Association of Early-Life or Term-Equivalent White Matter Injury With Neurodevelopmental Outcomes in Very Preterm Infants.

Background And Objectives: We determined whether white matter injury (WMI) severity and location on early-life vs term-equivalent age (TEA) brain MRI were more strongly associated with 36-month neurodevelopment.

Methods: Very preterm infants were recruited across 3 tertiary NICUs and underwent early-life and TEA MRI. Moderate-severe WMI severity and anterior or posterior location were scored. 36-month neurodevelopmental assessments were completed with Bayley Scales of Infant Development, Third Edition; delay was defined as a composite score <85 points. Multivariable logistic regressions adjusting for birth gestational age, site, infection, retinopathy of prematurity, moderate-severe intraventricular hemorrhage, and antenatal magnesium sulfate were used to determine associations of WMI severity and location at each scan with neurodevelopment.

Results: A total of 393 neonates (postmenstrual age median 27.6, SD 2.3 weeks, 47% female) completed early-life and TEA MRI scans. Cognitive delay was associated with early-life moderate-severe (OR 3.82, 95% CI 1.17-9.14) and anterior (OR 5.47, 95% CI 1.72-17.29) WMI. Motor delay was associated with early-life anterior WMI (OR 3.02, 95% CI 1.12-8.2). These associations were not observed at TEA in multivariable logistic regressions.

Discussion: Moderate-severe and anterior WMI on early-life, but not TEA, MRI were associated with neurodevelopmental outcomes. Early-life MRI may represent a more optimal time point for assessing WMI in very preterm infants.