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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
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Structural abnormalities in thalamo-prefrontal tracks revealed by high angular resolution diffusion imaging predict
Guido I Guberman1,2, Jean-Christophe Houde3, Alain Ptito4
1Department of Neurology and Neurosurgery, Faculty of Medicine, McGill University, Montreal, QC, Canada. guido.guberman@mail.mcgill.ca.
Brain Structure & Function
|January 3, 2020
Summary
This study reveals distinct white matter damage in children with concussion affecting working memory. Thalamo-prefrontal white matter alterations suggest myelin damage, while cingulo-prefrontal changes indicate axonal loss, impacting cognitive function.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Neuroimaging
Background:
- Concussions present diagnostic challenges in children due to varied symptoms and outcomes.
- White matter damage, including inflammation, demyelination, and axonal loss, is a known consequence of concussions.
- Differentiating these neuropathologies in children in vivo remains difficult due to complex white matter structure.
Purpose of the Study:
- To investigate the neuropathology of working memory deficits in pediatric concussion using advanced diffusion imaging.
- To differentiate microstructural white matter changes associated with concussion in children.
Main Methods:
- Utilized diffusion imaging modeling, tractography, and tractometry in 16 concussed and 46 healthy youths.
- Isolated 11 working memory tracts and measured microstructural properties (fractional anisotropy, diffusivities, etc.).
- Analyzed specific tracks connecting thalamus, dorsolateral prefrontal cortex (DLPFC), and anterior-cingulate cortex.
Main Results:
- Identified myelin alterations in three thalamo-prefrontal tracts and axonal loss in one cingulo-prefrontal tract.
- Found that thalamo-prefrontal white matter integrity, not cingulo-prefrontal, correlated with working memory function.
- Reproducible structural differences and tractography reconstructions confirmed findings.
Conclusions:
- This research enhances understanding of concussion-related working memory neuropathology in children.
- Results suggest specific white matter pathways are crucial for working memory post-concussion.
- Findings pave the way for developing neuropathologically informed concussion biomarkers in pediatric populations.
