E2 ModerateModerate confidencePEM ?Cross-SectionalPeer-reviewedMachine draft
The maintained attention assessment in patients affected by Myalgic encephalomyelitis/chronic fatigue syndrome: a reliable biomarker?
Murga, Iñigo, Aranburu, Larraitz, Gargiulo, Pascual A et al. · Journal of translational medicine · 2021 · DOI
Quick Summary
This study looked at attention problems in ME/CFS patients by giving them a simple attention test (the Toulouse-Piéron test) and comparing their results to healthy people. Most ME/CFS patients had normal overall thinking skills, but 70% showed very low attention scores and complained of mental fatigue. Women with ME/CFS reported feeling more effort during the test than men did, even though their attention scores were similar.
Why It Matters
Cognitive dysfunction is a hallmark symptom of ME/CFS yet lacks objective biomarkers for clinical diagnosis. This study provides evidence that a relatively simple, standardized attention test combined with fatigue perception measures may help clinicians identify or support ME/CFS diagnosis, potentially reducing diagnostic delay and validating patient-reported cognitive symptoms.
Observed Findings
- Seventy percent of ME/CFS patients showed low or very low sustained attention scores (GIAP) compared to healthy controls (p < 0.05), despite normal overall cognitive function on Montreal Cognitive Assessment.
- ME/CFS patients reported marked cognitive fatigue after the attention test compared to controls.
- Women with ME/CFS perceived significantly higher cognitive effort during testing than affected men, though attention scores and fatigue levels did not differ by gender.
- No significant gender differences in attention or fatigue severity were detected in the patient group.
- Deficits in sustained attention and elevated perceived effort after cognitive testing distinguished patients from healthy controls.
Inferred Conclusions
- Sustained attention impairment is a sensitive and reliable marker of ME/CFS that occurs independently of overall cognitive preservation.
- Cognitive fatigue and effort perception, measured after standardized attention testing, may serve as complementary biomarkers to support clinical diagnosis.
- Women with ME/CFS may experience higher subjective cognitive load despite objective performance similarities with affected men, suggesting gender-dependent symptom perception.
- The combination of attention testing and effort/fatigue perception assessment warrants further validation as a clinical screening tool.
What This Study Does Not Prove
This study does not prove that the Toulouse-Piéron test is a definitive diagnostic tool for ME/CFS, as it is a single cross-sectional study without longitudinal validation or comparison to other conditions causing cognitive impairment. It cannot establish causation (whether attention deficits cause fatigue or fatigue impairs attention), only association. The small sample size and lack of clinical-outcome follow-up limit generalizability.
Tags
Symptom:Cognitive DysfunctionFatigue
Method Flag:Small SampleStrong PhenotypingSex-Stratified