Is chronic fatigue syndrome synonymous with effort syndrome?
Rosen, S D, King, J C, Wilkinson, J B et al. · Journal of the Royal Society of Medicine · 1990 · DOI
Quick Summary
This 1990 study examined whether chronic fatigue syndrome (CFS) might actually be caused by a breathing pattern problem called chronic hyperventilation. The researchers found that 93 out of 100 patients diagnosed with CFS showed signs of this breathing issue instead. They suggest doctors should check patients for hyperventilation problems before diagnosing them with ME or CFS.
Why It Matters
This study raises important questions about diagnostic accuracy in ME/CFS by proposing that some patients labeled with CFS may actually have a treatable breathing disorder. If valid, this could redirect some patients to more effective, conventional treatments. However, its conclusions have been substantially challenged by subsequent ME/CFS research and are not widely accepted in current clinical practice.
Observed Findings
93 out of 100 patients with CFS/ME/PVS diagnoses showed clinical features characteristic of chronic habitual hyperventilation
Respiratory psychophysiological studies were consistent with hyperventilation in the majority of the sample
The time course of illness in these patients matched the pattern expected from chronic hyperventilation
Conventional rehabilitation approaches are available for hyperventilation syndrome
Inferred Conclusions
The authors conclude that CFS/ME/PVS labels should not be applied until chronic habitual hyperventilation has been definitively excluded
They suggest hyperventilation syndrome is underrecognized as a cause of effort intolerance and fatigue
They propose that many patients currently diagnosed with CFS may have a more straightforward, treatable breathing disorder
Remaining Questions
How well do respiratory psychophysiological testing methods identify hyperventilation compared to other objective biomarkers?
What proportion of patients with confirmed ME/CFS have concurrent hyperventilation versus primary ME/CFS pathology?
Do patients with ME/CFS who have hyperventilation respond better to hyperventilation-specific treatment, and if so, to what extent?
What This Study Does Not Prove
This study does not prove that CFS and ME are synonymous with hyperventilation syndrome, nor that hyperventilation is the primary cause of most ME/CFS cases. The study's cross-sectional design cannot establish causation. Furthermore, subsequent research and clinical experience have not supported the authors' conclusion that hyperventilation accounts for the majority of ME/CFS presentations, and many ME/CFS patients do not have respiratory abnormalities.
Tags
Symptom:Fatigue
Method Flag:PEM Not DefinedWeak Case DefinitionNo ControlsExploratory Only