893. Myocarditis and Pericarditis as a Complication of Mpox: An International Case Series and Literature Review
Bibliographic record
Abstract
Abstract Background Mpox virus was declared a public health emergency of international concern by the World Health Organization in July 2022. The full range of clinical manifestations of this emerging infectious disease continues to be elucidated. Methods We present a case series and literature review of patients with mpox myocarditis and pericarditis, including demographics, clinical symptoms, diagnostic and management strategies, and outcomes. Results We identified 13 patients aged 21-51 (median 32) years with polymerase chain reaction-confirmed mpox and myopericarditis (n=3), pericarditis (n=1), or myocarditis (n=9), from 6 countries on 3 continents. All but one were men. One was HIV-positive (viral load undetectable) and 4 were on HIV pre-exposure prophylaxis. None had prior cardiac disease and 3 used tobacco. Most acquired mpox via sexual contact; one heterosexual patient reported non-sexual close contact. Cutaneous/mucosal lesions occurred in 11/13 patients, and fever in 11/13. Where reported, cardiac symptom onset was 2-8 (median 5.5) days after mpox illness onset. C-reactive protein ranged from 9.3-154.5 (median 52.6) mg/L. Diagnosis of myocarditis/myopericarditis was based on symptoms (chest discomfort 11/12, dyspnea 3/4), elevated troponin (range 165-21200 ng/L, peaking 1-2 days after cardiac symptom onset), supportive electrocardiogram (ECG) findings (diffuse or territorial ST elevation, T-wave inversions, and/or non-specific ECG changes 9/12), and/or cardiac imaging findings (pericardial effusion 1/12, left ventricle [LV] abnormalities on echocardiogram 4/12, abnormal cardiac MRI in 7/7 done acutely). In the pericarditis case, ECG showed widespread ST elevation and echocardiogram showed hyperdynamic LV. Treatments included ASA or non-steroidal anti-inflammatory drugs (n=7), tecovirimat (n=5), colchicine (n=4), ACE-inhibitors (n=3) and bisoprolol (n=3). All were hospitalized, with lengths of stay of 4-10 days, and at least 3 patients required intensive care. Cardiac symptom recovery occurred within 1-3 days of admission; in at least 1 patient symptoms continued beyond 1 month. Conclusion Mpox is rarely associated with myocarditis and/or pericarditis, with cardiac symptoms beginning on day 2-8 after illness onset. Long-term outcomes require further study. Disclosures Cécile Tremblay, MD, Association canadienne de protection médicale: Expert Testimony|Astra-Zeneca: Advisor/Consultant|Astra-Zeneca: Honoraria|Canadian Institutes of Health Research: Grant/Research Support|Gilead: Advisor/Consultant|Gilead: Grant/Research Support|Gilead: Honoraria|GlaxoSmithKline: Advisor/Consultant|GlaxoSmithKline: Honoraria|Medicago: Advisor/Consultant|Merck: Advisor/Consultant|Merck: Grant/Research Support|Merck: Honoraria|National Institute of Health: Grant/Research Support|Sanofi: Advisor/Consultant Darrell H. S. Tan, MD PhD, Abbvie: Grant/Research Support|Gilead: Grant/Research Support|Glaxo Smith Kline: Grant/Research Support
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.008 | 0.007 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".