• Internal medicine · Feb 2022

    Case Reports

    Myocarditis Following a COVID-19 Messenger RNA Vaccination: A Japanese Case Series.

    • Yoshiki Murakami, Masaya Shinohara, Yosuke Oka, Ryo Wada, Ryota Noike, Hiroshi Ohara, Tadashi Fujino, and Takanori Ikeda.
    • Department of Cardiovascular Medicine, Toho University Graduate School of Medicine, Japan.
    • Intern. Med. 2022 Feb 15; 61 (4): 501-505.

    AbstractCOVID-19 vaccine-related myocarditis has been reported worldwide. We herein report two Japanese cases with suspected vaccine-related myocarditis. A 27-year-old man was admitted with chest pain 4 days after the second vaccination. An electrocardiogram (ECG) did not reveal any significant abnormalities. The second patient, a 37-year-old man, was admitted with chest pain 9 days after the first vaccination. His ECG exhibited ST-elevation in multiple leads. In both cases, cardiac magnetic resonance imaging findings were consistent with myocarditis. They recovered with symptomatic relief within a few days. These cases suggest that the benefit of COVID-19 vaccination exceeds the risk of vaccine-related myocarditis.

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