What is the main difference between Duchenne muscular dystrophy and Becker muscular dystrophy?

Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD) are both genetic disorders that cause progressive muscle weakness, stemming from mutations in the same gene responsible for producing dystrophin, a vital protein for muscle health and function. However, there are key differences between them regarding disease severity, age of symptom onset, and the rate of progression.

Key Differences in Severity and Progression

Duchenne muscular dystrophy is considered the most common and severe form of muscular dystrophy in childhood. Symptoms usually begin between the ages of 3 and 6, characterized by muscle weakness that worsens rapidly, significantly affecting the ability to walk and perform daily activities. Children with Duchenne often lose the ability to walk at a relatively early age [1].

In contrast, Becker muscular dystrophy is less severe than Duchenne and progresses more slowly. Symptoms typically appear in the teenage years and may be delayed until age 25. Many individuals with Becker maintain the ability to walk until their mid-thirties or beyond, while others may lose it during their teenage years [2].

Impact on Other Organs

Both types can affect organs other than skeletal muscles. In Duchenne muscular dystrophy, heart problems (cardiomyopathy) and respiratory issues are more common and severe. Some children may also experience cognitive and behavioral impairment. With advances in healthcare, the quality of life for those with Duchenne has improved, with many now living into their twenties or thirties [2].

In Becker muscular dystrophy, heart, cognitive, and behavioral issues are less common or less severe compared to Duchenne, though they can still occur [2]. Individuals with Becker typically live into mid-adulthood or longer [2].

Importance of Diagnosis and Care

Because both diseases are genetic and cause progressive muscle weakness, early diagnosis is crucial. Diagnosis is typically made through medical and family history, physical examination, blood tests (including genetic testing and specific enzyme tests such as creatine kinase), muscle biopsies, and electromyography (EMG) [1].

Although there is no cure for either type, treatment focuses on managing symptoms and preventing complications. This typically includes a combination of therapies such as physical therapy, occupational therapy, respiratory care, and medications that may help slow muscle damage or reduce symptoms [1]. You can learn more about support options and treatments available for Duchenne muscular dystrophy and its types by visiting Duchenne Muscular Dystrophy and Its Types: Understanding Progression, Support, and Available Treatments (Arabic).

When to Seek Emergency Medical Assistance?

If you notice any signs indicating severe difficulty breathing, such as severe shortness of breath, a change in lip or skin color to blue (cyanosis), or loss of consciousness, you must seek emergency care immediately. These symptoms may indicate respiratory failure, which requires urgent medical intervention [2].

It is important to follow the treatment plan recommended by the healthcare team regularly, as symptoms and disease progression can vary individually, even within the same type of muscular dystrophy [1].

Medical references

• Muscular Dystrophy
• Muscular Dystrophy