Fallstudien zum Einfluß von Tyrosingaben bei phenylketonurischen Kindern auf kognitive Prozesse

Abstract Eight patients with phenylketonuria and lowprotein nutrition were treated in a dopple blind crossover study for the time of 3 month with 150 mg tyrosine per kg body weight and day and placebo thereafter or vice versa. The concentration of phenylalanine in serum was not influenced by the administration of tyrosine whereas tyrosine in serum markedly increased. Psychological tests were 7 times repeated in monthly intervals. From the study it is to suggest that there is an improvement of the test results caused by an effect of training due to the repeated tests and an additional improvement caused by tyrosine.