Related Experiment Video
Updated: Apr 19, 2026
Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy
Published on: October 28, 2022
White matter tract integrity and developmental outcome in newborn infants with hypoxic-ischemic encephalopathy
An N Massaro1, Iordanis Evangelou, Ali Fatemi
1Division of Neonatology, Children's National Medical Center, Washington, DC, USA; Department of Pediatrics, The George Washington University School of Medicine, Washington, DC, USA.
Insights
Diffusion tensor imaging of the corpus callosum (CC) and corticospinal tract (CST) in newborns with encephalopathy after hypothermia can predict developmental outcomes. Microstructural integrity of these white matter tracts is crucial for cognitive and motor development.
Area of Science:
- Neuroimaging
- Developmental Neuroscience
- Neonatal Neurology
Background:
- Therapeutic hypothermia is standard care for neonatal encephalopathy.
- Early prediction of neurodevelopmental outcomes is critical for intervention.
- Diffusion tensor imaging (DTI) assesses white matter microstructure.
Purpose of the Study:
- To investigate the relationship between DTI measures of the corpus callosum (CC) and corticospinal tract (CST) and neurodevelopmental outcomes in infants treated with hypothermia.
- To evaluate the utility of DTI tractography for early detection of perinatal brain injury.
Main Methods:
- DTI was performed on encephalopathic newborns post-hypothermia.
- Tractography was used to segment CC and CST.
- Multiple regression analyses correlated DTI metrics (fractional anisotropy, diffusivities) with Bayley Scales of Infant Development (MDI, PDI) at 15 and 21 months.
Main Results:
- Lower fractional anisotropy in CC and CST correlated with lower MDI and PDI, respectively.
- Higher CC axial diffusivity was associated with better MDI.
- Increased CST radial diffusivity was linked to poorer PDI.
Conclusions:
- Impaired CC and CST microstructural organization predicts poorer cognitive and motor outcomes in infants with neonatal encephalopathy.
- DTI tractography offers a reliable method for early assessment of perinatal brain injury and neurodevelopmental prognosis.
Aim:
To determine whether corpus callosum (CC) and corticospinal tract (CST) diffusion tensor imaging (DTI) measures relate to developmental outcome in encephalopathic newborn infants after therapeutic hypothermia.
Method:
Encephalopathic newborn infants enrolled in a longitudinal study underwent DTI after hypothermia. Parametric maps were generated for fractional anisotropy, mean, radial, and axial diffusivity. CC and CST were segmented by DTI-based tractography. Multiple regression models were used to examine the association of DTI measures with Bayley-II Mental (MDI) and Psychomotor Developmental Index (PDI) at 15 months and 21 months of age.
Results:
Fifty-two infants (males n=32, females n=20) underwent DTI at median age of 8 days. Two were excluded because of poor magnetic resonance imaging quality. Outcomes were assessed in 42/50 (84%) children at 15 months and 35/50 (70%) at 21 months. Lower CC and CST fractional anisotropy were associated with lower MDI and PDI respectively, even after controlling for gestational age, birth weight, sex, and socio-economic status. There was also a direct relationship between CC axial diffusivity and MDI, while CST radial diffusivity was inversely related to PDI.
Interpretation:
In encephalopathic newborn infants, impaired microstructural organization of the CC and CST predicts poorer cognitive and motor performance respectively. Tractography provides a reliable method for early assessment of perinatal brain injury.
