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Kamnaksh A, Budde MD, Kovesdi E, Long JB, Frank JA, Agoston DV. Diffusion tensor imaging reveals acute subcortical changes after mild blast-induced traumatic brain injury. Sci Rep 2014; 4:4809. [PMID: 24786839 PMCID: PMC4019232 DOI: 10.1038/srep04809] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 03/27/2014] [Indexed: 12/17/2022] Open
Abstract
Mild blast-induced traumatic brain injury (mbTBI) poses special diagnostic challenges due
to its overlapping symptomatology with other neuropsychiatric conditions and the lack of
objective outcome measures. Diffusion tensor imaging (DTI) can potentially provide
clinically relevant information toward a differential diagnosis. In this study, we aimed to
determine if single and repeated (5 total; administered on consecutive days) mild blast
overpressure exposure results in detectable structural changes in the brain, especially in
the hippocampus. Fixed rat brains were analyzed by ex vivo DTI at 2 h and 42 days after
blast (or sham) exposure(s). An anatomy-based region of interest analysis revealed
significant interactions in axial and radial diffusivity in a number of subcortical
structures at 2 h only. Differences between single- and multiple-injured rats were largely
in the thalamus but not the hippocampus. Our findings demonstrate the value and the
limitations of DTI in providing a better understanding of mbTBI pathobiology.
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Affiliation(s)
- Alaa Kamnaksh
- 1] Department of Anatomy, Physiology and Genetics, The Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814 [2] Center for Neuroscience and Regenerative Medicine, The Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814
| | - Matthew D Budde
- 1] Radiology and Imaging Sciences, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Room B1N256 MSC 1074, 10 Center Drive, Bethesda, MD 20892 [2]
| | - Erzsebet Kovesdi
- US Department of Veterans Affairs, Veterans Affairs Central Office, 810 Vermont Avenue NW, Washington, DC 20420
| | - Joseph B Long
- Blast-Induced Neurotrauma Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, 503 Robert Grant Avenue, Silver Spring, MD 20910
| | - Joseph A Frank
- Radiology and Imaging Sciences, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Room B1N256 MSC 1074, 10 Center Drive, Bethesda, MD 20892
| | - Denes V Agoston
- Department of Anatomy, Physiology and Genetics, The Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD 20814
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