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Coronary angioplasty and stents

Coronary angioplasty is a treatment that helps improve the blood supply to your heart where a special kind of balloon is gently inflated inside the coronary artery. Many people also have a stainless steel mesh called a stent positioned which allows blood to flow normally again.

Your coronary arteries play a vital role in keeping your heart healthy. But in some people, the coronary arteries can become narrowed or blocked because fatty deposits, called atheroma, have built up within the artery walls.

Coronary angioplasty widens narrowed coronary arteries and allows blood to flow through again.

Angioplasty can help to relieve angina symptoms and is also used as an emergency treatment for people who've had a heart attack.

What happens during an angioplasty?

You’ll have an angiogram before your angioplasty to look inside your arteries and check where these blockages are and how much they're blocked. An angiogram often happens as part of the same procedure.

An angioplasty normally takes between 30 minutes and two hours, although it can take longer.

  • Illustration of a blood vessel with a catheter insertedAt the start of the procedure you'll be given a local anaesthetic to numb the area. Then a catheter – a fine, flexible, hollow tube –  is passed into an artery in either your groin or your arm. At the tip of the catheter is a small inflatable balloon and a small tube of stainless steel mesh, called a stent.


  • Illustration of balloon angioplasty in a blood vesselSome dye (contrast) is injected into the catheter so that your arteries can be seen on an x-ray screen. This helps show where the narrowings in your arteries are, and how severe they are. It's normal to feel a hot flushing sensation when the dye is injected.


  • The catheter is then passed up to your heart and into a coronary artery until its tip reaches a narrow or blocked section.


  • Illustration of a balloon being expanded with a stent to hold open a blocked blood vesselThe balloon on the end of the catheter is then gently inflated so that it squashes the fatty deposits (the atheroma) against the artery wall, widening the artery.


  • Illustration of a blood vessel held open by a stentAs the balloon is inflated, the stent in place on the balloon expands so that it acts as a scaffold and holds open the artery. The balloon is deflated and removed, leaving the stent in place.


Some people may feel a palpitation, and you might feel some angina. If you feel unwell, or have pain at any time during the procedure, tell the team.

When the test is over, the catheters are removed. Sometimes there might be a small amount of bleeding when they’re taken out. A nurse or doctor will press on the area for a short while or they may put in a plug called an angioseal to stop any bleeding. After the procedure, you’ll need to stay in bed for a while.

In the first few hours afterwards you might get some chest discomfort. If this happens, tell the doctor or nurse.

Leaving hospital after an angioplasty

Most people can go home the same day or the next day, but if you’ve had an emergency angioplasty it’s likely you’ll need to stay in hospital for longer.

When you get home, check the area where the catheter was inserted. Expect to have some bruising and tenderness, but if you get any redness or swelling, or if the bruising worsens, contact your doctor.

Before you leave hospital, someone will have a chat with you about your recovery and what you can and can’t do. It’s normal to feel tired afterwards but most people find that they’re back to normal after a few days. However if you’ve also had a heart attack, it will take longer to recover.

  • It’s best to avoid doing any demanding activities, such as heavy lifting, for a week or so.
  • You shouldn’t drive for at least a week after having angioplasty – longer if you also had a heart attack.
  • If you’ve had a planned angioplasty with no complications you may be able to return to work within a few days, depending on the type of work you do.
  • If you’ve had an emergency angioplasty or a heart attack you may need to take a few weeks off.

You should also be invited to go on a cardiac rehabilitation programme, a course of exercise and information sessions that help you to recover as quickly as possible.

If you have a stent, you’ll need to take certain anti-platelet drugs (such as aspirin or clopidegrel) to help reduce the risk of blood clots forming in and around the stent.

Stents are not affected by security systems at airports or MRI scans.

What should I do if I get chest pain after I get home?

If you get chest pain, stop and rest and take your GTN as prescribed. If the pain doesn't ease, call 999 immediately. You could be having a heart attack.

How successful is coronary angioplasty?

In most cases the blood flow through the artery is improved. Many people find that their symptoms get better and they’re able to do more.

Sometimes the artery can become narrowed again, causing angina to return. But advances in stent technology mean that the risk of this happening is getting lower. Many people are now symptom-free for a long time.

A small number of people have complications. The risk varies depending on your overall health and your individual heart condition. Have a chat with your doctor about the benefits and possible risks of having an angioplasty and any concerns you may have.

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Our researchers are working to improve angioplasty techniques and to find ways of preventing arteries from becoming narrow again after angioplasty.

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