Introduction
Cardiac MRI is a detailed, non-invasive scan. It can help assess heart muscle conditions, scar, inflammation, heart structure and pumping function. It may also provide information about blood flow and valves. The scan is recommended when its detail will add something meaningful to the assessment.
What to expect
You lie on a table that moves through the scanner while images are taken. The machine is noisy, but you will have contact with the radiography team throughout. Some scans use contrast dye through a small cannula. The appointment may take longer than other tests because several image sequences are needed.
MRI departments screen carefully for implants, kidney problems, pregnancy and claustrophobia. Many modern cardiac devices can be scanned under the appropriate protocol, but this must always be checked in advance.
Key points
- MRI can provide detail about the heart muscle that an echocardiogram cannot always show.
- It is painless, but requires you to lie still and follow short breath-hold instructions.
- Preparation and suitability are checked individually, particularly when contrast dye or an implanted device is involved.
Patient note
“MRI is a powerful test, but it is not simply ‘more imaging’. It is used when its particular detail is likely to make a difference to the decision.”
Questions about cardiac MRI
What question is the MRI answering? Will I need contrast dye? Is my implant or medical history relevant? How long should I allow for the appointment?
FAQ
Can I have an MRI if I have a pacemaker or ICD?
Many people can, but the device and lead details must be checked and a specialist scanning protocol may be needed. Never assume an MRI is suitable without the device team confirming it.
Is MRI safe?
MRI does not use X-rays. The screening process is important because the strong magnet can interact with some metal or electronic implants.