Serial quantitative diffusion tensor MRI of the term neonates with hypoxic-ischemic encephalopathy (HIE)

Area of Science:

• Neuroimaging
• Neonatal Neurology
• Biomedical Engineering

Background:

• Hypoxic ischemic encephalopathy (HIE) is a major cause of neonatal brain injury.
• Early detection of HIE-related brain damage is crucial for timely intervention.
• Diffusion tensor imaging (DTI) offers insights into white matter microstructure.

Purpose of the Study:

• To investigate serial changes in fractional anisotropy (FA) and mean diffusivity (MD) in neonates with mild to moderate HIE.
• To compare these microstructural changes with age-matched controls.
• To assess the correlation between DTI metrics and neurodevelopmental outcomes.

Main Methods:

• Serial DTI scans were performed on term neonates with HIE (mild n=7, moderate n=10) and controls (n=7) at two time points: within 7 days of birth and at 3 months of age.
• Two-way analysis of variance was used to compare FA and MD changes over time between groups.
• Neurodevelopmental outcomes were assessed at the second DTI scan.

Main Results:

• Significant differences in age-related FA increase were observed in the anterior limb of the internal capsule and periventricular white matter (p < 0.05).
• Significant differences in age-related MD decrease were noted in the caudate nuclei and temporal white matter (p < 0.05).
• A significant positive correlation was found between FA values and neurodevelopmental outcomes.

Conclusions:

• Abnormal FA and MD values in neonates with HIE can aid in early and accurate assessment of microstructural damage.
• These DTI-derived metrics show potential predictive value for long-term neurofunctional outcomes in HIE.
• Serial DTI is a valuable tool for monitoring brain development and injury in neonates with HIE.