What to do if the contrast injection leaks out (Extravasation)

This page gives information on what you should do if the contrast injection that you were given for your MRI or CT scan has leaked out under your skin (extravasation). If you have any further questions, please speak to a member of staff caring for you.

What is extravasation?

Contrast dyes that are given to patients having an MRI or CT scan are usually given by injection into a vein in your arm or hand. Occasionally this injection may leak out from the vein to the tissues under the skin – this is known as extravasation. If this has happened, you will experience a stinging sensation where the contrast has gone into the tissue and it can be painful. This will usually wear off after about 30 minutes. You may also have some swelling of the arm or hand – please read the paragraph below on what to do if this happens.

Sometimes you may need another injection of contrast and if necessary, this will be discussed with you.

What will happen if there has been a leak?

We will massage and elevate your arm as soon as the leak happens. A cold compress will be applied to the area if required and, if possible, we will then continue with the scan.

If the extravasation is severe, a doctor will examine you before you leave the department and advise you if any further treatment is necessary.

Is there anything I can do at home?

• Yes you can massage the area where the contrast has gone into the tissue.
• If there is swelling:
  • You should elevate the affected arm as much as possible. At night, keep it elevated on two pillows (you should continue to do this until the swelling has gone down)
  • You can use an ice-pack or a bag of frozen vegetables wrapped in a clean tea towel over the site. Never place ice directly on skin as it may cause frostbite, and do not leave it on for more than 15 minutes at a time.
• If the area is painful, take your usual painkillers.

Is there anything I need to look out for?

In most cases this is a minor injury and does not require any treatment. However, in a small number of cases the injury is more severe and you will need to seek medical attention.

IMPORTANT INFORMATION

• If you experience any of the following symptoms, you should seek advice from your GP or attend your local Accident and Emergency (A&E) department. Please take this leaflet with you:
  • The pain becomes more severe and cannot be controlled by simple painkillers
  • There is increased swelling of the arm or hand
  • The arm or hand changes colour
  • You experience pins and needles or altered sensation in the arm or hand
  • There is blistering or ulceration of the skin around the injection site

If you require this information in a different format please let us know via customercare@alliance.co.uk