other five patients received a casein hydrolysate, Aminosol 10Y., which also contains all the essential amino acids, but in addition to non-essential amino acids contains an appreciable proportion of small molecular weight peptides and some ammonia.The urinary nitrogen constituents measured were: total nitrogen (Micro-Kjeldahl method), ammonia,-urea, creatinine and, by subtraction from the total nitrogen, unidentified nitrogen.
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