Effects of an amino acid solution enriched with either branched chain amino acids or ornithine-α-ketoglutarate on the postoperative intracellular amino acid concentration of skeletal muscle

Abstract

Patients undergoing elective cholecystectomy provide a highly reproducible model of the effects of trauma on intermediary metabolism. Three parenteral nutrition regimens were given to groups of eight such patients. An isonitrogenous total parenteral nutrition, including a commercially available amino acid solution, an amino acid solution enriched with branched chain amino acids or one supplemented with ornithine-α-ketoglutarate, was given after operation. The intra cellular free amino acid concentrations of skeletal muscle were determined in tissue specimens obtained before operation and on the third postoperative day using a percutaneous needle biopsy technique. The mean(s.e.m.) decrease in the concentrations of free intracellular glutamine on the third postoperative day was less pronounced (P < 0·05) in the ornithine-α-ketoglutarate group (18·8(7·5) per cent) than in the control group (39·4(5·1)per cent) or the branched chain amino acid group (45·3(6·1) per cent). In conclusion, in the immediate postoperative period total parenteral nutrition supplemented with ornithine-α-ketoglutarate countered the decline in the muscle free glutamine. No difference in this parameter was seen between the control group and the branched chain amino acid group.