Heart racing suddenly during workouts or daily activity? Doctors explain supraventricular tachycardia (SVT), its symptoms, causes, and when to seek help.

DENVER — Heart disease in young people is certainly possible. Supraventricular tachycardia (SVT) can affect kids, adolescents and young adults. It occurs in about 2 out of every 1,000 people. SVT ...

If your heart suddenly shoots up to 150–170 bpm during exercise or even at rest, doctors say it could be supraventricular ...