17427 Restrictive Cardiomyopathy

Overview

Restrictive cardiomyopathy is a rare disease of the heart muscle. The muscle becomes stiff and less flexible, so the heart has trouble relaxing and filling with blood. This means less oxygen-rich blood can be pumped to the body. Over time, this can lead to symptoms like breathlessness, tiredness, and swelling.

No, restrictive cardiomyopathy is uncommon. It is much rarer than other types of cardiomyopathy, such as dilated or hypertrophic cardiomyopathy.

It can affect both children and adults. Some cases are inherited (run in families). It may also be linked to other health conditions, such as amyloidosis, sarcoidosis, or certain storage diseases.

Symptoms

Common symptoms

• Shortness of breath, especially during activity or when lying down
• Fatigue and feeling unusually weak
• Swelling in the legs, ankles, or feet
• Feeling your heart racing or fluttering (palpitations)
• Chest pain or pressure
• Dizziness or lightheadedness

Symptoms in children

• Poor weight gain or trouble growing
• Difficulty feeding or getting tired while eating
• Pale skin or cold hands and feet
• A swollen belly from fluid buildup

Symptoms in older adults

• More noticeable swelling in the legs and ankles
• Breathlessness during light activity
• Feeling unusually tired most of the time
• Fainting or feeling about to faint

Causes

Main causes

• Infiltrative diseases, where abnormal proteins or substances build up in the heart muscle, such as amyloidosis or haemochromatosis (iron overload)
• Sarcoidosis, an inflammatory condition that can affect the heart
• Certain genetic storage diseases that cause substances to collect inside heart cells
• Radiation therapy to the chest for cancer treatment
• In many cases, the cause is not known (this is called idiopathic)

Risk factors

• Having a close family member with cardiomyopathy
• A history of certain conditions like amyloidosis, sarcoidosis, or iron overload
• Past radiation treatment to the chest
• Receiving certain chemotherapy medicines
• Connective tissue disorders, such as scleroderma

When to see a doctor

See a doctor urgently if:

• If you have chest pain, severe breathlessness, or fainting, call your local emergency number immediately.

Book a routine appointment if:

• If you have ongoing tiredness, swelling, or breathlessness, see your healthcare provider and ask for a heart check.
• If you have a family history of cardiomyopathy, talk to your doctor about whether you need screening.

Diagnosis

Your doctor will start by asking about your symptoms, medical history, and family history. They will also examine you, such as listening to your heart and checking for swelling. If they think it might be a heart condition, they will usually refer you to a cardiologist (heart specialist) for more tests.

Tests that may be done

• Echocardiogram (an ultrasound scan of the heart) to look at how the heart muscle walls move and how the heart fills with blood
• Electrocardiogram (ECG) to check the heart's electrical activity and rhythm
• Chest X-ray to see the size and shape of your heart and any fluid in the lungs
• Cardiac MRI, which gives detailed pictures of the heart muscle and can show signs of buildup
• Blood tests to look for conditions that may cause restrictive cardiomyopathy
• A heart biopsy (a small sample of heart muscle taken for testing) in some cases

What to expect at your appointment

Getting a diagnosis takes time and may involve several visits to a specialist centre. You may need to have more than one test. This is normal. The results help your team understand exactly what is happening so they can plan the best care for you.

Treatment

Treatment for restrictive cardiomyopathy focuses on relieving symptoms, slowing down the condition, and treating any underlying cause if it is known. There is no cure yet, but there are many options to help you feel better and protect your heart.

Self-care at home

• Take your medicines exactly as your doctor tells you.
• Weigh yourself each day, and report a sudden gain of more than 2 to 3 pounds (about 1 to 1.5 kilograms) in a few days.
• Cut down on salt in your meals to help reduce fluid retention.
• Do not smoke and avoid secondhand smoke.
• Talk to your doctor before taking any new medicines, vitamins, or herbal products.

Medical treatments

Depending on your needs, your doctor may offer medicines to help the heart relax, remove extra fluid from the body, control heart rhythm, or reduce blood pressure. If there is an underlying condition like amyloidosis or sarcoidosis, treating that condition is also part of the plan. Your heart team will explain the options and why they are recommended. You should never start or stop a heart medicine without talking to them first.

When is surgery considered?

For some people, a small device like a pacemaker may be needed to help the heartbeat stay regular. If the heart becomes very weak and medicines are no longer enough, a heart transplant might be considered. This is a serious operation, but for carefully selected patients it can offer a much better quality of life.

Living with this condition

Living with restrictive cardiomyopathy means working closely with your heart team and making small adjustments to your routine. Pace yourself, rest when you need to, and ask for help if tasks feel too tiring. Keeping a symptom diary can help you and your doctor spot changes early.

Lifestyle tips

• Keep physically active at a level that feels comfortable. Ask your heart team what type and amount of exercise is safe for you.
• Find ways to manage stress, such as deep breathing, gentle walking, or spending time with people you trust.
• Sleep with your head supported and raise your legs when sitting to help with swelling.
• Avoid heavy lifting, intense exertion, or extremely hot or cold environments.

Diet and exercise

Eat a heart-friendly diet with plenty of fruits, vegetables, whole grains, and lean proteins. Keep sodium (salt) low, because salt makes your body hold on to water. A registered dietitian can help you tailor your diet to your needs. For exercise, gentle activities such as walking, cycling, or swimming are often good choices, but always check with your heart team first and stop if you feel unwell.

Mental health and emotional wellbeing

Living with a heart condition can bring worry, low mood, or stress. It is normal and nothing to be ashamed of. Speak openly with your doctor or a nurse about how you feel. Many people benefit from counselling, support groups, or talking with friends and family. If you ever have thoughts of harming yourself, this is a medical emergency — reach out to your local crisis line or emergency service right away.

Prevention

Restrictive cardiomyopathy is often caused by a genetic or underlying medical condition, so it cannot always be prevented. However, you can reduce the strain on your heart by managing other health conditions, keeping up with appointments, eating well, staying active, and avoiding smoking.

Vaccines

It is a good idea to stay up to date with recommended vaccinations, such as flu, pneumococcal, and COVID-19 vaccines. These help protect you from infections that could put extra stress on your heart.

Screening programmes

If you have a first-degree relative (parent, sibling, or child) with a cardiomyopathy, your doctor may recommend a heart check such as an ECG or an ultrasound. Screening can sometimes find problems before symptoms develop.

Complications

If left untreated

• Heart failure, where the heart cannot pump enough blood to meet the body's needs
• Blood clots inside the heart, which may travel to the brain and cause a stroke
• Irregular heart rhythms (arrhythmias)
• Fluid buildup in the lungs (pulmonary oedema)
• Damage to other organs, such as the kidneys or liver, from poor circulation

Long-term outlook

A diagnosis of restrictive cardiomyopathy is serious, but there is reason for hope. Treatment can help control symptoms, slow the disease, and improve quality of life. How well someone does depends on the cause and how early it is found. New treatments are being developed all the time, and your healthcare team will support you at every stage.

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