Factors associated with neurodevelopment in preterm infants with systematic inflammation

Area of Science:

• Neonatal Medicine
• Neuroscience
• Inflammation Research

Background:

• Systemic inflammation in preterm infants is a suspected cause of adverse neurodevelopment.
• Previous studies suggest a link, but specific biomarkers and neurophysiological correlates require further investigation.

Purpose of the Study:

• To investigate the association between systemic inflammation and neurodevelopmental impairment in preterm infants.
• To identify biomarkers and neurophysiological measures during inflammation that correlate with poor neurodevelopmental outcomes.

Main Methods:

• Prospective cohort study of preterm infants (born <30 weeks gestation or <1250g birth weight).
• Infants categorized into control (no inflammation) and inflammation groups.
• Collected blood/CSF for inflammatory markers, performed amplitude-integrated electroencephalography (aEEG), brain MRI, and Bayley Scales of Infant and Toddler Development III (Bayley-III) at 18 months corrected age.

Main Results:

• Infants with systemic inflammation showed higher rates of white matter injury, lower brain functional maturation, and smaller head circumference.
• Seizure spikes on aEEG and elevated immature neutrophil/total neutrophil (I/T) ratios and IL-1 beta in cerebrospinal fluid at symptom onset correlated with aEEG measures.
• Immature neutrophil (I/T) ratio, CRP, TNF-α, white matter injury, head circumference, and seizure spikes on aEEG were associated with Bayley-III scores at 18 months corrected age.

Conclusions:

• Systemic inflammation, often from clinical infection or necrotizing enterocolitis (NEC), is associated with neurodevelopmental impairment in preterm infants.
• Specific indicators such as seizure spikes on aEEG, elevated I/T ratio, CRP, and plasma TNF-alpha during inflammatory episodes are linked to poor neurodevelopmental outcomes.