The German Collaborative Study of Children treated for Phenylketonuria is an interdisciplinary, multicenter study of the Departments of Pediatrics of the Universities of Berlin, Dusseldorf, Gottingen, Hamburg, Heidelberg, Munchen. Munster and Ulm Burgard P, Armbruster M, Schmidt E, Rupp A. Psychopathology of patients treated early for phenylketonuria: results of the German collaborative study of phenylketonuria. Acta Pzdiatr 1994;(Suppl407): 108-10. Stockholm. ISSN 0803-5326At the age of 13 years, 60 adolescents, suffering from phenylalaninemia due to hydroxylase deficiency, and their mothers were simultaneously investigated with a standardized psychiatric interview in order to determine the adolescents' psychiatric status. Forty symptoms related to emotional disorders, antisocial anci conduct disorders, hyperkinetic syndromes, and specific symptoms like psychophysiological pains, enuresis, encopresis, tics, stereotypies, and eating disorders were examined. Severity level was rated as undisturbed, mild, moderate, and severe disturbance. Comparison with a representative sample of 191 age mates revealed a double rate of moderate disturbances for the PKU sample. There was no association between severity level and sex as well as mean phenylalanine level during the first 13 years of the patients' lives. No PKU specific diagnosis could be determined. WISC-R-IQ below 90 was associated with a threefold risk of more severe disturbance and patients with more than three adverse familial circumstances had a 50% chance of getting a psychiatric diagnosis. It is concluded that the observed disturbances result from stress associated more with the chronic condition than with the increased phenylalanine level.
P Burgard, Universitats-Kinderklinik, PKU-Verbundstudie, Im Neuenheimer Feld 150, 69120 Heidelberg, FGRBehavioral and emotional disorders were reported by Folling in 1934 in the first article on phenylketonuria (PKU), where he described patients as anxious, shy, angry, irritated, unsociable, and showing temper tantrums and catatonia (1). The studies which have appeared since then can be divided into two main groups. First, research of untreated patients reporting mainly extrovert clinical psychiatric symptoms (aggressiveness, hyperactivity, unpredictable behavior) but also introvert symptoms, such as anxiety, depression and social withdrawal. These symptoms were explained largely by reference to biochemical consequences of elevated levels of phenylalanine and its metabolites (2).Because in all cases psychiatric disturbances occurred together with severe mental retardation, it was questioned if the symptoms were a consequence of the mental impairment. It was demonstrated that even in untreated patients, introduction of a phenylalanine reduced diet alleviated behavioral problems, but there were also data showing that behavioral therapy might be more effective than a low phenylalanine diet in reducing behavioral disturbances (3). Second, studies in treated patients also reported introvert and extrovert symptoms as well as hyper...