E3 PreliminaryPreliminaryPEM not requiredReview-NarrativePeer-reviewedReviewed
Post-Acute COVID-19 Syndrome and the cardiovascular system: What is known?
Dixit, Neal M, Churchill, Austin, Nsair, Ali et al. · American heart journal plus : cardiology research and practice · 2021 · DOI
Quick Summary
Some people who have had COVID-19 develop long-lasting symptoms weeks or months later, including chest pain and heart palpitations (feeling your heart racing). This review examines what we know about how COVID-19 affects the heart during this long-COVID period. While the virus itself rarely causes direct heart damage, it can trigger several heart-related conditions that may explain why patients experience these symptoms.
Why It Matters
This work is relevant to ME/CFS because many long-COVID patients report orthostatic symptoms and cardiac manifestations similar to those seen in ME/CFS, and understanding post-viral cardiovascular dysfunction may illuminate shared pathophysiological mechanisms. A clearer framework for evaluating and managing cardiac symptoms in post-viral syndromes could improve clinical care and reduce diagnostic delays for patients with persistent unexplained symptoms.
Observed Findings
- Cardiovascular symptoms such as chest pain and palpitations are common in PACS but lack clearly defined underlying mechanisms in many cases.
- Autopsy studies demonstrate that SARS-CoV-2 rarely causes direct myocardial injury despite cardiovascular symptom prevalence.
- Postural Orthostatic Tachycardia Syndrome, myocarditis, and pericarditis have been identified in PACS patients.
- Biomarker evidence of myocardial injury in acutely hospitalized COVID-19 patients may indicate stress-induced unmasking of pre-existing coronary artery disease rather than primary viral injury.
Inferred Conclusions
- The cardiovascular manifestations of PACS arise from multiple distinct mechanisms rather than a single pathophysiological pathway.
- Clinical evaluation and management frameworks are needed to systematically assess cardiac symptoms and identify patients requiring medical optimization.
- Understanding stress-induced physiological decompensation may be as important as identifying direct viral injury in PACS-related cardiac dysfunction.
Remaining Questions
- What is the true prevalence of each cardiovascular syndrome (myocarditis, pericarditis, POTS, etc.) in the broader PACS population?
- What are the long-term cardiovascular outcomes in PACS patients, and do they require extended cardiac monitoring or intervention?
What This Study Does Not Prove
This review does not establish causation between SARS-CoV-2 and specific cardiovascular syndromes, nor does it quantify prevalence of individual cardiac conditions in PACS. The review does not prove that mechanisms underlying cardiovascular symptoms in long-COVID are identical to ME/CFS, nor does it provide evidence-based diagnostic criteria or treatment protocols validated in randomized controlled trials.
Tags
Symptom:Orthostatic IntolerancePainFatigue
Biomarker:Blood Biomarker
Phenotype:Infection-TriggeredLong COVID Overlap
Method Flag:PEM Not DefinedWeak Case DefinitionExploratory Only
Metadata
- DOI
- 10.1016/j.ahjo.2021.100025
- PMID
- 34192289
- 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 →
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