Viruses most common cause of myocarditis in kids, American Heart Association says


While myocarditis has been in the headlines lately due to rare occurrences in mRNA COVID-19 vaccine recipients, it’s viruses that are the most common cause of the condition in children, the American Heart Association (AHA) said. And while many cases resolve on their own, a statement from the group, which was published in Circulation, addressed treatment guidelines in recovering patients.

Myocarditis, which is along with pericarditis and endocarditis is one of the main types of heart inflammation, can temporarily or permanently weaken the heart muscle and the heart’s electrical system which could impact how the heart pumps. In the U.S., approximately 10 to 20 per 100,000 people are diagnosed with it each year, with children accounting for 1 to 2 per 100,000 incidents, according to the AHA.

Signs and symptoms may present as fatigue, shortness of breath, fever, chest pain and palpitations, but they can range in children from minimal to showing signs of heart failure, life-threatening arrhythmias or cardiogenic shock, the AHA warned. In patients with suspected myocarditis, diagnosing the condition could include non-invasive testing or blood screening to measure for elevated cardiac enzymes, or an echocardiogram or an MRI. Electrocardiography (ECG) can also assess heart rhythm and show signs of injury to the heart or signs of pericarditis as well. Previously, biopsies were usually taken, which would also indicate if a virus was present.

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