White Matter Hyperintensities and Mild TBI in Post-9/11 Veterans and Service Members

Area of Science:

• Neuroimaging and neuroscience
• Traumatic Brain Injury research
• Military medicine

Background:

• White matter hyperintensities (WMHs) on MRI after traumatic brain injury (TBI) have unclear neurobehavioral significance, particularly in Veterans with mild TBI (mTBI).
• Understanding WMH in mTBI is crucial for Veterans and Service Members.

Purpose of the Study:

• To investigate the relationship between WMH, mTBI history, age, and cognitive performance in a large cohort of Veterans.
• To identify potential clinical correlates of WMH in this population.

Main Methods:

• Neuroimaging and neurobehavioral assessments of 1,011 combat-exposed Veterans (22-69 years).
• Comparison between mTBI (n=813) and no-mTBI (n=198) groups.
• Analysis of WMH presence, cognitive function, and other biomarkers.

Main Results:

• WMH prevalence was similar in mTBI and control groups (39% vs 37%).
• An age-by-diagnosis interaction showed increased WMH in older mTBI Veterans.
• Increased WMH correlated with service-connected disability, IGF-1 levels, and poorer episodic memory and executive functioning-processing speed.

Conclusions:

• Significant clinical relationships exist between head injury history and radiological findings in larger mTBI samples.
• Longitudinal studies with follow-up MRI and neurobehavioral assessments are needed to understand long-term WMH implications post-mTBI.