What lies beneath: White matter microstructure in pediatric myalgic encephalomyelitis/chronic fatigue syndrome using diffusion MRI.
Josev, Elisha K, Chen, Jian, Seal, Marc et al. · Journal of neuroscience research · 2023 · DOI
Quick Summary
Researchers used advanced brain imaging to look for structural changes in the brains of teenagers recently diagnosed with ME/CFS compared to healthy peers. While teens with ME/CFS showed worse fatigue, pain, sleep quality, and cognitive problems like slower thinking speed, the brain scans did not reveal significant differences in white matter (the brain tissue that carries signals between brain regions). This suggests that early-stage ME/CFS in teenagers may not involve obvious structural brain changes, unlike what has been found in adult ME/CFS patients.
Why It Matters
Understanding whether ME/CFS causes detectable brain changes is crucial for establishing objective biomarkers and validating the biological basis of the disease. This study provides important evidence that early-stage pediatric ME/CFS may have a different neurobiological signature than adult ME/CFS, which could influence how we approach diagnosis, prognosis, and treatment strategies in young patients.
Observed Findings
Adolescents with ME/CFS showed significantly greater fatigue and pain compared to healthy controls.
Adolescents with ME/CFS demonstrated poorer sleep quality than controls.
Adolescents with ME/CFS had poorer cognitive performance on measures of processing speed and sustained attention.
No significant group differences in white matter microstructural properties were identified after appropriate statistical correction.
One finding of greater white matter fiber cross section in the left inferior longitudinal fasciculus in the ME/CFS group did not survive correction for intracranial volume.
Inferred Conclusions
White matter microstructural abnormalities may not be a prominent feature of pediatric ME/CFS in the early post-diagnosis period.
The differences between this study's null findings and documented white matter changes in adult ME/CFS suggest that age and/or illness duration may influence the development of structural brain changes.
Clinical symptoms in early-stage pediatric ME/CFS may arise from functional rather than structural brain alterations.
Remaining Questions
Do white matter changes emerge in pediatric ME/CFS patients as disease duration increases or after longer follow-up periods?
What This Study Does Not Prove
This study does not prove that white matter changes never occur in pediatric ME/CFS—only that they may not be present in the early stages following diagnosis. The small sample size and cross-sectional design prevent conclusions about causation or whether brain changes develop over time. The findings also do not explain the mechanisms behind the cognitive and symptom-related impairments observed in these adolescents.
Are the cognitive and symptom-related impairments in early-stage pediatric ME/CFS attributable to functional alterations in brain connectivity or neurochemistry rather than structural changes?
What neurobiological mechanisms underlie the cognitive deficits (processing speed, sustained attention) observed in adolescents with recently diagnosed ME/CFS if white matter structure is largely intact?
How do the findings in this recently diagnosed pediatric cohort compare longitudinally to the same individuals assessed years later in adulthood?