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Final intelligence in late treated patients with phenylketonuria
F K Trefz1, S Cipcic-Schmidt, R Koch
1Klinik für Kinder und Jugendmedizin, Reutlingen, Germany. friedrich-karl.trefz@oe.uni-tuebingen.de
European Journal of Pediatrics
|October 24, 2000
Summary
Late-treated phenylketonuria patients
Area of Science:
- Biochemistry
- Genetics
- Neurology
Background:
- Phenylketonuria (PKU) is a genetic disorder.
- Neonatal screening diagnoses most PKU cases.
- Some patients are diagnosed late, impacting outcomes.
Purpose of the Study:
- To identify factors influencing intellectual outcomes in late-treated PKU patients.
- To assess the impact of treatment initiation age and initial cognitive status.
Main Methods:
- Retrospective analysis of 40 late-treated PKU patients.
- Data included age at diagnosis, treatment start, IQ/DQ scores, and final IQ.
- Neuroimaging and spectroscopy in select cases.
Main Results:
- Late treatment significantly improved IQ (52.7 to 79.0).
- Earlier treatment start and higher initial IQ/DQ correlated with better final intelligence.
- Two untreated patients had normal IQs, suggesting protective factors.
Conclusions:
- Treatment initiation age and baseline intellectual status are key predictors of final IQ in late-treated PKU.
- Genetic factors may influence brain damage severity in PKU.
- Further research into protective mechanisms is warranted.