Overview
Cardiomyopathy (kahr-dee-o-my-OP-uh-thee) is a disease of the heart muscle that makes it harder for your heart to pump blood to the rest of your body. Cardiomyopathy can lead to heart failure.
The main types of cardiomyopathy include dilated, hypertrophic and restrictive cardiomyopathy. Treatment — which might include medications, surgically implanted devices or, in severe cases, a heart transplant — depends on which type of cardiomyopathy you have and how serious it is.
Symptoms
There might be no signs or symptoms in the early stages of cardiomyopathy. But as the condition advances, signs and symptoms usually appear, including:
- Breathlessness with exertion or even at rest
- Swelling of the legs, ankles and feet
- Bloating of the abdomen due to fluid buildup
- Cough while lying down
- Fatigue
- Heartbeats that feel rapid, pounding or fluttering
- Chest discomfort or pressure
- Dizziness, lightheadedness and fainting
Signs and symptoms tend to get worse unless treated. In some people, the condition worsens quickly; in others, it might not worsen for a long time.
When to see a doctor
See your doctor if you have one or more signs or symptoms associated with cardiomyopathy. Call 911 or your local emergency number if you have severe difficulty breathing, fainting or chest pain that lasts for more than a few minutes.
Because some types of cardiomyopathy can be hereditary, if you have it your doctor might advise that your family members be checked.
Causes
Often the cause of the cardiomyopathy is unknown. In some people, however, it’s the result of another condition (acquired) or passed on from a parent (inherited).
Contributing factors for acquired cardiomyopathy include:
- Long-term high blood pressure
- Heart tissue damage from a heart attack
- Chronic rapid heart rate
- Heart valve problems
- Metabolic disorders, such as obesity, thyroid disease or diabetes
- Nutritional deficiencies of essential vitamins or minerals, such as thiamin (vitamin B-1)
- Pregnancy complications
- Drinking too much alcohol over many years
- Use of cocaine, amphetamines or anabolic steroids
- Use of some chemotherapy drugs and radiation to treat cancer
- Certain infections, especially those that inflame the heart
- Iron buildup in your heart muscle (hemochromatosis)
- A condition that causes inflammation and can cause lumps of cells to grow in the heart and other organs (sarcoidosis)
- A disorder that causes the buildup of abnormal proteins (amyloidosis)
- Connective tissue disorders
- Infection with COVID-19
Types of cardiomyopathy include:
- Dilated cardiomyopathy. In this type of cardiomyopathy, the pumping ability of your heart’s main pumping chamber — the left ventricle — becomes enlarged (dilated) and can’t effectively pump blood out of the heart.Although this type can affect people of all ages, it occurs most often in middle-aged people and is more likely to affect men. The most common cause is coronary artery disease or heart attack.
- Hypertrophic cardiomyopathy. This type involves abnormal thickening of your heart muscle, particularly affecting the muscle of your heart’s main pumping chamber (left ventricle). The thickened heart muscle can make it harder for the heart to work properly.Hypertrophic cardiomyopathy can develop at any age, but the condition tends to be more severe if it becomes apparent during childhood. Most affected people have a family history of the disease, and some genetic mutations have been linked to hypertrophic cardiomyopathy.
- Restrictive cardiomyopathy. In this type, the heart muscle becomes rigid and less elastic, so it can’t expand and fill with blood between heartbeats. This least common type of cardiomyopathy can occur at any age, but it most often affects older people.Restrictive cardiomyopathy can occur for no known reason (idiopathic), or it can by caused by a disease elsewhere in the body that affects the heart, such as when iron builds up in the heart muscle (hemochromatosis).
- Arrhythmogenic right ventricular dysplasia. In this rare type of cardiomyopathy, the muscle in the lower right heart chamber (right ventricle) is replaced by scar tissue, which can lead to heart rhythm problems. It’s often caused by genetic mutations.
- Unclassified cardiomyopathy. Other types of cardiomyopathy fall into this category.