Cardiac MRI

Overview

A cardiac MRI (magnetic resonance imaging) is a safe, non-invasive test that uses strong magnets and radio waves to create detailed pictures of your heart. It helps doctors see the heart's structure, how well it is pumping blood, and detect any problems with the heart muscle, valves, or blood vessels.

Cardiac MRI is a common test used when other heart tests, like echocardiograms or stress tests, do not give enough information. It is widely available in hospitals and specialist centres.

Cardiac MRI is used for people of all ages – from children with congenital heart conditions to older adults with coronary artery disease or heart failure.

Symptoms

Common symptoms

• Chest pain or discomfort
• Shortness of breath during activity or at rest
• Irregular or fast heartbeat (palpitations)
• Unexplained tiredness or fatigue
• Swelling in the legs, ankles, or feet (oedema)

Symptoms in children

• Difficulty feeding or poor weight gain (in infants)
• Blue or grey skin colour (cyanosis)
• Rapid breathing or breathlessness during play
• Fainting or dizziness during exercise

Symptoms in older adults

• Chest pain that comes and goes
• Shortness of breath with mild activity
• Sudden confusion or weakness (could signal reduced blood flow)
• Swelling in the legs or abdomen
• Irregular heartbeat that causes light-headedness

Causes

Main causes

• Coronary artery disease – narrowed arteries that reduce blood flow to the heart
• Cardiomyopathy – disease of the heart muscle that makes it weaker or thicker
• Heart valve problems – valves that do not open or close properly
• Pericarditis – inflammation of the sac around the heart
• Congenital heart defects – heart problems present from birth

Risk factors

• High blood pressure (hypertension)
• Diabetes
• High cholesterol
• Smoking or tobacco use
• Family history of heart disease
• Being overweight or obese
• Lack of physical activity
• Unhealthy diet high in salt, sugar, and saturated fat

When to see a doctor

See a doctor urgently if:

• If you have sudden, severe chest pain or difficulty breathing, call your local emergency number immediately.
• If you faint or pass out without a clear reason, seek urgent medical attention.

Book a routine appointment if:

• If you have ongoing chest pain, shortness of breath, or palpitations, make an appointment with your doctor.
• If you have a known heart condition and notice new or worsening symptoms, contact your heart specialist.
• If your doctor recommends a cardiac MRI as part of your evaluation, follow their advice.

Diagnosis

A cardiac MRI is often used after other tests, such as an echocardiogram or electrocardiogram (ECG), have suggested a heart problem. The scan gives very detailed images that help doctors confirm the diagnosis.

Tests that may be done

• Cardiac MRI scan
• Echocardiogram (ultrasound of the heart)
• Electrocardiogram (ECG) – records the heart's electrical activity
• Blood tests – to check for heart muscle damage or other conditions
• Stress test – to see how the heart works during exercise

What to expect at your appointment

Before the scan, you will remove any metal objects (like jewellery or watches) and change into a hospital gown. You will lie on a table that slides into the MRI machine. The machine makes loud knocking noises, but you will be given earplugs or headphones. You may be given a contrast dye injection through a vein in your arm to make the images clearer. You need to lie very still for about 30 to 60 minutes. The scan is painless, and you can go home the same day.

Treatment

Treatment for heart conditions found during a cardiac MRI depends on the specific problem. Your doctor will discuss the best options with you based on your age, overall health, and the severity of the condition.

Self-care at home

• Eat a heart-healthy diet low in salt, saturated fat, and added sugars
• Aim for at least 150 minutes of moderate exercise per week (after checking with your doctor)
• Stop smoking and avoid second-hand smoke
• Limit alcohol intake
• Manage stress with relaxation techniques or hobbies

Medical treatments

Medications may be prescribed to manage blood pressure, cholesterol, or heart rhythm problems. Some people may need procedures such as angioplasty (opening narrowed arteries) or implantation of a pacemaker. Always follow your doctor's advice and take any prescribed medicines exactly as directed.

When is surgery considered?

In some cases, surgery may be needed – for example, to repair or replace a heart valve, or to perform coronary artery bypass grafting (CABG) to improve blood flow to the heart. Your doctor will explain whether surgery is right for you.

Living with this condition

After a cardiac MRI, you can return to your normal activities right away unless your doctor advises otherwise. If a heart condition is found, you may need to make some changes to your daily routine, such as taking medicines and attending regular check-ups.

Lifestyle tips

• Stay physically active within your limits
• Follow a heart-friendly diet
• Get enough sleep (7–9 hours per night)
• Avoid heavy lifting or strenuous activity until your doctor says it is safe
• Keep a record of your symptoms to share with your doctor

Diet and exercise

Eat plenty of fruits, vegetables, whole grains, and lean proteins like fish or chicken. Limit processed foods, sugary drinks, and red meat. For exercise, walking, swimming, or cycling are good options. Always start slowly and increase gradually. Ask your doctor or a cardiac rehabilitation team for a personalised plan.

Mental health and emotional wellbeing

Learning that you have a heart condition can be stressful and scary. It is normal to feel anxious, sad, or overwhelmed. Talk to your doctor or a counsellor about your feelings. If you ever have thoughts of harming yourself, reach out to a crisis support service or a mental health professional immediately.

Prevention

While not all heart conditions can be prevented, you can lower your risk by adopting a healthy lifestyle. Controlling blood pressure, cholesterol, and diabetes, eating a balanced diet, exercising regularly, and not smoking can make a big difference.

Screening programmes

Screening for heart disease is not routine for everyone. If you have risk factors like high blood pressure or a family history of heart disease, your doctor may recommend regular check-ups and tests such as blood pressure measurement, cholesterol tests, or an ECG.

Complications

If left untreated

• Heart failure – when the heart cannot pump enough blood to meet the body's needs
• Heart attack – damage to the heart muscle from blocked blood flow
• Stroke – when blood flow to part of the brain is blocked
• Serious heart rhythm problems that can cause fainting or sudden cardiac arrest
• Damage to other organs from poor blood circulation

Long-term outlook

With early detection and proper treatment, many heart conditions can be managed well. People often live full, active lives with the right care. Your doctor will work with you to create a plan that gives you the best possible outcome. Remember, you are not alone – there is effective treatment and support available.

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