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Fetal damage despite low-phenylalanine diet after conception in a phenylketonuric woman

I Smith, M Erdohazi, F J Macartney

    Lancet (London, England)
    |January 6, 1979
    PubMed

    Insights

    Maternal phenylketonuria can cause fetal damage like cardiac defects and microcephaly. Early dietary intervention is crucial, as damage may occur within weeks of conception, even with later treatment.

    Area of Science:

    • Biochemistry
    • Genetics
    • Maternal-Fetal Medicine

    Background:

    • Phenylketonuria (PKU) is an inherited metabolic disorder.
    • Elevated phenylalanine levels during pregnancy pose risks to fetal development.
    • Maternal PKU management typically involves dietary phenylalanine restriction.

    Purpose of the Study:

    • To investigate the timing of fetal damage in maternal phenylketonuria.
    • To assess the efficacy of late-onset dietary intervention in preventing congenital anomalies.

    Main Methods:

    • Case study of a woman with phenylketonuria.
    • Review of pregnancy management and infant outcomes.

    Main Results:

    • Infant born with cardiac defect and microcephaly.
    • Low-phenylalanine diet initiated 5 weeks post-conception (3 weeks after missed period).
    • Fetal damage likely occurred early in gestation.

    Conclusions:

    • Maternal phenylketonuria poses significant risks for fetal development.
    • Damage, including cardiac malformations and microcephaly, may occur very early in pregnancy.
    • Dietary intervention for maternal PKU should be initiated preconceptionally for optimal outcomes.

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