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Severe muscle disease, or muscular dystrophy, refers to a group of more than 30 genetic conditions that cause progressive muscle weakness and degeneration of skeletal muscles. The symptoms of muscular dystrophy vary, but they generally get worse over time, leading to loss of strength, increasing disability, and possible deformity. The most common type is Duchenne muscular dystrophy, which usually affects young boys. Other types include Becker muscular dystrophy, myotonic dystrophy, and congenital muscular dystrophies. Treatment options include surgery, heart care, speech therapy, and respiratory care.
| Characteristics | Values |
|---|---|
| Definition | Muscular dystrophy refers to a group of more than 30 genetic conditions that affect muscle function. |
| Cause | Mutations in the genes responsible for healthy muscle structure and function. |
| Symptoms | Muscle weakness, loss of muscle mass, difficulty walking and running, frequent falls, trouble swallowing, breathing difficulties, bone thinning, scoliosis, cognitive and behavioural impairments. |
| Types | Becker muscular dystrophy, myotonic dystrophy, congenital muscular dystrophies, Duchenne muscular dystrophy, distal muscular dystrophy. |
| Treatment | Surgery, heart care, speech therapy, respiratory care, medications (e.g. eteplirsen, golodirsen). |
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What You'll Learn
- Muscular dystrophy is a group of more than 30 genetic conditions that cause muscle weakness and loss of mass over time
- Becker muscular dystrophy is the second most common type of muscular dystrophy, mainly affecting boys
- Myotonic dystrophy is the most common type of muscular dystrophy diagnosed in adulthood, affecting men and women equally
- Congenital muscular dystrophies refer to a group of muscular dystrophies apparent at or near birth, causing overall muscle weakness
- Treatments for muscular dystrophy include surgery, heart care, speech therapy, respiratory care, and medications
Muscular dystrophy is a group of more than 30 genetic conditions that cause muscle weakness and loss of mass over time
Muscular dystrophy (MD) is a group of more than 30 genetic conditions that cause muscle weakness and loss of mass over time. It is caused by changes or mutations in the genes responsible for producing healthy muscle structure and function. These mutations affect the cells that maintain muscles, leading to progressive muscle weakness and degeneration. MD can be inherited from one or both biological parents and can manifest at birth, during childhood, or adulthood.
There are several types of MD, including Becker muscular dystrophy (BMD), which is the second most common type and typically affects boys, though girls may exhibit milder symptoms. BMD symptoms can appear between ages 5 and 60 but usually start in the teenage years. Myotonic dystrophy, the most frequently diagnosed form in adults, affects both sexes equally, causing difficulty in muscle relaxation after use and potentially impacting the heart, lungs, and endocrine system. Congenital muscular dystrophies (CMD) are present at or near birth and cause overall muscle weakness, joint issues, spinal curvature, breathing problems, intellectual disabilities, and eye problems.
Duchenne muscular dystrophy (DMD) is the most common type, typically affecting young boys. It leads to challenges with movement, such as late walking, frequent falls, trouble using arms, and difficulty with running, jumping, or climbing stairs. DMD can also cause muscle pain, stiffness, learning difficulties, and delayed growth. Emery-Dreifuss muscular dystrophy (EDMD) primarily affects male children and young adults, causing muscle weakness in the shoulders, upper arms, and shins, and it can progress slowly. Facioscapulohumeral muscular dystrophy (FSHD) commonly affects muscles in the face, shoulders, and upper arms, often impacting one side of the body more than the other.
The symptoms of MD can be managed and the course of the disease slowed through medications and treatments such as surgery, heart care, speech therapy, and respiratory care. MD can lead to serious health complications, including trouble walking and using arms, swallowing disorders, and respiratory issues, requiring assistive devices for mobility and breathing.
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Becker muscular dystrophy is the second most common type of muscular dystrophy, mainly affecting boys
Becker muscular dystrophy (BMD) is the second most prevalent type of muscular dystrophy, primarily affecting boys. It is a rare, inherited condition that causes progressive muscle degeneration and weakness, with symptoms typically manifesting between the ages of 5 and 15 but sometimes appearing later. BMD is characterised by an X-linked recessive disorder involving a mutation in the dystrophin gene, which results in reduced or nonfunctional dystrophin production. Dystrophin is essential for stabilising muscle cells, and its deficiency leads to muscle weakness and damage over time.
The proximal lower limb muscles are predominantly affected by BMD, and symptoms include muscle pain, spasms, and difficulty walking, with mobility issues worsening over time. Cardiomyopathy, breathing problems, learning difficulties, and loss of balance and coordination are also common in people with BMD. While males are predominantly affected due to the X-linked inheritance pattern, females can be carriers and may experience milder symptoms such as cardiomyopathy or mild muscle weakness.
Currently, there is no cure for BMD, and treatment focuses on managing symptoms and optimising quality of life. Corticosteroids are used to improve lung function, delay scoliosis, and prolong survival. Rehabilitation, including physical therapy, speech therapy, and occupational therapy, helps prolong mobility and enhance daily functioning. Additionally, mobility aids, such as braces, canes, and wheelchairs, may be necessary.
BMD is considered less severe than Duchenne muscular dystrophy (DMD), with a later onset of symptoms. Patients with BMD may remain ambulatory even after the age of 16, whereas those with DMD become dependent on wheelchairs before the age of 13. However, heart failure is a frequent complication in individuals with BMD, and cardiac disease is a significant concern.
While BMD is rare, affecting about 3 to 6 out of every 100,000 births, early diagnosis and comprehensive care from a multidisciplinary team of healthcare professionals are crucial for managing the condition and improving clinical outcomes.
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Myotonic dystrophy is the most common type of muscular dystrophy diagnosed in adulthood, affecting men and women equally
Myotonic dystrophy is characterised by the muscles' inability to relax at will. For example, it might be hard to let go of someone's hand after shaking it. The facial and neck muscles are often the first to be affected. Symptoms often start between the ages of 20 and 30, but some people experience symptoms shortly after birth or in childhood. As the disease progresses, the heart may beat out of rhythm and the heart muscle can weaken. Heart rhythm issues can be the first complication for some people. Muscles involved in breathing can also weaken, leading to poor breathing, especially during sleep. Other names for myotonic dystrophy are Steinert's disease or dystrophia myotonica.
Myotonic dystrophy can also affect the heart and lungs and may cause endocrine issues, such as thyroid disease and diabetes. It is caused by dominant inheritance, meaning that the mutated gene needs to be inherited from only one biological parent for the condition to develop. This is in contrast to recessive inheritance, where the mutated gene must be inherited from both biological parents.
There are several treatment options available for people with muscular dystrophy, including surgery to relieve tension in contracted muscles or correct spine curvature (scoliosis). Early treatment with ACE inhibitors and/or beta-blockers may slow the progression of cardiomyopathy and prevent the onset of heart failure. Pacemakers can also help treat heart rhythm problems and heart failure. Speech therapy can aid those who have difficulty swallowing, and respiratory care, such as cough-assist devices and respirators, can help with breathing. In addition, medications such as eteplirsen and golodirsen have been developed to alter the course of certain forms of the disease.
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Congenital muscular dystrophies refer to a group of muscular dystrophies apparent at or near birth, causing overall muscle weakness
Congenital muscular dystrophy (CMD) is a group of rare muscular dystrophies that cause muscle weakness in infants. It refers to a group of muscular dystrophies that become apparent at or near birth, with "congenital" meaning "present from birth". CMD causes overall muscle weakness, with possible joint stiffness or looseness, and the severity of muscle weakness can vary.
CMD is caused by genetic mutations affecting some of the proteins necessary for muscles and sometimes for the eyes and/or brain. There are several subtypes of CMD, and healthcare providers diagnose the subtype according to the affected gene(s). Some of the most common subtypes include Laminin-alpha 2-related dystrophies (LAMA2) and Dystroglycanopathies (DGPs). Depending on the specific type of CMD, additional symptoms may include eye issues, drooping upper eyelid (ptosis), intellectual disability, seizures, and brain abnormalities.
The symptoms of CMD at birth or shortly thereafter can include poor muscle tone, minimal spontaneous movements of arms and legs, a weak cry, feeding difficulties, muscle and joint tightness, and significant gross motor skill delays in child development. As children with CMD grow older, they may experience further symptoms such as challenges with movement, frequent falls, trouble running, jumping or climbing stairs, and muscle pain and stiffness.
Treatment for CMD involves managing symptoms with various strategies, such as physical therapy, assistive devices, and medications.
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Treatments for muscular dystrophy include surgery, heart care, speech therapy, respiratory care, and medications
Muscular dystrophy refers to a group of over 30 genetic conditions that affect muscle function. It is caused by mutations in the genes responsible for maintaining healthy muscle structure and function, resulting in progressive muscle weakness. While there is no cure for muscular dystrophy, various treatments can help manage symptoms and improve quality of life. Here are some of the key treatments:
Surgery
In some cases, surgery may be required to relieve tension in contracted muscles or to correct spine curvature (scoliosis). Scoliosis, or curvature of the spine, can impact respiratory function by affecting the structure of the chest wall, making breathing more difficult over time.
Heart Care
Heart health is an important aspect of treating muscular dystrophy, as the condition can affect the heart muscle. Early treatment with ACE inhibitors and/or beta-blockers may slow the progression of cardiomyopathy (heart muscle disease) and prevent heart failure. Additionally, pacemakers can help treat heart rhythm problems. Cardiologists may use tools such as EKG (electrocardiogram) and echocardiogram to monitor heart health.
Speech Therapy
Speech therapy can benefit individuals with muscular dystrophy who experience difficulty with speech and swallowing due to weakened speech muscles or respiratory muscles. Techniques such as slowing the rate of speech, using pacing methods, or an alphabet board can improve speech intelligibility.
Respiratory Care
Respiratory care is crucial for individuals with muscular dystrophy, as illnesses affecting breathing muscles can become problematic. Vaccinations for pneumonia and influenza are recommended, along with good oral hygiene to prevent chest infections. Cough-assist devices, respirators, and, in severe cases, tracheostomy and assisted ventilation may be necessary to support breathing.
Medications
Medications such as corticosteroids can help improve muscle strength and slow down the progression of certain types of muscular dystrophy. However, long-term use may have side effects such as weight gain and weaker bones. Targeted medicines and gene therapies are also available for specific types of muscular dystrophy with confirmed gene changes. Additionally, heart medications like ACE inhibitors and beta-blockers are used to treat cardiomyopathy and improve heart function.
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Frequently asked questions
Severe muscle disease refers to a group of more than 30 genetic conditions that affect muscle function. It is also known as muscular dystrophy.
Symptoms of severe muscle disease include muscle weakness, muscle pain and stiffness, and progressive muscle degeneration. In many cases, the heart muscle is affected, which can lead to cardiac failure. Other symptoms include difficulty walking, running, jumping, or climbing stairs.
Treatment for severe muscle disease aims to manage symptoms and slow the course of the disease. This may include surgery to relieve tension in contracted muscles, medications such as ACE inhibitors and beta-blockers, speech therapy, and respiratory care.
