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Cardiac MRI
cardiac MRI · heart MRI · CMR · cardiac MRI with contrast
Images of the heart in a magnetic field. They show the muscle, valves, chambers, and how the heart pumps. No radiation.
For cardiomyopathy, after myocarditis or a heart attack, for heart defects from birth, or when a heart ultrasound gave no clear answer.
⏱ Duration: usually 45 to 60 minutes; the report in 1 to 3 days
Be sure to tell your doctor
How to prepare
- Food. A light meal is usually fine. If there will be a stress test with medicine, special rules apply. Check with the clinic.
- Coffee. If a stress test is ordered, coffee, tea, and chocolate are usually cut out for 24 hours before.
- Medicines. Do not stop them on your own. Tell your doctor. They will decide.
- Metal. Take off everything metal: jewelry, watches, hair clips, piercings. Leave your phone and cards in the locker.
What to bring
- Your referral
- Heart ultrasound, ECGs, and cardiologist reports
- A list of your medicines
- A creatinine test, if asked
How it goes
- An IV line is put in a vein
- ECG stickers are put on your chest
- You lie on your back, and a coil is placed on your chest
- You are asked many times to hold your breath for 10 to 15 seconds
- The machine knocks loudly. You get headphones
- Halfway through, contrast is given and more images are taken
What you'll feel
- It does not hurt, but it is loud and tight
- Holding your breath is tiring. You can ask for a break
- With contrast: a cool feeling in the vein
Afterwards
- You can go back to your day right away
- After contrast, drink more water, unless your doctor said otherwise
- Take the report to a cardiologist
Contact a doctor straight away if
- Pressing chest pain, shortness of breath, or fainting: call emergency services right away
- After contrast: itching, a rash, a swollen face, or trouble breathing. Tell the staff right away or call emergency services
Common questions
Why does it take so long?
The heart moves, so images are timed to your heartbeat and breathing. Many series are needed.
Can I have a cardiac MRI with a pacemaker?
Only if it is MRI-safe and your cardiologist approves. Tell staff in advance.