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Maternal phenylketonuria: report from the United Kingdom Registry 1978-97

P J Lee1, D Ridout, J H Walter

  • 1The Charles Dent Metabolic Unit, The National Hospital for Neurology & Neurosurgery, London, UK. philip.lee@uclh.org

Archives of Disease in Childhood
|January 25, 2005
PubMed

Insights

Starting a phenylalanine-restricted diet before conception significantly improves outcomes for pregnant women with phenylketonuria (PKU). Early dietary intervention in PKU pregnancies prevents developmental issues and congenital heart disease in offspring.

Area of Science:

  • Maternal-fetal medicine
  • Metabolic disorders
  • Genetics

Background:

  • Maternal phenylketonuria (PKU) poses significant risks to fetal development, including facial dysmorphism, microcephaly, intrauterine growth retardation, developmental delays, and congenital heart disease (CHD).
  • Effective management of maternal PKU is crucial for preventing adverse pregnancy outcomes.

Purpose of the Study:

  • To evaluate the impact of a phenylalanine-restricted diet in pregnant women with PKU on offspring development and health.
  • To determine the optimal timing for initiating dietary intervention during pregnancy.

Main Methods:

  • A retrospective analysis of pregnancies in women with PKU in the United Kingdom (1978-1997) using data from the UK PKU Registry.
  • Examined the effects of pre-conception versus in-pregnancy initiation of a phenylalanine-restricted diet on birth weight, head circumference, incidence of CHD, and developmental/intelligence quotients at 4 and 8 years.

Main Results:

  • Pregnancies with pre-conception dietary intervention (n=110) showed significantly better outcomes: higher birth weight (3160g vs 2818g), larger head circumference (33.6cm vs 32.7cm), higher 4-year DQ (108.9 vs 96.8), higher 8-year IQ (103.4 vs 86.5), and lower CHD incidence (2.4% vs 17%) compared to those treated during pregnancy (n=91).
  • Metabolic control achieved by 12-16 weeks of gestation was identified as critical for influencing pregnancy outcomes.

Conclusions:

  • The adverse effects associated with maternal PKU syndrome are largely preventable with a phenylalanine-restricted diet.
  • Early initiation of a phenylalanine-restricted diet, ideally before conception or as early as possible in pregnancy, is essential for women with PKU and their healthcare providers to be aware of these risks and recommendations.
Abstract

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