Self-Reported Autonomic Dysregulation in Gulf War Illness

Area of Science:

• Neuroscience
• Clinical Medicine
• Public Health

Background:

• Autonomic nervous system (ANS) dysregulation is a common feature of Gulf War illness (GWI).
• Previous research indicated autonomic symptoms predict physical functioning in GWI Veterans.
• This study aimed to replicate and extend these findings in a new sample.

Purpose of the Study:

• To validate the predictive relationship between autonomic symptoms and physical functioning in GWI.
• To identify specific autonomic symptom subscales that are significant predictors of physical functioning.
• To explore the combined predictive power of autonomic symptoms, BMI, and mental health burden on physical functioning.

Main Methods:

• Linear regression models were employed to predict physical functioning using the SF-36.
• Predictors included the Composite Autonomic Symptom Score (COMPASS-31) total score and subscales, BMI, and mental health burden (PTSD/depression).
• Forward stepwise regression was used to identify the most impactful predictors.

Main Results:

• Autonomic symptoms (COMPASS-31), BMI, and mental health burden collectively explained 38.2% of the variance in physical functioning.
• Gastrointestinal and secretomotor subscales of COMPASS-31 emerged as significant predictors, increasing explained variance to 39.3% and 43.4%, respectively.
• Mental health burden was not a significant predictor in this study's models, contrasting with prior research.

Conclusions:

• Autonomic dysregulation, particularly gastrointestinal and secretomotor symptoms, is a strong predictor of physical functioning in GWI.
• Prioritizing treatments targeting autonomic dysfunction is recommended for GWI Veterans.
• Further research and clinical recommendations should focus on managing autonomic symptoms for chronic pain in GWI.