Cardiology

Q&A: COVID-19 vaccination and heart issues

DEAR MAYO CLINIC: I have been hearing about an increase in the number of young people who are developing heart issues, including myocarditis, after being vaccinated for COVID-19. Can you explain this condition? I have a 15-year-old ...

Cardiology

First of our three billion heartbeats is sooner than we thought

When does our heart first start to beat? Until now, researchers thought that the first time our heart muscle contracted to beat was at eight days after conception in mice, which equates to around day 21 of a human pregnancy.

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