Supraventricular tachycardia (SVT) is a condition where your heart suddenly beats much faster than normal. It’s not usually serious, but some people may need treatment. What is supraventricular tachycardia (SVT)? SVT happens when the electrical system that controls your heart rhythm is not working properly.
https://www.nhs.uk/conditions/supraventricular-tachycardia-svt/

