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Methadone exposure in utero: developmental status at one and two years of age

K Kaltenbach, L J Graziani, L P Finnegan

    Pharmacology, Biochemistry, and Behavior
    |January 1, 1979
    PubMed

    Insights

    Infants exposed to methadone in utero showed lower cognitive scores at 12 months but no significant differences at 24 months compared to controls. Neurological exams were normal for all infants.

    Area of Science:

    • Pediatrics
    • Developmental Psychology
    • Pharmacology

    Background:

    • Prenatal exposure to opioids, such as methadone, can impact infant development.
    • Understanding the long-term neurodevelopmental effects of in utero methadone exposure is crucial for clinical practice.

    Purpose of the Study:

    • To assess and compare the developmental status of infants exposed to methadone in utero versus non-drug exposed infants at 12 and 24 months of age.
    • To identify specific areas of cognitive or neurological function that may be affected by prenatal methadone exposure.

    Main Methods:

    • Longitudinal study assessing 12-month-old and 24-month-old infants.
    • Utilized the Bayley Scale of Mental Development and neurological examinations.
    • Compared developmental outcomes between drug-exposed and control groups.

    Main Results:

    • All infants exhibited normal neurological assessments.
    • At 12 months, drug-exposed infants had significantly lower Mental Developmental Index (MDI) scores than controls, though both were within the normal range.
    • At 24 months, no significant difference in MDI was observed between groups, but specific item failure rates differed.

    Conclusions:

    • While short-term cognitive function (MDI) may be affected by prenatal methadone exposure, catch-up development may occur by 24 months.
    • Specific item performance differences suggest subtle, persistent effects that warrant further investigation.
    • Findings contribute to understanding the neurodevelopmental trajectory following in utero methadone exposure.

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