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Journal of Neurotrauma
Longitudinal Changes in Global Brain Volume between 79 and 409 Days after Traumatic Brain Injury: Relationship with Duration of Coma

To cite this article:
Mehul A. Trivedi, Michael A. Ward, Timothy M. Hess, Shawn D. Gale, Robert J. Dempsey, Howard A. Rowley, Sterling C. Johnson. Journal of Neurotrauma. May 2007, 24(5): 766-771. doi:10.1089/neu.2006.0205.

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Mehul A. Trivedi
William S. Middleton Memorial VA Hospital, Geriatric Research Education and Clinical Center (GRECC), Madison, Wisconsin.
Departments of Medicine,University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
Michael A. Ward
William S. Middleton Memorial VA Hospital, Geriatric Research Education and Clinical Center (GRECC), Madison, Wisconsin.
Departments of Medicine,University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
Timothy M. Hess
Departments of Biostatistics and Medical Informatics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
Shawn D. Gale
Barrow Neurological Institute, Department of Clinical Neuropsychology, Phoenix, Arizona.
Robert J. Dempsey
Department of Neurosurgery and University of Wisconsin School of Medicine and Public Health, Medison, Wisconsin.
Howard A. Rowley
Department of Radiology,University of Wisconsin School of Medicine and Public Health, Medison, Wisconsin.
Sterling C. Johnson
William S. Middleton Memorial VA Hospital, Geriatric Research Education and Clinical Center (GRECC), Madison, Wisconsin.
Departments of Medicine,University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.

Neuropathological and experimental animal studies indicate that traumatic brain injury (TBI) results in long-term, neurodegenerative changes. Structural image evaluation using normalization of atrophy (SIENA) offers an automated analysis of the subtle changes in percent brain volume change (%BVC) associated with TBI. In the present study, SIENA was used to evaluate %BVC in individuals who had sustained a mild to severe TBI. We obtained three-dimensional (3D) T1-weighted anatomical magnetic resonance imaging (MRI) scans approximately 79 days and again 409 days post-injury. TBI patients (n = 37) displayed significantly greater decline in %BVC (−1.43%) relative to a normal comparison group (+0.1%, n = 30). Greater %BVC was associated with longer duration of post-injury coma. These results confirm previous findings from cross-sectional studies and argue that the brain undergoes continued structural change for several months post-injury.

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