Periventricular White Matter Alterations From Explosive Blast in a Large Animal Model: Mild Traumatic Brain Injury or...

Area of Science:

• Neuropathology
• Neuroscience
• Traumatic Brain Injury

Background:

• Mild traumatic brain injury (mTBI) from explosive blasts is poorly understood in humans due to low fatality rates.
• Large animal models are needed to accurately study blast-induced brain injuries.

Purpose of the Study:

• To investigate the neuropathology of blast exposure on a constrained head in a large animal model.
• To determine the effects of single versus multiple blast exposures on axonal injury.

Main Methods:

• Yucatan minipigs were exposed to 1, 2, or 3 controlled explosive blasts with restrained heads.
• Axonal injury was assessed using β-amyloid precursor protein immunohistochemistry 3 weeks to 8 months post-exposure.

Main Results:

• Blast exposure caused axonal injury confined to the periventricular white matter, detectable as early as 3-5 weeks post-blast.
• Injury persisted up to 8 months post-blast.
• Multiple blast exposures resulted in more severe axonal injury compared to single exposures.

Conclusions:

• Blast exposure can induce neuropathology similar to mTBI or subconcussive injuries in humans.
• Periventricular white matter injury may have long-term neuropsychiatric consequences.
• This animal model effectively replicates blast-induced brain injury patterns.