Greater risk for heart damage and death is from becoming infected with COVID-19. Around 60% of people who are seriously ill with COVID-19 can have an injury to their heart, and nearly 1% of fit athletes who had a mild COVID-19 infection show myocarditis on an MRI.
Case series in JAMA Cardiology studied 23 men in the U.S. military who were hospitalized with myocarditis within four days of receiving the second jab of messenger RNA COVID-19 vaccine. Three of the patients previously had been infected with COVID-19, and their symptoms started after the first dose of the vaccine.
The cases occurred between January and April. Sixteen had received the Moderna vaccine and seven had received the Pfizer vaccine. For context, it is important to note that the military administered more than 2.8 million doses of messenger RNA COVID-19 vaccines during that time.
All 23 patients had symptoms of severe chest pain and significantly elevated cardiac troponin levels, which is a protein marker used to measure heart damage.
Each patient got rapidly recovered, which, supports the diagnosis of hypersensitivity myocarditis, which is usually related to a drug allergy, but it has been researched in relation to the smallpox vaccine.
“Hypersensitivity myocarditis following vaccination is rare, with the exception of smallpox vaccine. The risk of myocarditis after receiving mRNA vaccine is far less than the risk of myocarditis following actual COVID-19 infection,” says Leslie Cooper, M.D., chair of the Department of Cardiology at Mayo Clinic in Florida. Dr. Cooper is senior author of the study, which was conducted with U.S. military medical centers.
One more observational case study recorded details of eight men between the ages of 21 and 56 who were hospitalized with chest pain and diagnosed with myocarditis by laboratory and cardiac MRI.
The patients developed symptoms, starting with a fever, within two to four days of receiving their second dose of a COVID-19 vaccine. One patient who had previously recovered from COVID-19 had symptoms after the first dose.
All eight patients in the study recovered from the effects of myocarditis and no longer had chest pain. The findings, co-authored by Dr. Cooper with researchers from Mayo Clinic and other medical institutions in the U.S. and Italy, are published in Circulation.
“People of all ages should choose to get a COVID-19 vaccine because the risks are extremely low compared to the benefits. Additionally, the growing body of research shows that vaccine-associated myocarditis resolves quickly in almost all cases,” says Dr. Cooper
Source: Medindia
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