Brooks, J C, Roberts, N, Whitehouse, G et al. · The British journal of radiology · 2000 · DOI
This study used brain imaging to examine a part of the brain called the hippocampus in people with ME/CFS and healthy controls. While the size of the hippocampus was normal in ME/CFS patients, a specific chemical marker called N-acetylaspartate was significantly lower in the right side of the hippocampus compared to healthy people. This suggests there may be subtle differences in how brain cells are functioning in ME/CFS, even when the brain structure looks normal.
This is one of the earlier neuroimaging studies suggesting that ME/CFS may involve biochemical brain changes not visible on standard structural imaging. The finding of altered NAA—a marker of neuronal integrity—supports the hypothesis that ME/CFS has an organic neurobiological basis, which is important for legitimizing the condition and directing future research toward understanding brain metabolism in the disease.
This study does not prove that reduced hippocampal NAA causes ME/CFS symptoms, nor does it establish whether this difference is a cause, consequence, or marker of the disease. The small sample size and lack of correlation with specific symptoms mean these findings cannot be generalized to all ME/CFS patients or used for clinical diagnosis. Cross-sectional design prevents any conclusions about whether NAA levels change over time.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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