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Total brain white matter is a major determinant of IQ in adolescents born preterm

Gemma B Northam1, Frédérique Liégeois, Wui K Chong

  • 1Institute of Child Health, University College London, London, United Kingdom.

Annals of Neurology
|March 11, 2011
PubMed

Insights

Preterm birth is linked to lower intelligence and academic success in adolescents due to reduced white matter (WM) volume. Early interventions to protect WM are crucial for better long-term outcomes in preterm infants.

Area of Science:

  • Neuroscience
  • Developmental Pediatrics
  • Radiology

Background:

  • White matter (WM) abnormalities in preterm infants are associated with early developmental delays.
  • The long-term cognitive impact of these abnormalities in adolescence requires further investigation.

Purpose of the Study:

  • To examine the association between markers of brain injury, specifically white matter (WM) reduction, and intellectual outcomes in adolescents born preterm.
  • To assess the impact of WM reduction on academic achievement and behavior.

Main Methods:

  • A cohort of 79 adolescents (49 preterm, 30 term-born controls) were assessed at a mean age of 16 years.
  • Data included brain MRI scans, intelligence quotient (IQ) scores, educational attainments, and behavioral assessments.
  • Measures of WM reduction included total volume, corpus callosum (CC) area, and ventricular dilatation.

Main Results:

  • Adolescents born preterm showed reduced WM volume and IQ, irrespective of brain injury presence at birth.
  • Total WM volume and CC area explained 70% of IQ variance in the preterm group.
  • Significant correlations were observed between WM reduction and academic/behavioral outcomes.

Conclusions:

  • Preterm birth has lasting effects on cognition, behavior, and academic success, primarily due to global white matter reduction.
  • Early therapeutic interventions aimed at preventing WM injury and promoting its development are essential for preterm neonates.
Abstract

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