Chronic Fatigue Syndrome and Cardiovascular Disease: JACC State-of-the-Art Review.
Natelson, Benjamin H, Brunjes, Danielle L, Mancini, Donna · Journal of the American College of Cardiology · 2021 · DOI
Quick Summary
This review examines how ME/CFS affects the heart and blood vessels. Researchers found that people with ME/CFS often have hearts that pump less blood than healthy people, and their blood pressure drops at night. Many also experience rapid heartbeat when standing up. These heart changes may be connected to why people feel worse after physical or mental activity (postexertional malaise).
Why It Matters
This review from a major cardiology journal legitimizes cardiovascular dysfunction as a core feature of ME/CFS rather than a secondary or psychological consequence, potentially improving clinical recognition and diagnosis. For patients, this provides evidence that their symptoms have measurable biological underpinnings. Understanding the cardiac and autonomic basis of PEM may guide development of targeted interventions.
Observed Findings
Reduced stroke volume and cardiac output in ME/CFS patients compared to healthy controls
Inverse relationship between cardiac output and severity of postexertional malaise
MRI-documented reductions in ventricular stroke volume, end-systolic volume, end-diastolic volume, and end-diastolic wall mass
Reduced nocturnal blood pressure on 24-hour ambulatory monitoring
Frequent autonomic dysfunction including orthostatic tachycardia and/or hypocapnia
Inferred Conclusions
Cardiovascular dysfunction is a consistent and measurable feature of ME/CFS despite the condition being historically labeled medically unexplained
Cardiac output abnormalities appear mechanistically linked to postexertional malaise severity
Double consecutive cardiopulmonary stress tests can provide objective metabolic evidence of PEM
Autonomic nervous system dysfunction contributes to orthostatic intolerance in ME/CFS patients
Remaining Questions
Are cardiovascular changes primary pathophysiological drivers of ME/CFS or secondary manifestations of an underlying systemic process?
What This Study Does Not Prove
This review does not establish whether cardiovascular changes are a primary driver of ME/CFS or a consequence of the disease process. It also does not prove that cardiac dysfunction causes all symptoms—correlation between reduced cardiac output and PEM severity does not establish causation. As a review article, it synthesizes existing literature rather than presenting new experimental evidence.
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.