Routine and quantitative EEG in mild traumatic brain injury

Area of Science:

• Neuroscience
• Neurology
• Medical Diagnostics

Background:

• Mild traumatic brain injury (mTBI) involves complex pathophysiology, including axonal injury and cytotoxicity.
• Clinical presentation and symptoms of mTBI, such as loss of consciousness and postictal-like symptoms, can mimic other neurological events.
• Electrophysiological changes observed in EEG and QEEG tests following mTBI often resolve over time.

Purpose of the Study:

• To review the pathophysiology of mTBI and its correlation with EEG and quantitative EEG (QEEG) findings.
• To evaluate the diagnostic utility and limitations of EEG and QEEG in the context of mTBI.
• To assess the clinical usefulness of QEEG for diagnosing brain injury after concussion or mTBI.

Main Methods:

• Systematic review of research on mTBI pathophysiology, clinical presentation, and EEG/QEEG findings.
• Analysis of studies examining electrophysiological changes after mild head injury.
• Evaluation of QEEG's strengths and weaknesses as a diagnostic tool for mTBI.

Main Results:

• EEG commonly shows posterior dominant rhythm slowing and diffuse theta slowing post-mTBI, which may normalize rapidly or over weeks.
• No unique EEG or QEEG features definitively identify mTBI.
• The correlation between electrophysiological findings and clinical symptoms diminishes significantly late after injury.

Conclusions:

• EEG and QEEG findings in mTBI are generally non-specific and transient.
• There are no pathognomonic electrophysiological signatures for mTBI, limiting their use as standalone diagnostic tests, particularly for late-stage assessment.
• Commercial applications of QEEG for mTBI diagnosis face challenges due to the transient and non-specific nature of findings.