[Investigation on the postoperative behavior of plasma amino acids in metabolically healthy patients. 1st communication (author's transl)].

In 12 patients before and after vaginal hysterectomy the plasma amino acid levels were determined. Without parenteral feeding the changes in plasma amino acid patterns can be explained by effects of operation and anaesthesia alone. The branched-chain amino acids decreased after operation. The following rise was never exceeding the control level. Even without substitution the concentrations of phenylalanine, methionine, and glutamic acid were increased. Tyrosine concentration remained within normal levels while cystine fell significantly.