Evaluation of neurologic function in Gulf War veterans. A blinded case-control study

Area of Science:

• Neurology
• Military Medicine
• Neuroscience

Background:

• Gulf War veterans have reported a range of unexplained chronic illnesses.
• The underlying cause of these Gulf War-related illnesses remains a significant public health concern.

Purpose of the Study:

• To investigate potential central and peripheral nervous system dysfunction in veterans experiencing Gulf War-related illnesses.
• To determine if specific syndromes identified in these veterans are linked to neurological abnormalities.

Main Methods:

• A nested case-control study was conducted involving 23 veterans with Gulf War-related syndromes and 20 healthy controls (deployed and non-deployed).
• Participants underwent a comprehensive battery of objective tests, including neurophysiological, audiovestibular, neuroradiological, and neuropsychological assessments, while blinded to group allocation.

Main Results:

• Veterans with Gulf War-related illnesses exhibited significant neuropsychological deficits, including impaired brain function indicated by the Halstead Impairment Index.
• Abnormalities were observed in brain stem auditory evoked potentials, rotational testing, saccadic velocity, and somatosensory evoked potentials, suggesting widespread nervous system involvement.
• Specific syndromes were associated with distinct patterns of neurological impairment, with "confusion-ataxia" showing the most significant deficits across multiple tests.

Conclusions:

• The identified syndromes in Gulf War veterans are likely manifestations of a generalized nervous system injury.
• These findings support the hypothesis that neurological dysfunction is a key component of Gulf War-related illnesses.