E2 ModerateModerate confidencePEM unclearCase-ControlPeer-reviewedMachine draft
Low-grade inflammation and arterial wave reflection in patients with chronic fatigue syndrome.
Spence, Vance A, Kennedy, Gwen, Belch, Jill J F et al. · Clinical science (London, England : 1979) · 2008 · DOI
Quick Summary
This study found that people with ME/CFS have stiffer arteries and higher levels of inflammation and oxidative stress (cellular damage) compared to healthy people. These cardiovascular changes are associated with each other and may increase the risk of future heart problems in people with ME/CFS.
Why It Matters
This study provides objective evidence that ME/CFS patients may have increased cardiovascular risk, a concern many patients report. The findings suggest that arterial stiffness assessment could become a useful clinical tool for identifying which ME/CFS patients are at higher cardiovascular risk and may need preventive interventions.
Observed Findings
- CFS patients had significantly higher arterial wave reflection (AIx@75: 22.5% vs 13.3% in controls; P=0.002)
- CFS patients had elevated C-reactive protein (CRP) levels (2.58 vs 1.07 μg/ml; P<0.01)
- CFS patients had elevated isoprostane levels (470.7 vs 331.1 pg/ml; P<0.005), indicating oxidative stress
- Arterial stiffness correlated with CRP (r=0.507), isoprostanes (r=0.366), oxidized LDL (r=0.333), and systolic blood pressure (r=0.371) in CFS patients
- In multivariate analysis, CRP, age, and female gender independently predicted arterial stiffness in CFS patients
Inferred Conclusions
- ME/CFS patients exhibit a combination of increased arterial stiffness, systemic inflammation, and oxidative stress not seen in healthy controls
- This constellation of cardiovascular abnormalities may confer increased risk of future cardiovascular events in CFS patients
- Arterial wave reflection assessment could be a useful clinical tool for identifying and monitoring cardiovascular risk in ME/CFS populations
Remaining Questions
- Do these cardiovascular abnormalities develop early in ME/CFS or progress over time, and do they correlate with disease severity or symptom burden?
- What mechanisms link ME/CFS pathophysiology to arterial stiffness and inflammation—is this driven by immune activation, endothelial dysfunction, or other factors?
What This Study Does Not Prove
This study does not prove that inflammation and oxidative stress cause arterial stiffness in ME/CFS—only that they are correlated. It also does not establish whether these cardiovascular changes will actually lead to future heart disease, nor does it clarify whether the cardiovascular dysfunction is a primary feature of ME/CFS or secondary to inactivity or other factors.
Tags
Symptom:Fatigue
Biomarker:CytokinesBlood Biomarker
Method Flag:PEM Not DefinedSmall Sample
Metadata
- DOI
- 10.1042/CS20070274
- PMID
- 18031285
- 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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