Khan, Faisel, Spence, Vance, Kennedy, Gwen et al. · Clinical physiology and functional imaging · 2003 · DOI
This study looked at how blood vessels in the skin of ME/CFS patients respond to acetylcholine, a chemical messenger in the body. Researchers found that while the initial response was similar in patients and healthy controls, the blood vessels of ME/CFS patients took much longer to return to normal after the chemical was applied. This suggests that the way nerve signals control blood vessel function may be different in ME/CFS.
Orthostatic intolerance and abnormal blood pressure regulation are major symptoms affecting many ME/CFS patients. This study provides objective evidence of a biological abnormality in how blood vessels respond to nerve signals, potentially explaining these vascular symptoms and pointing toward cholinergic dysfunction as a mechanism worth further investigation.
This study demonstrates an association between prolonged acetylcholine response and ME/CFS but does not prove it causes the illness or explain the underlying cause of the cholinergic abnormality. It measures only peripheral skin microcirculation and cannot directly demonstrate what is happening in the brain or in deeper blood vessels. The findings are correlational and do not establish whether this vascular dysfunction is primary to ME/CFS or secondary to other pathological processes.
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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