Supraventricular tachycardia (SVT)

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.

Causes of supraventricular tachycardia (SVT)

SVT happens when the electrical system that controls your heart rhythm is not working properly.

This causes your heart to suddenly beat much faster. It can then slow down abruptly.

A normal resting heart rate is 60 to 100 beats per minute (bpm). But with SVT your heart rate suddenly goes above 100bpm. This can happen when you're resting or doing exercise.

Symptoms of supraventricular tachycardia (SVT)

Having SVT means your heart suddenly beats faster.


You may get no other symptoms, but sometimes people also:

Non-urgent advice: See a GP if you keep getting a fast heartbeat

It's important to get it checked out. You might need a test, such as an electrocardiogram (ECG), to find out what's going on.

Immediate action required: Call 999 or go to A&E if:

  • you have been diagnosed with SVT and your episode has lasted longer than 30 minutes
  • you have sudden shortness of breath with chest pain

You need to go to hospital for treatment immediately.

Things you can do to help with supraventricular tachycardia (SVT)

If your episodes of SVT only last a few minutes and do not bother you, you may not need treatment.

You can make changes to your lifestyle to reduce your chances of having episodes, such as:

Your doctor may also be able to recommend some simple techniques to help stop episodes when they happen.

Treating supraventricular tachycardia (SVT) in hospital

SVT is rarely life threatening. But you may need treatment in hospital if you keep having long episodes.

This may include:

Find out more about:

Page last reviewed: 27 April 2021
Next review due: 27 April 2024