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Polymyositis is a rare disease that causes muscles to become irritated and inflamed and can affect muscles all over the body. The exact cause of polymyositis is unknown, but it is thought to be an autoimmune disorder, possibly triggered by a viral infection of muscle tissue. The disease is more common in women than in men and tends to develop between the ages of 50 to 70 years, although anyone of any age or sex can be affected. The main symptom of polymyositis is muscle weakness, which can interfere with common tasks such as walking, climbing stairs, or reaching over the head. Other symptoms include muscle pain, fatigue, swallowing difficulties, and breathing problems. So, does polymyositis cause muscle twitching?
| Characteristics | Values |
|---|---|
| Cause | Unknown, but likely an autoimmune disorder triggered by a viral infection of muscle tissue |
| Age | More common in people aged 31-60-70, rarely occurs in those under 18 |
| Gender | More common in women |
| Symptoms | Muscle weakness, pain, fatigue, fever, stiffness, rash, difficulty swallowing, breathing, talking, walking, climbing stairs, standing up, lifting objects, etc. |
| Diagnosis | Blood tests, electromyography, muscle biopsy, MRI scans |
| Treatment | Corticosteroids, immunosuppressive drugs, physical therapy, occupational therapy, pulmonary medicine, cardiology, dietary management, speech/swallowing therapy |
| Prognosis | Hard to predict, some recover, most respond to treatment, others experience complications or death |
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What You'll Learn
Polymyositis is an autoimmune disorder
Polymyositis is a rare disease that causes muscles to become irritated and inflamed. The muscles eventually start to break down and become weak. The condition can affect muscles all over the body, making even simple movements hard to do. It is a type of inflammatory myopathy, which irritates the muscles that help us move. It also damages nearby tissues, such as blood vessels that supply oxygen and nutrients to the muscles. Polymyositis is an autoimmune disorder, where the immune system attacks the body's own tissues.
The exact cause of polymyositis is not known, but it is likely to be an autoimmune disorder, where the immune cells mistakenly attack the body's muscle fibres. It is also more common among people with HIV or AIDS. Polymyositis is characterised by the overproduction of particular antibodies, which can be identified through blood tests. The disease is more common in women than in men and tends to develop between the ages of 30 to 70, although it can occur in people of any age or sex. It is thought that polymyositis may be triggered by a viral infection or an allergic reaction to certain medications.
The symptoms of polymyositis include profound muscular weakness, pain, fatigue, fever, and trouble swallowing and breathing. As the muscles become weaker, patients may fall often and face limitations in their daily activities. In its later stages, polymyositis can lead to abnormal muscle shortening (contracture). The condition cannot be cured, but there are treatments that can help manage symptoms such as corticosteroids and immunosuppressive drugs.
Polymyositis can be difficult to diagnose and is sometimes mistaken for muscular dystrophy. Diagnosis typically involves a physical examination and various tests, including blood tests, electromyography, muscle biopsy, and scans such as MRI. The outlook for polymyositis varies, with some people recovering, most responding to treatment, and others facing severe complications or even death.
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It causes muscle weakness
Polymyositis is a disease that causes muscles to become irritated and inflamed. The muscles eventually start to break down and become weak. The condition can affect muscles all over the body, making even simple movements hard to do. It can affect the ability to run, walk, or lift objects.
Polymyositis causes profound muscular weakness in affected body parts. By the time the person experiences symptoms, they have already lost around half of their muscle fibres to the disease. They may be unable to lift their arms above shoulder height or lift their head off a pillow. As inflammation gets worse around the body, pain and weakness may affect the ankles, wrists, and lower arm area.
If the muscles in the digestive tract and chest wall are affected, polymyositis may cause problems with breathing and swallowing. This can lead to respiratory failure, malnutrition, and weight loss. People living with polymyositis may experience difficulties with breathing or swallowing if the associated muscles weaken too severely.
Polymyositis can also cause voice changes if the muscles of the larynx are affected. Peristalsis (the muscular contractions of the bowel) may falter, leading to constipation. In its later stages, the disease may cause the abnormal shortening of muscles (contracture).
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It can affect swallowing and breathing
Polymyositis is a disease that causes muscles to become irritated and inflamed. The muscles eventually break down and become weak, making even simple movements difficult. The condition can affect muscles all over the body, including those involved in swallowing and breathing.
As polymyositis progresses, the muscles in the throat and chest that control swallowing and breathing can become severely weak, leading to life-threatening complications. Respiratory failure is a rare but possible outcome of untreated polymyositis. This occurs when the diaphragm and chest wall muscles are affected, resulting in breathing difficulties and potentially requiring supplemental oxygen or ventilation support.
Difficulty swallowing, or dysphagia, is a common symptom of polymyositis. The oesophagus may be affected, leading to regurgitation of food and a risk of aspiration. Weight loss and malnutrition can result from polymyositis-related swallowing issues, as eating becomes challenging.
The impact of polymyositis on swallowing and breathing can vary. Some individuals may experience mild to moderate symptoms, while others may face more severe complications. The condition can lead to an inability to swallow or breathe without assistance, requiring emergency medical attention.
While there is no cure for polymyositis, symptoms can be managed through treatment plans that reduce the impact on daily life. Healthcare providers can help identify warning signs and adjust treatments accordingly to prevent dangerous complications. It is crucial to seek medical advice if experiencing new or worsening symptoms related to swallowing or breathing difficulties.
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There is no cure, but symptoms can be managed
Polymyositis is a rare disease that causes muscles to become irritated and inflamed. The muscles eventually start to break down and become weak, making even simple movements hard to do. The condition can affect muscles all over the body. It can make it hard to do everyday things like walking up a flight of stairs, lifting arms, or getting out of a chair. It can also cause trouble swallowing and breathing.
Although polymyositis cannot be cured, its symptoms can be managed. Treatment options include anti-inflammatory medicines, immunosuppressive medicines, and physical therapy. Anti-inflammatory medicines, such as steroid medications or corticosteroids, are used to ease inflammation in the body. Corticosteroids can contribute to muscle weakness, so other medications may be used instead. Immunosuppressive medicines, such as azathioprine and methotrexate, block or slow down the body's immune system. Physical therapy includes special exercises that help stretch and strengthen the muscles.
Heat therapy and rest can also help ease muscle symptoms. Braces or other special devices can help support muscles and improve movement. It is important to talk to a healthcare provider about the risks, benefits, and possible side effects of all medications.
A strong clinician-patient relationship is important to improve healthcare outcomes, along with good communication among an interprofessional team, which may include a rheumatologist, neurologist, gastroenterologist, pulmonologist, primary clinician, physiotherapist, dietician, and nurses. Successful diagnosis and treatment at the initial stage can help patients live longer.
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It can be treated with immunosuppressive drugs
Polymyositis is a disease that causes muscles to become irritated and inflamed. The muscles eventually break down and become weak, making even simple movements difficult. It is a type of inflammatory myopathy, and while the exact cause is unknown, it is thought to be an autoimmune disorder. The condition can affect muscles all over the body, including the heart, and can cause pain and weakness in the ankles, wrists, and lower arms. Polymyositis can also affect swallowing and breathing and may lead to respiratory failure if not treated. It can be difficult to diagnose and is often mistaken for muscular dystrophy.
Polymyositis is a highly treatable disease, and its symptoms can be managed. The mainstay of therapy for polymyositis is drugs that suppress the immune system, known as immunosuppressive drugs. Glucocorticoids, particularly prednisone, are often the first-line treatment. These medications help to reduce inflammation and swelling and suppress damaging autoimmune responses. However, long-term use of high-dose glucocorticoid therapy may produce unwanted side effects such as decreased bone density, increased tissue swelling, and weight gain. Therefore, other immunosuppressive drugs may be beneficial for some patients. These include azathioprine, methotrexate, mycophenolate mofetil, tacrolimus, and cyclosporine. Intravenous immunoglobulin (IVIG) has also been used for the short-term treatment of steroid-resistant cases of polymyositis, and it has been found to improve muscle strength and creatine kinase levels.
Rituximab, a humanized monoclonal antibody, has shown encouraging results in patients who are refractory to first-line treatment. It has been found to improve muscle strength and endurance and decrease creatine kinase levels. The calcineurin inhibitor tacrolimus also appears to be effective, safe, and well-tolerated in patients with polymyositis that is refractory to other treatments. In addition to immunosuppressive drugs, physical therapy may be recommended to help improve muscle strength and avoid the development of contractures (muscle shortening/tightening). Supportive treatment can also help manage complications such as swallowing or breathing difficulties.
While polymyositis cannot be cured, treatment plans can be individualized to meet the needs of the affected person, and ongoing monitoring can optimize the treatment protocol. It is important to work with a healthcare provider to determine the best course of treatment and manage the condition effectively.
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Frequently asked questions
Polymyositis is a disease that causes muscles to become irritated and
The symptoms of polymyositis include profound muscular weakness, voice changes, problems with swallowing, constipation, and abnormal shortening of muscles. It can also cause difficulty breathing, malnutrition, weight loss, fever, fatigue, and stiffness.
The exact cause of polymyositis is unknown, but it is thought to be an autoimmune disorder, possibly triggered by a viral infection of muscle tissue. It is more common in women than in men and tends to develop between the ages of 50 to 70 years.
Treatment options for polymyositis include corticosteroids to reduce inflammation and immunosuppressive drugs such as azathioprine and methotrexate. While there is no cure for polymyositis, its symptoms can be managed through treatment.
While muscle twitching was not explicitly mentioned in the sources, polymyositis causes muscles to become irritated and inflamed, leading to weakness and pain. It affects large muscle groups on both sides of the body and can make even simple movements difficult.
