MRI scans of the heart are designed to help cardiologists make clear diagnoses about what is wrong with the heart.
An MRI scan is a type of scan that makes detailed images of the body without using ionising radiation. This type of scan works by aligning the body’s protons (little particles present in each hydrogen atom found in the molecules of water inside the body) within a large magnetic tube and then applying short radio waves to the body. These radio waves change the alignment of the protons, and when the radio waves are turned off, the protons realign and emit radio signals which are taken up by the receivers and made into an image.
These signals carry information on the exact position of the individual protons and help in differentiating the types of tissues in the body since each type of tissue produces different signals. Computers are used to show an image of the body in a very detailed format.
When used for the heart, MRI scanning helps assess the structure and function of the heart, and whether there is scarring or infiltration of the heart muscle. It can also be used to assess the blood supply to the heart.
Cardiac MRI is very useful in a variety of settings but is particularly useful in assessing the function of the heart and assessing cardiomyopathy (diseases of the heart muscle). It is the gold-standard for identifying scar in the heart but is also very good at looking for problems with the blood supply or assessing the consequences of valve problems such as enlargement of the heart chambers.
A CMR scan lasts for about 45-60 minutes and is operated by a radiographer who communicates to the patient through an intercom. For this procedure, you will be asked to lie down on a bed which is then moved inside the scanner. You will be provided with some earplugs or headphones.
You will have a small plastic tube (cannula) inserted into your arm and this is often used to give you gadolinium contrast towards the end of the scan. This helps your doctor decide if there is any scar in the heart.
If your doctor has queried whether there are any narrowings in the arteries supplying the heart, you may undergo a stress scan in which you receive a medication through the cannula which send a signal to the heart to exercise. This medication (adenosine) can cause temporary chest tightness and breathlessness and a flushing sensation but this resolves quickly once it is turned off.
Some patients may feel slightly claustrophobic but can manage with reassurance. Even if you cannot manage, there is an Open MRI scanner at My Heart Clinic which almost all patients can manage.
The risks of a reaction to gadolinium contrast is extremely low and the team looking after you are trained what to do if this happens. If you are having a stress scan, there is a very small chance (around 1 in 1000) of a reaction or rhythm problem due to the medication.
Cardiac MRI is a key test in ensuring the correct diagnosis for cardiac patients. Our expert Consultant Cardiologists regularly use Cardiac MRI and are specialist in its use. They are available for consultation on any day of the week and weekends as well.
MAKE AN APPOINTMENT
020 31372439