E2 ModerateModerate confidencePEM unclearCross-SectionalPeer-reviewedMachine draft
Increased ventricular lactate in chronic fatigue syndrome measured by 1H MRS imaging at 3.0 T. II: comparison with major depressive disorder.
Murrough, James W, Mao, Xiangling, Collins, Katherine A et al. · NMR in biomedicine · 2010 · DOI
Quick Summary
This study used a special type of brain imaging called MRI to measure a substance called lactate in the fluid around the brain of people with ME/CFS. The researchers found that people with ME/CFS had significantly higher lactate levels compared to healthy people and people with depression. Interestingly, people with depression had normal lactate levels, suggesting this finding may be specific to ME/CFS and not just a symptom of mental illness.
Why It Matters
This study provides objective neurobiological evidence that ME/CFS involves measurable brain metabolite abnormalities distinct from major depression, helping to establish ME/CFS as a biological illness rather than purely psychiatric. The correlation between lactate and mental fatigue severity suggests a potential biomarker that could eventually aid in diagnosis and monitoring of disease severity.
Observed Findings
- Ventricular CSF lactate was significantly elevated in CFS compared to healthy volunteers, replicating previous findings from a prior cohort.
- Ventricular lactate levels in MDD did not differ significantly from either CFS or healthy control groups.
- A significant correlation existed between ventricular CSF lactate and mental fatigue severity that was specific to the CFS group.
- No significant differences in GABA or glutamate+glutamine (Glx) levels were detected between CFS, MDD, and healthy control groups.
Inferred Conclusions
- Elevated ventricular CSF lactate may be a biomarker relatively specific to ME/CFS and not simply a feature of psychiatric illness overlap.
- The correlation between lactate and mental fatigue suggests lactate may be a relevant neurometabolic measure in CFS pathophysiology.
- Altered amino acid neurotransmitters (GABA and glutamate) do not appear to be primary neurometabolic abnormalities distinguishing CFS from MDD or health.
Remaining Questions
- What causes the elevated lactate in ME/CFS, and does it reflect impaired cerebral metabolism or mitochondrial dysfunction?
- Does lactate elevation correlate with other ME/CFS symptoms beyond mental fatigue, such as post-exertional malaise or physical fatigue?
What This Study Does Not Prove
This study does not prove that elevated lactate causes ME/CFS symptoms or that it is the primary mechanism of the disease. The cross-sectional design cannot establish causality, only association. Small sample sizes (17 CFS subjects) limit generalizability, and the findings require replication in larger, well-characterized cohorts before clinical application.
Tags
Symptom:Cognitive DysfunctionPainFatigue
Biomarker:MetabolomicsNeuroimaging
Method Flag:Small SampleExploratory Only
Metadata
- DOI
- 10.1002/nbm.1512
- PMID
- 20661876
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026
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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