Li, Xia, Julin, Per, Li, Tie-Qiang · Tomography (Ann Arbor, Mich.) · 2021 · DOI
Researchers used a specialized brain imaging technique to measure blood flow in the brains of ME/CFS patients and compared it to healthy people. They found that patients with ME/CFS have reduced blood flow in several areas of the limbic system—the part of the brain that helps control emotions, automatic body functions, and memory. The amount of reduced blood flow was also linked to how severe patients' symptoms were.
This study provides objective neuroimaging evidence that ME/CFS involves measurable changes in brain blood flow, supporting the biological basis of the disease and helping explain cognitive and autonomic symptoms. Identifying specific brain regions affected by hypoperfusion may guide future diagnostic biomarkers and targeted therapeutic interventions.
This study cannot establish whether reduced blood flow causes ME/CFS symptoms or results from the disease process—correlation does not equal causation. The cross-sectional design means we cannot determine whether blood flow abnormalities precede symptom onset or how they change over time. The findings also cannot be generalized beyond the specific patient population studied without replication.
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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