Association between Diffusion Tensor Imaging Findings and Cognitive Outcomes Following Mild Traumatic Brain Injury: A...

Area of Science:

• Neuroimaging
• Neurology
• Cognitive Neuroscience

Background:

• Mild traumatic brain injury (mTBI) can lead to persistent cognitive deficits.
• Previous diffusion tensor imaging (DTI) studies in mTBI focused on limited brain regions and functions.
• A comprehensive understanding of DTI findings and cognitive outcomes in mTBI is needed.

Purpose of the Study:

• To conduct a meta-analysis exploring the association between DTI findings and cognitive function in mTBI patients.
• To identify specific white matter tracts and DTI metrics related to various cognitive domains post-mTBI.

Main Methods:

• Systematic literature search of PubMed, Web of Science, EMBASE, Medline, and Google Scholar for studies published before October 2019.
• Inclusion of 9 studies comprising 293 mTBI patients.
• Meta-analysis of correlations between DTI metrics (FA, MD/ADC) and cognitive functions.

Main Results:

• Higher fractional anisotropy (FA) in the longitudinal fasciculus, sagittal stratum, cerebellum, and internal capsule associated with better general cognition.
• Higher FA in cerebellar peduncles linked to worse general cognition.
• Higher FA in mesencephalon, anterior corona radiata, forceps major, uncinate fasciculus, cingulum, and genu of corpus callosum related to better memory.
• Higher FA in anterior corona radiata associated with worse attention, processing speed, and working memory.
• Higher mean diffusivity (MD)/apparent diffusion coefficient (ADC) in the external capsule and uncinate fasciculus linked to worse memory and attention/processing speed/working memory, respectively.
• Overall, better white matter integrity (higher FA, lower MD/ADC) may correlate with better cognitive function post-mTBI.

Conclusions:

• White matter integrity, as assessed by DTI, plays a significant role in cognitive outcomes following mTBI.
• Specific white matter tracts show differential associations with general cognition, memory, and executive functions.
• This meta-analysis highlights the potential of DTI as a biomarker for cognitive impairment in mTBI.