Covid-19 may have a hidden impact on the heart, including that of healthy athletes

‘Last month, several college conferences, the Big Ten and the Pac 12 among them, postponed their sports seasons, including football, citing the risks posed to athletes by the coronavirus. A major factor in those decisions, according to some physicians, was the uncertain implications of a July paper in JAMA Cardiology. In this study of 100 people who had Covid-19, M.R.I.’s showed at least some signs of myocarditis in 60 of them, meaning they had inflammation in the heart muscle, which can weaken the organ and, on rare occasions, lead to sudden cardiac arrest. Another study, published this month in the same journal, looked at 26 Ohio State athletes who experienced Covid-19 with mild or no symptoms and detected evidence of possible myocarditis in five of them and lesser abnormalities in nine more. The condition poses a heightened risk to those whose physical activity puts stress on the heart: Even before the pandemic, myocarditis was a leading cause of death in young, otherwise healthy athletes.’

Read here (New York Times, Sept 23, 2020)

The core lesson of the Covid-19 heart debate

‘Autopsies have found traces of the coronavirus’s genetic material in the heart, and actual viral particles within the heart’s muscle cells. Experiments have found that SARS-CoV-2 can destroy lab-grown versions of those cells. Several studies have now shown that roughly 10 to 30 percent of hospitalized COVID-19 patients had high levels of troponin—a protein released into the blood when the heart’s muscle cells are damaged. Such patients are more likely to die than others with no signs of heart injury.

‘This is worrying for people with severe symptoms, but more recently, a few studies suggested that COVID-19 can cause heart inflammation, or myocarditis, even in people who showed mild symptoms, or had recovered. These results were controversial but concerning. Myocarditis is frequently caused by viruses, and resolves on its own in many cases. But it can progress to more severe heart problems, and is one of the leading causes of sudden death in young adults. These studies contributed to decisions by two college football conferences—the Big Ten and the Pac-12—to cancel their fall season. (The Big Ten has since reversed its call, and the Pac-12 is considering doing the same)’

Read here (The Atlantic, Sept 21, 2020)