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Kai-Ming Liu, MS; Tze-Tze Liu, PhD; Ni-Chung Lee, MD; Ling-Yee Cheng, MS; Kwang-Jen Hsiao, PhD; Dau-Ming Niu, MD, PhD

Arch Neurol. 2008;65(3):387-392.

Objective  To report the long-term results of early initiation of treatment of 6-pyruvoyl-tetrahydropterin synthase (PTPS) deficiency.

Design  Between 1988 and 2000, 12 newborns with PTPS deficiency who underwent early treatment at our hospital were identified. All patients received tetrahydrobiopterin replacement in a daily dosage between approximately 2 and 4 mg/kg. The dosages of levodopa replacement were 10 to 15 mg/kg/d, which is considerably higher than the typically recommended dosages of less than 7 mg/kg/d for patients aged younger than 2 years and 8 to 10 mg/kg/d for patients aged 2 years or older. Replacement with 5-hydroxytryptophan varied widely among patients.

Setting  Taipei Veterans General Hospital.

Patients  Twelve newborns.

Interventions  Treatment with tetrahydrobiopterin, levodopa, and 5-hydroxytryptophan.

Main Outcome Measure  IQ score.

Results  The mean (SD) IQ score of our PTPS-deficient patients was 96.7 (9.7; range 86-119), which is considerably higher than previous reports of other populations of PTPS-deficient patients. All patients reached a normal IQ on high daily dosages of levodopa replacement, without developing apparent long-term levodopa-induced adverse effects. We also observed a correlation between long-term IQ score and genotype, birth weight, and age at initiation of treatment.

Conclusions  An effective newborn screening referral program and early initiation of appropriate therapy preserved the IQ scores of PTPS-deficient patients.

Author Affiliations: Institute of Clinical Medicine, School of Medicine (Mr K.-M. Liu and Dr Niu) and Taipei Veterans General Hospital and Yang-Ming University Genome Research Center (Drs T.-T. Liu and Hsiao), National Yang-Ming University; Department of Pediatrics, Taipei Veterans General Hospital (Drs Lee and Niu); and Department of Rehabilitation, Taipei Veterans General Hospital (Ms Cheng), Taipei, Taiwan.

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