LAB TEST
Heart MRI
Heart magnetic resonance imaging is an imaging method that uses powerful magnets and radio waves to create pictures of the heart. It does not use radiation (x-rays). Single magnetic resonance imaging (MRI) images are called slices. The images can be stored on a computer or printed on film. One exam produces dozens or sometimes hundreds of images. The test may be done as part of a chest MRI .
How the Test is Performed
You may be asked to wear a hospital gown or clothing without metal fasteners (such as sweatpants and a t-shirt). Some types of metal can cause blurry images or be attracted to the powerful magnet. You will lie on a narrow table, which slides into a large tunnel-like tube. Some exams require a special dye (contrast).…
How to Prepare for the Test
You may be asked not to eat or drink anything for 4 to 6 hours before the scan. Tell your health care provider if you are afraid of close spaces (have claustrophobia). You may be given a medicine to help you feel sleepy and less anxious, or your provider may suggest an "open" MRI, in which the machine is not as close…
How the Test will Feel
A heart MRI exam causes no pain. Some people may become anxious when inside the scanner. If you have a hard time lying still or are very anxious, you may be given medicine to relax. Too much movement can blur MRI images and cause errors. The table may be hard or cold, but you can ask for a blanket or pillow. The…
Why the Test is Performed
MRI provides detailed pictures of the heart and blood vessels from many views. Often, it is used when more information is needed after you have had an echocardiogram or heart CT scan. MRI is more accurate than CT scan or other tests for certain conditions, but less accurate for others. Heart MRI may be used to…
What Abnormal Results Mean
Abnormal results may be due to many things, including: Heart valve disorders Fluid in the sac-like covering around the heart ( pericardial effusion ) Tumor of the blood vessels or around the heart Atrial myxoma or another growth or tumor in the heart Congenital heart disease (heart problem that you are born with)…
Risks
There is no radiation involved in MRI. The magnetic fields and radio waves used during the scan have not been shown to cause any significant side effects. Allergic reactions to the dye used during the exam are rare. The most common type of contrast (dye) used is gadolinium. It is very safe. The person operating the…
References
Kramer CM, Dilsizian V, Hagspiel KD. Noninvasive cardiac imaging. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine . 27th ed. Philadelphia, PA: Elsevier; 2024:chap 44. Kwong RY. Cardiovascular magnetic resonance imaging. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart…
This is a summary. Read the full article at www.ucsfbenioffchildrens.org (reviewed 27/02/2024).
This page is general information and is not medical advice. It does not replace a registered doctor, and it is not a prescription or a recommendation to use any medicine or test. Prices are listed prices and may change. Always follow the advice of your doctor or pharmacist.