Baseline EEG abnormalities in mild traumatic brain injury from the BIMA study

Area of Science:

• Neuroscience
• Neurology
• Traumatic Brain Injury Research

Background:

• Persistent post-concussive symptoms (PPCS) following mild traumatic brain injury (mTBI) affect service members.
• Electroencephalogram (EEG) findings in this population are not well-documented.
• Hyperbaric oxygen therapy (HBO₂) is being investigated for PPCS.

Purpose of the Study:

• To report baseline clinical EEG findings in service members with PPCS after mTBI.
• To explore associations between EEG results and demographics, medications, neurological assessments, and MRI outcomes.
• To contribute to understanding EEG in the context of mTBI and PPCS.

Main Methods:

• A randomized, double-blind, sham-controlled trial (BIMA study) involving service members with PPCS after mTBI.
• Clinical EEG assessments by neurologists for slow wave activity and other abnormalities.
• Exploration of associations with demographic data, medication use, neurological exams, and MRI findings.

Main Results:

• EEG slowing was present in 39% of participants (generalized 37%, localized 8%, both 6%).
• No significant associations were found between EEG slowing and demographics, medication, or neurological evaluation.
• Participants without EEG slowing paradoxically showed significantly more white matter hyperintensities on MRI (p = 0.003).

Conclusions:

• EEG slowing is a frequent finding in service members with PPCS after mTBI.
• Baseline EEG slowing does not appear to correlate with demographic factors, medication, or neurological status.
• An inverse relationship between EEG slowing and white matter hyperintensities warrants further investigation.