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Updated: Aug 31, 2026

A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
10:30

A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy

Published on: May 16, 2015

Intellectual deficits after transient tyrosinemia in the term neonate

P Mamunes, P E Prince, N H Thornton

    Pediatrics
    |May 1, 1976
    PubMed

    Insights

    Prolonged transient neonatal tyrosinemia (TNT) may harm infant brain development, leading to learning disabilities. Early detection and prevention are crucial for affected newborns.

    Area of Science:

    • Neonatal neurology
    • Developmental pediatrics

    Background:

    • Transient neonatal tyrosinemia (TNT) is a condition affecting newborns.
    • High-protein formulas and vitamin C deficiency are potential causes of TNT.

    Purpose of the Study:

    • To assess the long-term neurodevelopmental effects of prolonged TNT in term infants.
    • To investigate the relationship between TNT duration and cognitive outcomes.

    Main Methods:

    • 15 term infants with prolonged TNT underwent psychometric evaluations.
    • Cognitive assessments included the McCarthy Scale of Children's Abilities and the Illinois Test of Psycholinguistic Ability.
    • A control group was used for comparison.

    Main Results:

    • Infants with TNT scored significantly lower on cognitive tests compared to controls.
    • Lower scores on the McCarthy Scale (77.1 vs. 92, P = .008) and ITPA (92.3 vs. 109.9, P = .002).
    • Cognitive performance correlated inversely with the duration of TNT.

    Conclusions:

    • Prolonged TNT may lead to specific learning disabilities, though not necessarily intellectual disability.
    • Further research is needed to determine TNT frequency in infants fed high-protein formulas.
    • Preventive strategies for TNT should be developed.

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