Fischler, B, D'Haenen, H, Cluydts, R et al. · Neuropsychobiology · 1996 · DOI
This study used a brain imaging technique called SPECT scans to compare blood flow in the brains of people with ME/CFS, people with depression, and healthy volunteers. Researchers found that in ME/CFS patients, blood flow in the front part of the brain was connected to cognitive problems and physical activity limitations. Unlike depression, ME/CFS did not show overall reduced blood flow in the brain, but did show a specific pattern of asymmetry (one side different from the other) in the side-back regions.
This research provides objective neuroimaging evidence that ME/CFS involves measurable differences in brain blood flow patterns, potentially explaining the cognitive and physical limitations patients experience. The distinct pattern from depression supports the biological distinctness of ME/CFS, which has important implications for diagnosis and treatment approaches.
This study demonstrates correlation between frontal blood flow and symptoms, but does not prove that abnormal blood flow causes cognitive impairment or physical limitations—the relationship could be bidirectional or driven by a third factor. The small sample size and exploratory design mean findings require confirmation in larger, prospective studies before drawing firm clinical conclusions. SPECT imaging patterns alone cannot be used as a diagnostic test for ME/CFS.
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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