Cardiomyopathy

Overview

Cardiomyopathy is a group of diseases that affect the heart muscle. When the heart muscle becomes enlarged, thickened, stiff, or weakened, it may not pump blood as effectively as it should. This can lead to symptoms such as breathlessness, fatigue, swelling, or irregular heart rhythms. In some people, cardiomyopathy develops slowly and causes few or no symptoms at first. In others, it may be detected after symptoms appear or during tests for another heart concern.

There are several types of cardiomyopathy. Dilated cardiomyopathy occurs when the heart chambers become enlarged and the pumping action becomes weaker. Hypertrophic cardiomyopathy involves abnormal thickening of the heart muscle, which may affect blood flow. Restrictive cardiomyopathy occurs when the heart muscle becomes stiff and does not fill normally. Other forms may be related to specific conditions, pregnancy, toxins, infections, or inherited factors.

Cardiomyopathy is a serious condition, but many people can be monitored and treated to help manage symptoms, support heart function, and reduce the risk of complications. Care is usually provided by a cardiology team and may involve long-term follow-up.

Symptoms

Symptoms of cardiomyopathy can vary depending on the type, severity, and whether complications are present. Some people have no noticeable symptoms in the early stages.

• Shortness of breath during activity or when lying down
• Unusual tiredness or reduced ability to exercise
• Swelling in the ankles, feet, legs, or abdomen
• Palpitations, fluttering, or a fast heartbeat
• Chest discomfort or pressure
• Dizziness, lightheadedness, or fainting
• Persistent cough, especially when lying flat
• Unexplained weight gain due to fluid retention

Symptoms may develop gradually or appear suddenly. Worsening breathlessness, fainting, severe chest pain, or signs of fluid buildup should be assessed promptly by a healthcare professional.

Causes and Risk Factors

Cardiomyopathy can be caused by many different factors. In some cases, the cause is not identified. It may be inherited, meaning it can run in families due to genetic changes. In other cases, it may develop after another medical condition affects the heart muscle.

Possible causes and risk factors include:

• Family history of cardiomyopathy, sudden cardiac death, or certain rhythm disorders
• Long-term high blood pressure
• Coronary artery disease or previous heart attack
• Heart valve disease
• Viral or other infections affecting the heart muscle
• Certain metabolic or endocrine conditions
• Autoimmune or inflammatory diseases
• Exposure to alcohol, toxins, or some medical treatments that may affect the heart
• Pregnancy-related heart muscle changes in some individuals
• Nutritional deficiencies in specific circumstances

Because some forms are inherited, close relatives may sometimes be advised to have heart screening, especially if there is a family history of cardiomyopathy or unexplained sudden death.

Diagnosis

Diagnosis begins with a medical history, physical examination, and discussion of symptoms, family history, and previous health conditions. A cardiologist may listen for abnormal heart sounds, check for signs of fluid retention, and assess blood pressure and pulse.

Tests used to evaluate cardiomyopathy may include:

• Electrocardiogram, which records the heart’s electrical activity
• Echocardiogram, an ultrasound test that shows heart size, structure, and pumping function
• Blood tests to assess general health and possible contributing conditions
• Chest imaging to look for heart enlargement or fluid in the lungs
• Cardiac magnetic resonance imaging for detailed pictures of the heart muscle
• Exercise or stress testing in selected cases
• Heart rhythm monitoring over a period of time
• Genetic testing or family screening when an inherited condition is suspected
• Cardiac catheterization or other specialized tests if needed to assess blood vessels or pressures in the heart

The combination of symptoms, examination findings, and test results helps the medical team identify the type of cardiomyopathy and plan appropriate care.

Treatment Options

Treatment depends on the type of cardiomyopathy, symptoms, heart function, risk of rhythm problems, and any underlying cause. The goals are to reduce symptoms, support the heart’s workload, manage contributing conditions, and lower the risk of complications.

Treatment may include lifestyle guidance recommended by the medical team, such as appropriate physical activity, nutrition advice, limiting harmful substances, and monitoring fluid or salt intake when advised. People with cardiomyopathy may also be encouraged to keep regular follow-up appointments and report changes in symptoms.

Medicines may be prescribed to help the heart pump more effectively, control blood pressure, reduce fluid buildup, manage heart rhythm problems, or reduce the risk of blood clots. The exact choice of medication is individualized and should be discussed with a cardiologist.

Some patients may need implanted devices to help control dangerous heart rhythms or support coordinated heartbeats. In specific cases, procedures may be recommended to treat rhythm problems, relieve obstruction, repair or replace heart valves, or improve blood flow if coronary artery disease is present. For advanced heart failure that does not respond to other treatments, specialized options may be considered by a heart team.

Management is often long term. Regular monitoring helps doctors adjust treatment as the condition changes over time.

When to See a Doctor

Medical evaluation is important if you have unexplained shortness of breath, persistent fatigue, swelling in the legs or abdomen, palpitations, dizziness, fainting, or chest discomfort. People with a family history of cardiomyopathy, sudden cardiac death, or inherited heart disease should discuss screening with a healthcare professional.

Seek urgent medical care for severe chest pain, sudden or severe shortness of breath, fainting, a very fast or irregular heartbeat with weakness, or symptoms that rapidly worsen. Early assessment can help identify heart problems and guide appropriate treatment and follow-up.