Maclachlan, Laura, Watson, Stuart, Gallagher, Peter et al. · PloS one · 2017 · DOI
This study looked at whether different diagnostic criteria for ME/CFS are actually identifying the same disease or different versions of it. Researchers tested 49 ME/CFS patients and 10 healthy controls using questionnaires and objective tests of heart function and thinking ability. They found that patients reported more autonomic and cognitive symptoms than controls, but objective heart tests didn't show clear differences—though different patient subgroups did show different levels of impairment on cognitive testing.
ME/CFS research has been hampered by different diagnostic criteria, which may identify different disease subtypes or severity spectrums rather than a single condition. This work suggests that inconsistent diagnostic criteria could explain conflicting research findings and complicate patient management. Understanding whether we are studying the same disease across studies is critical for developing effective treatments and reducing misdiagnosis.
This study does not prove that different criteria diagnose entirely separate diseases—only that they may identify different points on a disease spectrum or phenotypes. The lack of objective autonomic differences between CFS and controls may reflect study design choices (sedentary controls, depression exclusion) rather than true disease absence. Findings cannot establish causation or determine which criteria best identify the 'true' ME/CFS phenotype.
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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