ArticleEClinicalMedicine2024
Cardiac manifestations and outcomes of COVID-19 vaccine-associated myocarditis in the young in the USA: longitudinal results from the Myocarditis After COVID Vaccination (MACiV) multicenter study.
Article in EClinicalMedicine, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 12 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
12 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Cardiopulmonary crosstalk in Long COVID: a systematic review of emerging evidence.BMC cardiovascular disorders · 2025Pooled it
- Safety of COVID-19 mRNA-1273 booster doses in Asian populations: A literature review of post-marketing observational studies.Human vaccines & immunotherapeutics · 2026Review
- Autoimmune Features of Post-COVID-19 Vaccination Syndrome and Their Impacts on the Renin-Angiotensin System.Vaccines · 2026Review
- Characterizing persistent Post-COVID-19 vaccination symptoms using MedDRA system organ class and preferred term classifications.Scientific reports · 2026Article
- Myocardial and Vascular Involvement in COVID-19 and Post-Vaccination States: Understanding Injury Pathways and Clinical Implications.Life (Basel, Switzerland) · 2026Review
- Myocarditis After mRNA Vaccination: A Metabolic-Innate Immune Cascade Centered on Lipid Nanoparticles.Mediators of inflammation · 2026Review
- mRNA-based SARS-CoV-2 vaccines: intracellular processing and aggregation of the encoded spike protein as a mechanistic contributor to cardiac cellular stress.Frontiers in immunology · 2026Article
- Top 10 drugs most frequently associated with adverse events of myocarditis and pericarditis.Scientific reports · 2025Article
- History of COVID-19 as a Risk Factor for Cardiac Arrhythmias: A Case-Control Study.Cardiology research · 2025Article
- Improved diagnosis of COVID-19 vaccine-associated myocarditis with cardiac scarring identified by cardiac magnetic resonance imaging.Open heart · 2025Article
- Biological threat preparedness through vaccine development and stockpiling: challenges and strategic implications.Frontiers in public health · 2025Review
- Review
Corrections and comments
- Erratum issued
Authors and funding
63 authors.
Funding
Abstract
Background: We aimed to study the clinical characteristics, myocardial injury, and longitudinal outcomes of COVID-19 vaccine-associated myocarditis (C-VAM). Methods: In this longitudinal retrospective observational cohort multicenter study across 38 hospitals in the United States, 333 patients with C-VAM were compared with 100 patients with multisystem inflammatory syndrome in children (MIS-C). We included patients ≤30 years of age with a clinical diagnosis of acute myocarditis after COVID-19 vaccination based on clinical presentation, abnormal biomarkers and/or cardiovascular imaging findings. Demographics, past medical history, hospital course, biochemistry results, cardiovascular imaging, and follow-up information from April 2021 to November 2022 were collected. The primary outcome was presence of myocardial injury as evidenced by late gadolinium enhancement (LGE) on cardiac magnetic resonance (CMR) imaging. Findings: Patients with C-VAM were predominantly white (67%) adolescent males (91%, 15.7 ± 2.8 years). Their initial clinical course was more likely to be mild (80% vs. 23%, p < 0.001) and cardiac dysfunction was less common (17% vs. 68%, p < 0.0001), compared to MIS-C. In contrast, LGE on CMR was more prevalent in C-VAM (82% vs. 16%, p < 0.001). The probability of LGE was higher in males (OR 3.28 [95% CI: 0.99, 10.6, p = 0.052]), in older patients (>15 years, OR 2.74 [95% CI: 1.28, 5.83, p = 0.009]) and when C-VAM occurred after the first or second dose as compared to the third dose of mRNA vaccine. Mid-term clinical outcomes of C-VAM at a median follow-up of 178 days (IQR 114-285 days) were reassuring. No cardiac deaths or heart transplantations were reported until the time of submission of this report. LGE persisted in 60% of the patients at follow up. Interpretation: Myocardial injury at initial presentation and its persistence at follow up, despite a mild initial course and favorable mid-term clinical outcome, warrants continued clinical surveillance and long-term studies in affected patients with C-VAM. Funding: The U.S. Food and Drug Administration.
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