E3 PreliminaryPreliminaryPEM unclearEditorialPeer-reviewedReviewed
Microvascular Capillary and Precapillary Cardiovascular Disturbances Strongly Interact to Severely Affect Tissue Perfusion and Mitochondrial Function in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Evolving from the Post COVID-19 Syndrome.
Wirth, Klaus Josef, Löhn, Matthias · Medicina (Kaunas, Lithuania) · 2024 · DOI
Quick Summary
This study proposes that ME/CFS may develop from COVID-19 in some people due to problems with how blood flows through tiny vessels in the body. The researchers suggest that abnormal blood cells and clots, combined with weak heart function and overly constricted blood vessels, create a double problem that starves muscles of oxygen and damages the energy-producing structures (mitochondria) inside cells. This combination may trigger a harmful cycle that keeps the problem going.
Why It Matters
This study provides a testable mechanistic framework linking cardiovascular dysfunction, microvascular pathology, and mitochondrial dysfunction—three key findings in ME/CFS research. If accurate, it could guide development of targeted treatments addressing blood flow, clotting, and vascular tone rather than only symptom management. It also helps explain why some COVID-19 patients transition to severe, persistent ME/CFS while others recover.
Observed Findings
- Microclots and malformed blood cells detected in PCS patients' blood and microvessels
- Impaired capillary blood flow due to pathological blood components and endothelial dysfunction
- Reduced cardiac stroke volume and poor vasoconstriction capacity in some patients
- Excess vasoconstrictor activity relative to vasodilator activity in resistance vessels
- Proposed ischemia-reperfusion injury pattern causing mitochondrial calcium and sodium overload
Inferred Conclusions
- The interaction of capillary stasis (from blood pathology) and low precapillary perfusion pressure (from cardiovascular dysfunction) creates a unique perfusion disturbance causing capillary ischemia-reperfusion injury
- Mitochondrial dysfunction in skeletal muscle results from sodium and calcium overload via this perfusion mechanism
- This vicious cycle, once initiated, becomes self-perpetuating through reactive oxygen species generation
- Predisposed individuals with this combination may develop full ME/CFS syndrome following PCS
Remaining Questions
- Do all ME/CFS patients exhibit this microvascular-precapillary interaction, or only a subset? Which interventions—anticoagulants, vasodilators, cardiac support, or mitochondrial therapies—would most effectively interrupt this proposed cycle?
What This Study Does Not Prove
This is a theoretical mechanistic proposal, not original experimental research, so it does not prove causation or validate these mechanisms in patient populations. The study does not establish whether microvascular disturbances are primary drivers of ME/CFS or secondary consequences of other pathology. It cannot determine treatment efficacy or which interventions would be most effective.
Tags
Symptom:Post-Exertional MalaiseFatigue
Biomarker:Blood Biomarker
Phenotype:Infection-TriggeredLong COVID Overlap
Method Flag:Weak Case DefinitionExploratory OnlyPEM Not Defined
Metadata
- DOI
- 10.3390/medicina60020194
- PMID
- 38399482
- Review status
- Editor reviewed
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- Last updated
- 12 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 →
Contribute
Private, reviewed by a human. Not a public comment thread.