Learn About Duchenne Muscular Dystrophy Heart Complications

Duchenne muscular dystrophy is a genetic condition that primarily affects muscles, but it can also involve the heart. As the condition progresses, changes in the heart muscle may lead to cardiomyopathy, abnormal heart rhythms, or reduced cardiac function. Regular cardiac evaluation is therefore an important part of ongoing care for people with Duchenne muscular dystrophy.

Duchenne muscular dystrophy (DMD) is a genetic disorder associated with progressive muscle weakness caused by changes in the dystrophin gene. Although skeletal muscles are most visibly affected, dystrophin deficiency can also affect cardiac muscle. Heart involvement may develop gradually and sometimes without obvious symptoms in the early stages. For this reason, cardiac monitoring is an important component of comprehensive DMD care.

Heart Complications Associated With Duchenne Muscular Dystrophy

The heart can become affected as DMD progresses because cardiac muscle cells also require dystrophin for normal structure and function. Damage to these cells may contribute to changes in the heart muscle and its ability to pump blood efficiently.

Common cardiac complications may include:

• Dilated cardiomyopathy: The heart muscle may become enlarged and weakened, reducing its ability to pump blood effectively.
• Heart failure: Progressive weakening of cardiac muscle can eventually interfere with the heart's ability to meet the body's circulation needs.
• Abnormal heart rhythms: Changes in cardiac tissue may increase the possibility of arrhythmias.
• Fibrosis: Scar-like changes can develop within the heart muscle and may affect its function or electrical activity.
• Reduced cardiac function: Changes in the heart may occur before noticeable symptoms develop.

Some individuals may not experience clear warning signs despite developing cardiac abnormalities. Symptoms such as tiredness, shortness of breath, swelling, or changes in exercise tolerance can have several possible causes and should be evaluated by a healthcare professional.

Cardiac Monitoring and Management

Because heart complications can develop gradually, regular cardiac assessments are generally recommended for people with DMD. The specific frequency and type of testing depend on age, clinical findings, previous results, and individual circumstances.

Cardiac evaluation may involve:

• Echocardiography: This imaging test evaluates the structure and pumping function of the heart.
• Electrocardiography: An ECG records the heart's electrical activity and can identify certain rhythm or conduction abnormalities.
• Cardiac magnetic resonance imaging: Cardiac MRI can provide detailed information about heart structure, function, and areas of fibrosis.
• Clinical assessment: Healthcare professionals may review symptoms, medical history, blood pressure, and other relevant findings.
• Medication management: Depending on cardiac findings, doctors may prescribe medicines intended to support heart function or manage specific abnormalities.

Early identification of cardiac changes allows healthcare professionals to evaluate appropriate management strategies. Care is often coordinated among neuromuscular specialists, cardiologists, and other healthcare professionals familiar with DMD.

For individuals living with DMD, maintaining scheduled cardiac evaluations is important even when there are no noticeable heart symptoms. Families should discuss any new symptoms or significant changes in physical function with the treating healthcare team.

Duchenne muscular dystrophy can affect the heart as well as skeletal muscles, making cardiovascular monitoring an important part of long-term care. Cardiomyopathy, fibrosis, reduced cardiac function, and abnormal heart rhythms are among the complications that may occur. Regular assessments can help healthcare professionals identify cardiac changes and determine appropriate management. Because heart involvement can progress without obvious symptoms, ongoing evaluation remains important throughout the course of DMD. Information about cardiac complications should be discussed with qualified healthcare professionals who can provide guidance based on an individual's medical history and test results.