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Neuropsychological Outcome and Diffusion Tensor Imaging in Complicated Versus Uncomplicated Mild Traumatic Brain Injury

1Department of Psychiatry, University of British Columbia, Vancouver, Canada.
2Psychiatry Neuroimaging Laboratory, Brigham Women's Hospital, Harvard Medical School, Boston, MA, USA.
Public Library of Science
Publication Date:
PLoS One
Volume Number:
Issue Number:
PLoS One. 2015 Apr 27;10(4):e0122746.
PubMed ID:
Appears in Collections:
P41 EB015902/EB/NIBIB NIH HHS/United States
200903MOP-200377-BSB-CAAA-161276//Canadian Institutes of Health Research
Generated Citation:
Panenka W.J., Lange R.T., Bouix S., Shewchuk J.R., Heran M.K.S., Brubacher J.R., Eckbo R., Shenton M.E., Iverson G.L. Neuropsychological Outcome and Diffusion Tensor Imaging in Complicated Versus Uncomplicated Mild Traumatic Brain Injury. PLoS One. 2015 Apr 27;10(4):e0122746. PMID: 25915776. PMCID: PMC4411162.
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This study examined whether intracranial neuroimaging abnormalities in those with mild traumatic brain injury (MTBI) (i.e., "complicated" MTBIs) are associated with worse subacute outcomes as measured by cognitive testing, symptom ratings, and/or diffusion tensor imaging (DTI). We hypothesized that (i) as a group, participants with complicated MTBIs would report greater symptoms and have worse neurocognitive outcomes than those with uncomplicated MTBI, and (ii) as a group, participants with complicated MTBIs would show more Diffusion Tensor Imaging (DTI) abnormalities. Participants were 62 adults with MTBIs (31 complicated and 31 uncomplicated) who completed neurocognitive testing, symptom ratings, and DTI on a 3T MRI scanner approximately 6-8 weeks post injury. There were no statistically significant differences between groups on symptom ratings or on a broad range of neuropsychological tests. When comparing the groups using tract-based spatial statistics for DTI, no significant difference was found for axial diffusivity or mean diffusivity. However, several brain regions demonstrated increased radial diffusivity (purported to measure myelin integrity), and decreased fractional anisotropy in the complicated group compared with the uncomplicated group. Finally, when we extended the DTI analysis, using a multivariate atlas based approach, to 32 orthopedic trauma controls (TC), the findings did not reveal significantly more areas of abnormal DTI signal in the complicated vs. uncomplicated groups, although both MTBI groups had a greater number of areas with increased radial diffusivity compared with the trauma controls. This study illustrates that macrostructural neuroimaging changes following MTBI are associated with measurable changes in DTI signal. Of note, however, the division of MTBI into complicated and uncomplicated subtypes did not predict worse clinical outcome at 6-8 weeks post injury.

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