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Gestational age at preterm birth in relation to corpus callosum and general cognitive outcome in adolescents

Ana Narberhaus1, Dolors Segarra, Xavier Caldú

  • 1Department of Psychiatry and Clinical Psychobiology, University of Barcelona, Spain.

Journal of Child Neurology
|July 21, 2007
PubMed

Insights

Extremely preterm infants (born ≤27 weeks) show significant corpus callosum and white matter reductions, impacting intelligence quotient (IQ). Later preterm birth (31-33 weeks) may also correlate with lower IQ without structural brain changes.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Pediatric Neurology

Background:

  • Prematurity is linked to corpus callosum abnormalities and impaired cognitive function.
  • Gestational age at birth is a critical factor influencing neurodevelopmental outcomes.

Purpose of the Study:

  • To investigate the relationship between gestational age, corpus callosum development, and intelligence quotient (IQ) in adolescents born preterm.
  • To identify specific gestational age thresholds associated with corpus callosum anomalies and cognitive deficits.

Main Methods:

  • A cohort of 64 preterm adolescents (gestational age ≤36 weeks) was categorized into four groups based on gestational age.
  • Structural brain imaging (corpus callosum and white matter volume) and IQ assessments were performed.
  • Comparison was made with a control group of 53 adolescents born at term.

Main Results:

  • Adolescents born at ≤27 weeks gestational age exhibited generalized corpus callosum reduction, decreased white matter volume, and low Full-Scale IQ.
  • Infants born between 28-30 weeks showed reduced IQ and splenium corpus callosum size, but not white matter volume.
  • Those born between 31-33 weeks had normal brain structure but lower IQ, while those born 34-36 weeks showed no significant differences.
  • Significant correlations were observed between specific corpus callosum subregions and gestational age.

Conclusions:

  • Gestational age is crucial for brain structural and functional outcomes in preterm infants.
  • Infants born at ≤27 weeks gestational age are at high risk for long-term corpus callosum anomalies, white matter deficits, and intellectual disability.

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