'Covid-19 Is Creating a Wave of Heart Disease'

Haider Warraich, a cardiologist, writing for the New York Times: An intriguing new study from Germany offers a glimpse into how SARS-CoV-2 affects the heart. Researchers studied 100 individuals, with a median age of just 49, who had recovered from Covid-19. Most were asymptomatic or had mild symptoms. An average of two months after they received the diagnosis, the researchers performed M.R.I. scans of their hearts and made some alarming discoveries: Nearly 80 percent had persistent abnormalities and 60 percent had evidence of myocarditis. The degree of myocarditis was not explained by the severity of the initial illness.

Though the study has some flaws, and the generalizability and significance of its findings not fully known, it makes clear that in young patients who had seemingly overcome SARS-CoV-2 it's fairly common for the heart to be affected. We may be seeing only the beginning of the damage. Researchers are still figuring out how SARS-CoV-2 causes myocarditis -- whether it's through the virus directly injuring the heart or whether it's from the virulent immune reaction that it stimulates. It's possible that part of the success of immunosuppressant medications such as the steroid dexamethasone in treating sick Covid-19 patients comes from their preventing inflammatory damage to the heart. Such steroids are commonly used to treat cases of myocarditis. Despite treatment, more severe forms of Covid-19-associated myocarditis can lead to permanent damage of the heart -- which, in turn, can lead to heart failure.

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