Progressive brain changes in patients with chronic fatigue syndrome: A longitudinal MRI study

Area of Science:

• Neuroimaging
• Neurology
• Medical Science

Background:

• Chronic Fatigue Syndrome (CFS) is a complex, debilitating disorder with unknown pathophysiology.
• Progressive brain changes in CFS have been difficult to ascertain due to limited longitudinal studies.
• Understanding the neurobiological underpinnings of CFS is crucial for developing effective treatments.

Purpose of the Study:

• To investigate progressive brain changes in individuals with Chronic Fatigue Syndrome (CFS) using longitudinal Magnetic Resonance Imaging (MRI).
• To identify specific brain regions and tissue types affected by progressive changes in CFS.
• To correlate observed brain changes with clinical symptom severity in CFS patients.

Main Methods:

• Longitudinal MRI scans (1.5 Tesla) were acquired from 15 CFS patients and 10 normal controls (NCs) 6 years apart.
• Analysis included gray matter (GM) and white matter (WM) volumes, and T1/T2-weighted signal intensities.
• Voxel-based morphometry was employed to compare longitudinal changes between groups and correlate MRI findings with symptom scores.

Main Results:

• A significant decrease in WM volume was observed in the left inferior fronto-occipital fasciculus (IFOF) of CFS patients, while NCs showed no change.
• Group comparisons revealed decreased regional WM volumes in adjacent areas and decreased GM and blood volumes in contralateral regions in CFS patients.
• Regional GM and WM volumes, along with T2-weighted signal intensities in affected areas, correlated significantly with CFS symptom severity.

Conclusions:

• CFS is associated with progressive WM deficits in the IFOF, indicating ongoing neurodegenerative processes.
• These IFOF WM deficits deteriorate at an abnormal rate in CFS patients.
• The findings highlight the structural brain changes underlying CFS and their relationship to clinical presentation.