Harvard Heart Letter

Putting the brakes on a racing heart

A rapid heartbeat can be frightening, but this often-fleeting problem is usually harmless. If you’re exercising or feeling very nervous, you expect your heart to beat faster than normal. But what if your heart sometimes starts racing out of the blue, for no apparent reason? You might have supraventricular tachycardia, or SVT. SVT is an umbrella term that covers several different types of rapid heart rhythms, all of which are caused by…

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