E3 PreliminaryPreliminaryPEM unclearReview-NarrativePeer-reviewedMachine draft
Sex differences in vascular endothelial function related to acute and long COVID-19.
Kitselman A, Kayla, Bédard-Matteau, Jérôme, Rousseau, Simon et al. · Vascular pharmacology · 2024 · DOI
Quick Summary
This review examines how COVID-19 and long COVID affect blood vessel health differently in men and women. The authors look at how the virus can damage the inner lining of blood vessels, trigger immune problems, and potentially lead to ME/CFS symptoms. They explore whether biological sex differences explain why some people recover while others develop long-term symptoms like fatigue.
Why It Matters
Understanding sex differences in how COVID-19 damages blood vessels and triggers ME/CFS is critical for developing sex-informed treatment approaches and identifying why some patients develop chronic symptoms. This review consolidates evidence linking vascular dysfunction to ME/CFS symptoms, potentially opening new therapeutic targets for long COVID patients.
Observed Findings
- Sex differences exist in acute COVID-19 infection rates and severity, with differential outcomes between males and females
- Long COVID and ME/CFS symptoms occur at different rates between sexes following SARS-CoV-2 infection
- Endotheliitis and endothelial dysfunction have been identified as features of acute COVID-19 pathology
- Sex differences in immune response to viral infections have been documented in other post-viral conditions
- Vascular endothelial dysfunction may be mechanistically linked to ME/CFS symptom development
Inferred Conclusions
- Sex hormones and immune system differences likely contribute to differential susceptibility and severity of long COVID and ME/CFS between males and females
- Endothelial dysfunction represents a potential biological pathway connecting acute COVID-19 to chronic ME/CFS symptom development
- Sex-specific mechanisms of immune dysregulation following SARS-CoV-2 infection warrant further investigation as explanations for sex-differentiated long COVID outcomes
Remaining Questions
- What specific molecular and hormonal mechanisms explain sex differences in endothelial dysfunction during and after COVID-19?
- How does endothelial dysfunction directly contribute to ME/CFS-specific symptoms like post-exertional malaise and cognitive dysfunction?
What This Study Does Not Prove
As a narrative review rather than a primary research study, this article does not present original experimental data and cannot prove causation between endothelial dysfunction and ME/CFS. It does not establish definitive sex-based mechanisms but rather synthesizes existing evidence, which may have gaps or inconsistencies. Individual studies cited may show correlation rather than direct causal relationships.
Tags
Symptom:Fatigue
Phenotype:Infection-TriggeredLong COVID Overlap
Method Flag:Exploratory OnlySex-Stratified
Metadata
- DOI
- 10.1016/j.vph.2023.107250
- PMID
- 38043758
- Review status
- Machine draft
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- Last updated
- 10 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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