Journal-based CME Course: Myocarditis Following Immunization With mRNA COVID-19 Vaccines in Members of the US Military

Activity ID

11984

Expires

August 4, 2024

Format Type

Journal-based

CME Credit

1

Fee

$30

CME Provider: JAMA Cardiology

Description of CME Course

Importance  Myocarditis has been reported with COVID-19 but is not clearly recognized as a possible adverse event following COVID-19 vaccination.

Objective  To describe myocarditis presenting after COVID-19 vaccination within the Military Health System.

Design, Setting, and Participants  This retrospective case series studied patients within the US Military Health System who experienced myocarditis after COVID-19 vaccination between January and April 2021. Patients who sought care for chest pain following COVID-19 vaccination and were subsequently diagnosed with clinical myocarditis were included.

Exposure  Receipt of a messenger RNA (mRNA) COVID-19 vaccine between January 1 and April 30, 2021.

Main Outcomes and Measures  Clinical diagnosis of myocarditis after COVID-19 vaccination in the absence of other identified causes.

Results  A total of 23 male patients (22 currently serving in the military and 1 retiree; median [range] age, 25 [20-51] years) presented with acute onset of marked chest pain within 4 days after receipt of an mRNA COVID-19 vaccine. All military members were previously healthy with a high level of fitness. Seven received the BNT162b2-mRNA vaccine and 16 received the mRNA-1273 vaccine. A total of 20 patients had symptom onset following the second dose of an appropriately spaced 2-dose series. All patients had significantly elevated cardiac troponin levels. Among 8 patients who underwent cardiac magnetic resonance imaging within the acute phase of illness, all had findings consistent with the clinical diagnosis of myocarditis. Additional testing did not identify other etiologies for myocarditis, including acute COVID-19 and other infections, ischemic injury, or underlying autoimmune conditions. All patients received brief supportive care and were recovered or recovering at the time of this report. The military administered more than 2.8 million doses of mRNA COVID-19 vaccine in this period. While the observed number of myocarditis cases was small, the number was higher than expected among male military members after a second vaccine dose.

Conclusions and Relevance  In this case series, myocarditis occurred in previously healthy military patients with similar clinical presentations following receipt of an mRNA COVID-19 vaccine. Further surveillance and evaluation of this adverse event following immunization is warranted. Potential for rare vaccine-related adverse events must be considered in the context of the well-established risk of morbidity, including cardiac injury, following COVID-19 infection.

Disclaimers

1. This activity is accredited by the American Medical Association.
2. This activity is free to AMA members.

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