Antenatal antecedents of cognitive impairment at 24 months in extremely low gestational age newborns

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Jennifer B Helderman1, Thomas M O'Shea, Karl C K Kuban

  • 1Department of Pediatrics (Neonatology), Wake Forest University Health Sciences, Medical Center Blvd, Winston-Salem, NC 27157, USA. jhelderm@wfubmc.edu

Pediatrics
|February 15, 2012
PubMed

Insights

Antenatal factors like placental issues and maternal obesity increase cognitive impairment risk in extremely premature infants. Identifying these risks early is crucial for intervention.

Area of Science:

  • Neonatal Health
  • Developmental Pediatrics
  • Obstetrics

Background:

  • Extremely low gestational age neonates face higher cognitive impairment risks than term infants.
  • Antenatal risk factors for this impairment are understudied.
  • Cognitive impairment was assessed using the Mental Development Index (MDI) of the Bayley Scales of Infant Development, Second Edition (BSID-II), at 24 months corrected age.

Purpose of the Study:

  • To identify antenatal risk factors associated with cognitive impairment in extremely premature neonates.
  • To analyze the relationship between placental characteristics and developmental outcomes.
  • To investigate maternal and demographic factors influencing infant cognitive development.

Main Methods:

  • A multicenter cohort study of 921 infants born before 28 weeks gestation (2002-2004).
  • Placental histology and microbiology were assessed.
  • Maternal interviews and medical record reviews were conducted.
  • Infant cognitive function was evaluated using BSID-II at 24 months corrected age.
  • Multinomial logistic models were employed to determine odds ratios.

Main Results:

  • 11% of infants had an MDI <55, and 11% had an MDI between 55-69.
  • No association was found between placental microorganisms and developmental delay.
  • Strongest predictors for MDI <55 included fetal vessel thrombosis (OR 3.1), maternal BMI >30 (OR 2.0), maternal education ≤12 years (OR 3.4), nonwhite race (OR 2.2), low birth weight z-score (OR 2.8), and male gender (OR 2.7).

Conclusions:

  • Antenatal factors significantly predict cognitive impairment in extremely premature infants.
  • Placental thrombosis, severe fetal growth restriction, and maternal obesity are key risk indicators.
  • These findings highlight the importance of antenatal risk assessment for optimizing outcomes in preterm infants.
Abstract

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