Long-Term Brain White Matter Outcomes Following Neonatal Acute Kidney Injury.

Acute kidney injury (AKI) is common among neonates in the intensive care unit and has been linked to abnormal neurodevelopment, yet long-term effects on brain structure remain uncharacterized. In this secondary analysis, we compared brain white matter integrity, measured by fractional anisotropy (FA) on 3T MRI, in children ages 5-12 years born preterm with (n=5) versus without (n=10) a history of neonatal AKI. Contrary to our hypothesis, children with prior neonatal AKI showed higher FA across seven white matter regions in unadjusted analyses. After adjustment for sex, birth weight, and age at MRI, the AKI group retained significantly greater FA in the corticospinal tract (β=0.7, 95% CI 0.09-1.31) and superior frontooccipital fasciculus (β=0.68, 95% CI 0.02-1.34). Because elevated FA may reflect compensatory glial responses rather than improved neurological function, these findings suggest neonatal AKI may have lasting, complex effects on white matter microstructure. Larger studies pairing neuroimaging with neurocognitive assessment are needed.