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Muscle disorders are conditions that cause muscle weakness, pain, or even paralysis. They can be caused by direct abnormalities in the muscles, such as polymyositis, or be secondary to another condition, such as endocrine issues. Muscle disorders can also be inherited, like muscular dystrophy, which causes muscle weakness and the wasting away of muscle tissue. Symptoms of muscular dystrophy include swallowing problems, large calf muscles, muscle pain and stiffness, and breathing issues. There is currently no cure for muscle disorders, but treatments like physical therapy, occupational therapy, and medicines such as corticosteroids and immunosuppressants can help manage the condition and improve everyday functioning.
| Characteristics | Values |
|---|---|
| Definition | Muscle disorders are diseases or disorders that are a result of direct abnormalities of the muscles. |
| Types | Primary (e.g. Polymyositis) and Secondary (e.g. diseases due to endocrine issues). |
| Symptoms | Muscle weakness, pain, paralysis, swallowing problems, breathing issues, and loss of muscle mass and strength. |
| Causes | Genetic changes, inherited from parents. |
| Diagnosis | Blood tests, muscle biopsy, enzyme tests, genetic analysis, muscle ultrasound, electromyography, physical exam. |
| Treatment | Corticosteroids, immunosuppressants, physical therapy, occupational therapy, medicines, gene therapies. |
| Prevention | N/A |
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What You'll Learn
Muscular dystrophy
Muscle disorders can cause weakness, pain, or even paralysis. Muscular dystrophy is a group of diseases that cause muscles to become weaker and lose mass over time. The condition is caused by changes in the genes responsible for making proteins necessary for forming healthy muscles. There are over 30 types of muscular dystrophy, with symptoms ranging from muscle weakness to swallowing difficulties, and breathing problems. The symptoms of the most common type start in childhood, mostly affecting boys. However, other types may not manifest until adulthood.
Duchenne muscular dystrophy (DMD) is the most prevalent form, impacting boys primarily but also affecting girls with milder symptoms. It can affect the heart and lungs as it progresses. Becker muscular dystrophy (BMD) is the second most common type, usually impacting boys, but girls can experience milder symptoms as well. Symptoms typically emerge during teenage years but can appear anytime between 5 and 60 years of age.
Emery-Dreifuss muscular dystrophy (EDMD) primarily affects male children and young adults, causing muscle weakness in the shoulders, upper arms, and shins. It can also impact the heart and tends to progress slowly. Facioscapulohumeral muscular dystrophy (FSHD) affects the muscles in the face, shoulders, and upper arms. Limb-girdle muscular dystrophy (LGMD) affects the muscles in the upper arms, upper legs, shoulders, and hips and can affect people of all ages. Oculopharyngeal muscular dystrophy (OPMD) weakens the muscles in the eyelids and throat, causing droopy eyelids and swallowing difficulties.
Myotonic dystrophy is the most common type diagnosed in adulthood, affecting men and women equally. People with this type have difficulty relaxing their muscles after use, and it can also impact the heart, lungs, and endocrine system. Congenital muscular dystrophies (CMD) refer to a group of muscular dystrophies present at or near birth, causing overall muscle weakness and possible joint stiffness or looseness. Distal muscular dystrophy affects the hands, feet, lower arms, and lower legs.
Medications and treatments are available to manage symptoms and slow the progression of muscular dystrophy. The Muscular Dystrophy Association (MDA) is a voluntary health organization dedicated to empowering individuals with muscular dystrophy to live longer and more independent lives.
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Muscle weakness
Muscular dystrophy is a group of diseases that cause progressive muscle weakness and the wasting away of muscle tissue over time. It is caused by genetic changes affecting the proteins needed for healthy muscles. Duchenne muscular dystrophy, which primarily affects boys, can cause delayed walking, frequent falls, and learning or behavioural challenges in addition to muscle weakness. Becker muscular dystrophy, a milder form, typically presents in teens or early adulthood with similar but less severe symptoms.
While short-term muscle weakness may be caused by something as simple as a tough workout, persistent muscle weakness without an apparent cause could indicate an underlying health issue. Those experiencing muscle weakness are advised to consult a healthcare provider, who can determine the underlying cause and recommend appropriate treatment. Treatment options may include physical therapy, occupational therapy, or medication, depending on the specific cause and severity of symptoms. Strength training and protective gear can help prevent muscle weakness by reducing the risk of nerve and spinal injuries.
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Diagnosis and treatment
Muscle disorders can cause weakness, pain, or even paralysis. They can be inherited or acquired later in life. Some common types of muscle disorders include muscular dystrophy, myopathy, MG (myasthenia gravis), and ALS (amyotrophic lateral sclerosis).
The diagnosis of muscle disorders typically involves identifying the specific type of muscle disorder and understanding the underlying causes. One common diagnostic tool is electromyography (EMG), which measures electrical activity in the muscles to detect neuromuscular abnormalities. A nerve conduction velocity test may be done in conjunction with EMG to determine whether the issue stems from a muscle disease or a nerve disorder. Additionally, blood tests can be used to measure antibodies and muscle enzymes, which can provide further insights into the disorder.
The treatment of muscle disorders varies depending on the specific type of disorder and its symptoms. While some muscle disorders have no cure, various treatments can help manage symptoms and slow the progression of the disease. For example, in cases of myopathy, management focuses on symptom control and therapy. Specific medications can treat Duchenne muscular dystrophy and Pompe disease. Acquired myopathies, such as endocrine, toxic, and infectious myopathies, are often treated by addressing the underlying disease causing the myopathy. Toxin-related myopathies require discontinuing the offending agent or medication. Muscle symptoms resulting from bacterial or viral infections can be treated with antibiotics.
In the case of muscular dystrophy, medicines and other treatments can help manage symptoms and slow the progression of the disease. However, it is important to note that the specific treatment depends on the type of muscular dystrophy and the affected muscle groups. For instance, swallowing problems associated with muscular dystrophy can lead to nutritional deficiencies and an increased risk of lung infection (aspiration pneumonia). In such cases, a feeding tube may be necessary to ensure adequate nutrition and reduce the risk of aspiration. Additionally, children with certain types of muscular dystrophy may experience learning, intellectual, or mental health challenges. Addressing these issues may involve accommodations in the educational setting.
MG (myasthenia gravis), a chronic autoimmune neuromuscular disorder, currently has no cure. However, treatment can control immune system activity and limit the progression of the disease. Early intervention is crucial for managing MG. Similarly, ALS (amyotrophic lateral sclerosis) also lacks a cure, but treatments can help manage symptoms and prevent complications.
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Swallowing problems
Muscle disorders can cause weakness, pain, or even paralysis. Muscular dystrophy, for example, causes weakness and the wasting away of muscle tissue. It is a group of diseases that cause muscles to become weaker and lose mass over time. The condition is inherited from parents and each type involves the eventual loss of strength. The symptoms of the most common type of muscular dystrophy start in childhood, mostly in boys.
Oral dysphagia occurs when the problem is in the mouth, usually due to the movement of the tongue. Oropharyngeal dysphagia occurs when the problem is in the throat, specifically regarding food passing through. Esophageal dysphagia occurs when food is unable to move down through the oesophagus.
Dysphagia can also be caused by other conditions, such as cerebral palsy, dementia, multiple sclerosis, and Parkinson's disease. Achalasia, a rare disorder where muscles at the bottom of the oesophagus do not relax to allow food to enter the stomach, can also cause dysphagia. Cricopharyngeal spasms, or abnormal contractions that create the sensation of something being stuck in the throat, can also cause dysphagia.
If the muscles involved with swallowing are affected, it can lead to trouble getting enough nutrition. It also raises the risk of a lung infection caused by breathing food or liquid into the airways, known as aspiration pneumonia. To lower these risks, nutrition may need to be given through a feeding tube.
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Testing for disorders
Testing for muscle disorders typically involves a combination of physical examinations, neurological exams, and medical history reviews. Doctors will often ask patients about their symptoms, medical history, and family history to determine if the muscle symptoms are caused by a disease affecting other organs or an inherited condition. They may also review medications and perform blood and urine tests to rule out muscle weakness caused by toxins or medications.
One common diagnostic test for muscle disorders is electromyography (EMG), which measures electrical activity in the muscles to identify neuromuscular abnormalities. During an EMG test, a thin needle electrode is inserted into the skin and muscle tissue, and the patient is asked to contract and relax the muscles. The electrode detects electrical activity, helping to evaluate muscle health and function. Nerve conduction tests, including nerve conduction velocity tests, may also be performed alongside EMGs to evaluate the function of peripheral nerves and determine the cause of symptoms.
Muscle disorders can also be identified through imaging techniques such as musculoskeletal MRI scans, which provide detailed images of the muscles and surrounding structures. In some cases, needle biopsies may be performed to extract a small sample of muscle tissue for laboratory analysis. Blood tests, including creatine kinase blood tests, can be used to detect elevated levels of muscle enzymes that may indicate muscle damage or specific disorders. Genetic testing and counselling are often recommended for individuals suspected of having muscular dystrophy or other genetic muscle disorders.
It is important to note that the specific tests performed may vary depending on the suspected disorder, the patient's symptoms, and the healthcare provider's recommendations. Early diagnosis and treatment are crucial for managing muscle disorders and preventing further complications.
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Frequently asked questions
Muscle disorders are diseases or disorders that are a result of direct abnormalities in the muscles. They can cause weakness, pain, or even paralysis.
There are primary muscle diseases that are a result of direct abnormalities of the muscles, such as Polymyositis. There are also secondary muscle disorders that are caused by another condition and may have caused muscle damage, such as endocrine issues. Some specific examples of muscle disorders include Duchenne muscular dystrophy, Becker muscular dystrophy, and sarcopenia.
Symptoms vary depending on the type of muscle disorder. Some general symptoms include muscle weakness, swallowing problems, breathing issues, and muscle pain and stiffness.
Muscle disorders can be diagnosed through various tests such as blood tests, muscle biopsies, genetic analyses, and muscle ultrasounds. There is currently no cure for muscle disorders, but treatments like medicines, physical therapy, and occupational therapy can help manage the condition and improve everyday functioning.
