Heart MRI scan

What is a heart MRI scan?

Magnetic resonance imaging (MRI) is a scan that uses a combination of radio waves and a magnetic field to create a detailed picture of your internal bodily structure. We can use MRI scans to see a detailed picture of your heart and blood vessels without needing invasive procedures. 

MRIs can produce more detailed images than CT scans. They can also be a safer alternative to CT scans because radiation is not needed for the procedure. This means that this scan may be more appropriate for those who cannot have a CT scan, such as pregnant women.

Preparation

As an MRI scan uses a magnetic field, nothing metallic can be taken into the examination room. This means you will have to notify us beforehand if you have any of these items:

• Jewellery and piercings 
• A medical implant, such as a pacemaker or implantable cardiac defibrillator (ICD)
• Coronary stents
• An artificial heart valve
• A history of metal going into your eyes
• Any shrapnel or metal that has gone into your body
• Any type of metal implant from previous surgeries

It is also essential to tell us about the following: whether you have had surgery on your brain or head, are pregnant or might be, have asthma or chronic obstructive pulmonary disease (COPD) and use inhalers, have any kidney problems, or weigh more than 102 kg (16 stone).

You will need to stop consuming caffeine and taking certain medications beforehand. We will discuss your current medications and whether we need to adjust your intake to perform the test. 

You will also need to stop smoking or avoid exercise on the day of the procedure.

Avoid oils and heavy moisturisers before the procedure, as these will interfere with the gel and cause the electrodes to not stick as well to the skin. Hair may also interfere with the electrodes, so we might advise you to remove chest hair beforehand.

Procedure

Before the procedure begins, we will ask you to change into a gown and remove anything metallic from your person. This test is painless and does not require anaesthesia.

We will ask you to lie on a padded examination table, which will pass through the tube of the MRI machine. Once the scan starts, the machine will make loud noises as it takes pictures of your body. We can offer ways to drown out the machine’s noise and help you pass the time.

You will need to keep still during the scan so we can get the clearest images possible. You may also need to hold your breath during the scan, but it will only take a matter of seconds to take the imaging.

You may feel slightly claustrophobic in the machine. Please let us know if you’re uncomfortable during the scan or nervous beforehand so we can help you through this process.

During the test, you’ll be attached to a heart monitor recording your heart rate and rhythm and a probe measuring your oxygen levels on your finger. Please speak up if you feel unwell or uncomfortable at any point.

Once we’ve captured the images, the table will slowly move out of the machine, and you can leave the examination room. This scan should take 30 to 90 minutes to complete in total.

Results and aftercare

Once the scan is completed, you can get dressed and return to your normal daily activities, including driving.

No aftercare is needed for this scan.

After the procedure, we will analyse your results and schedule a follow-up appointment to discuss your next steps. Please notify us immediately if your symptoms worsen or if you develop new symptoms after the test.

Results are often ready within three to seven working days.

Frequently asked questions

Is a heart MRI safe?

The test is generally safe and painless. It does not use radiation, but relies on a strong magnet and radio waves. Most people can have the scan, but there are restrictions for those with certain implants or devices or for people with severe kidney problems.

Are there risks or side effects?

Risks are generally minimal. There is a very small risk of an allergic reaction to the contrast dye if it is used. The scan is not recommended for some people with severe kidney disease, certain implants, or during early pregnancy.

Will I be claustrophobic during the procedure?

It’s common for people to feel claustrophobic during a heart MRI scan, as the test involves lying still inside a tunnel-like machine. If you have a fear of confined spaces, you may experience anxiety or discomfort. However, let us know in advance, and we can help you prepare beforehand. Discussing your concerns beforehand ensures our team can support you and make the experience as comfortable as possible.

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