Logan Steele
Muscle diseases are conditions that affect the human muscle system, and they can be classified as primary or secondary. Primary muscle diseases are caused by abnormalities in the muscles themselves, while secondary diseases are triggered by another condition. One example of a muscle disease is muscular dystrophy, which is a group of inherited diseases that cause weakness and wasting away of muscle tissue. Another example is myositis, an inflammation of muscles and their associated tissues, including blood vessels. In rare cases, excessive exercise without rest can lead to rhabdomyolysis, a life-threatening condition where muscles break down and release toxic components into the circulatory system.
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What You'll Learn
Muscular dystrophy
The main sign of muscular dystrophy is progressive muscle weakness. Specific signs and symptoms vary depending on the type of muscular dystrophy and begin at different ages and in different muscle groups. Some people may eventually require the use of a wheelchair or breathing assistance devices (ventilators). Other signs and symptoms include:
- Trouble using arms
- Shortening of muscles or tendons around joints (contractures)
- Curved spine (scoliosis)
- Heart problems
- Swallowing problems
- Drooping eyelids
- Difficulty lifting the front part of the foot
There is currently no cure for muscular dystrophy. However, medications and therapy can help manage symptoms and slow the course of the disease. Treatment options include medications, physical and occupational therapy, and surgical and other procedures. Corticosteroids, such as prednisone and deflazacort, can help improve muscle strength and delay the progression of certain types of muscular dystrophy. Newer drugs, such as eteplirsen and golodirsen, have been approved by the FDA to treat specific types of muscular dystrophy. Heart medications, such as angiotensin-converting enzyme (ACE) inhibitors or beta-blockers, may also be used if muscular dystrophy damages the heart.
People with muscular dystrophy should be monitored throughout their lives by a team of medical specialists, including neurologists, physical medicine and rehabilitation specialists, physical and occupational therapists, and other specialists depending on the individual's needs.
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Myopathies
There are several types of myopathies, including:
- Congenital myopathies: These are present from birth and can cause developmental delays in motor skills. They often affect all skeletal muscles and may not progress. Examples include nemaline myopathy, multi/minicore myopathy, and centronuclear myopathy.
- Mitochondrial myopathies: These are caused by mutations in the mitochondria, which are responsible for energy production in cells. They can cause muscle weakness and also affect the heart, brain, or gastrointestinal tract.
- Muscular dystrophies: This is a subgroup of myopathies characterised by progressive muscle degeneration and weakness. Duchenne muscular dystrophy is the most common form, usually affecting young boys.
- Metabolic myopathies: These myopathies affect the production of ATP within muscle cells and typically present with exercise-induced symptoms. They are caused by defects in the genes that code for certain enzymes.
- Inflammatory myopathies: These are caused by problems with the immune system attacking components of the muscle, leading to inflammation. They are more common in middle-aged women than men.
- Toxic myopathies: These are caused by toxins, such as alcohol, and certain medications.
- Endocrine myopathies: These myopathies are caused by issues with the endocrine system, which controls hormone production. They can be triggered by thyroid or adrenal diseases.
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Myositis
In summary, myositis is a rare and potentially serious disease that causes muscle inflammation and weakness. It is often challenging to diagnose and currently lacks a cure. However, with proper treatment, the symptoms can be managed, and the progression of the disease can be slowed.
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Rhabdomyolysis
The symptoms of rhabdomyolysis include muscle pain, weakness, stiffness, swelling, cramping, and dark urine. These symptoms may not be specific and can mimic other conditions like dehydration and heat cramps. Therefore, blood tests for creatine kinase (CK) levels and urine tests for myoglobin are used to confirm a diagnosis of rhabdomyolysis. Early diagnosis and treatment are crucial for a full recovery and to prevent permanent health effects.
Treatment options for rhabdomyolysis include intravenous (IV) fluid administration, medications, and home remedies. Recovery may take several weeks to months, and physical therapy may be beneficial for strengthening muscles. Complications of rhabdomyolysis can include very high levels of potassium in the blood (hyperkalemia) and compartment syndrome, which is a serious compression of nerves, blood vessels, and muscles that can cause tissue damage and blood flow problems.
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Muscle atrophy
The symptoms of muscle atrophy vary depending on the cause and severity of muscle loss. The predominant symptom is increased muscle weakness, which may result in difficulty or inability to perform physical tasks. For example, atrophy of the core or leg muscles may cause difficulty standing from a seated position or walking, while atrophy of the throat muscles may cause difficulty swallowing. Treatment for muscle atrophy depends on the underlying cause and may include exercise, physical therapy, ultrasound therapy, surgery, and adequate nutrition.
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Frequently asked questions
Muscular dystrophy is a group of inherited diseases that cause progressive weakness and loss of muscle mass. It occurs when certain genes involved in making proteins that protect muscle fibres are defective. There is no cure for muscular dystrophy, but medications and therapy can help manage symptoms and slow the course of the disease.
Rhabdomyolysis is a rare muscle injury that causes muscles to break down and can lead to muscle death. It can be caused by certain medications, substance use, long periods of inactivity, or underlying medical conditions such as genetic or metabolic disorders.
Muscle atrophy is a loss of muscle mass that can occur due to various factors, including malnutrition, age, lack of physical activity, or certain medical conditions. It can be treated through regular exercise, improved nutrition, and in some cases, physical therapy or electrical stimulation.
Myositis is an inflammation of muscles and their associated tissues, including blood vessels. Polymyositis (PM) is a rare type of myositis that affects people over 20, mostly females. It is marked by muscle inflammation and weakness, and while there is no cure, it is treatable.
