Prenatal Opioid Exposure and Risk for Adverse Brain and Motor Outcomes in Infants Born Premature

Area of Science:

• Neonatal neuroscience
• Developmental pediatrics
• Neuroimaging

Background:

• Prenatal opioid exposure (POE) is a growing concern impacting infant neurodevelopment.
• Preterm infants are particularly vulnerable to brain injury and developmental challenges.
• Understanding the specific effects of POE on preterm infant brain development is crucial.

Purpose of the Study:

• To investigate the association between prenatal opioid exposure (POE) and brain magnetic resonance imaging (MRI) biomarkers in preterm infants.
• To compare neurodevelopmental outcomes, assessed by the Bayley Scales of Infant and Toddler Development-III, in preterm infants with and without POE.
• To determine if brain imaging findings mediate the relationship between POE and neurodevelopmental scores.

Main Methods:

• A cohort of 395 preterm infants (≤32 weeks gestational age) underwent term-equivalent brain MRI and neurodevelopmental testing at 2 years corrected age.
• Prenatal opioid exposure (POE) data was collected for all infants.
• Analysis included assessment of total/regional brain volumes, severe punctate white matter lesions (PWMLs), and multivariable logistic regression.

Main Results:

• Infants with POE showed significantly higher rates of severe punctate white matter lesions (PWMLs) compared to unexposed infants (17.1% vs 3.9%, P=.002).
• Mediation analysis suggested POE has a direct adverse effect on white matter, not solely mediated by preterm birth.
• POE was associated with significantly lower scores on the Bayley Scales of Infant and Toddler Development-III Motor subscale (-6.2 points).

Conclusions:

• Prenatal opioid exposure (POE) is associated with an increased risk of severe white matter lesions in preterm infants, likely through a direct mechanism.
• POE is linked to poorer motor development outcomes in early childhood.
• Further research is needed to elucidate the long-term consequences of POE on neurodevelopment in this vulnerable population.