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Polymyositis is a rare inflammatory myopathy disease that causes muscles to become irritated and inflamed, eventually breaking down and becoming weak. It is an autoimmune disorder, meaning that the immune system attacks the body's own muscles instead of protecting them. The condition can affect muscles all over the body, causing weakness and pain, and making even simple movements difficult. Polymyositis can lead to severe, life-threatening complications, and while there is no cure, treatments such as steroids and physical therapy can help manage the symptoms.
| Characteristics | Values |
|---|---|
| Type of Disease | Muscle Disease |
| Type of Disorder | Rare Disorder |
| Cause | Abnormal activation of cytotoxic T lymphocytes (CD8 cells) and macrophages against muscular antigens |
| Occurrence | Affects muscles on both sides of the body, particularly near the abdomen |
| Age | Can develop at any age, but most common in adults between 30 to 60 years old |
| Diagnosis | Physical exam and tests such as blood tests, MRI, EMG, and muscle biopsy |
| Symptoms | Muscle pain, weakness, tenderness, trouble swallowing, difficulty talking, shortness of breath, fatigue, joint pain, stiffness, weight loss, trouble moving, fever, malnutrition, respiratory failure |
| Treatment | Steroids, immunosuppressive medicines, physical therapy, heat therapy, rest, braces or other special devices |
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What You'll Learn
Polymyositis is an autoimmune disorder
Polymyositis is a rare autoimmune disease that causes severe muscle weakness. It is characterised by symmetrical proximal muscle weakness, which means it affects muscles on both sides of the body, particularly near the abdomen, such as the neck, upper back, upper arms, shoulders, hips, and thighs. Polymyositis is a chronic inflammatory myopathy, meaning it causes inflammation and irritation in the muscles, which eventually start to break down and become weak. This can lead to severe, life-threatening complications as everyday activities become difficult.
The exact cause of polymyositis is unknown, but it is believed to be due to an abnormal activation of cytotoxic T lymphocytes (CD8 cells) and macrophages against muscular antigens. This results in damage to the endomysium of skeletal muscles. Different cytokines, including interleukins and tumour necrosis factors, play a role in causing rhabdomyolysis. Polymyositis mostly affects individuals already suffering from systematic diseases due to viral infections, malignancies, or other autoimmune disorders. It may also be triggered by certain medications or be an inherited condition.
Polymyositis typically develops in adults aged 30 to 60, although it can occur at any age. It is more common in women than in men and has been more frequently reported in Black populations compared to White populations. Diagnosis can be challenging, and there are no simple tests available. Healthcare providers will typically perform a physical examination, take a medical history, and conduct specific tests to rule out other conditions. These tests may include blood tests, electromyography (EMG), magnetic resonance imaging (MRI), and muscle biopsy.
While there is no cure for polymyositis, it can be managed through long-term treatment with steroids or immunomodulators, along with addressing the underlying etiological factors. Corticosteroids are often the first line of treatment, as they help lower inflammation and ease pain. Other treatments include immunosuppressive medications, physical therapy, heat therapy, and the use of braces or other special devices to support muscles and improve movement. Early treatment is crucial to avoid severe complications, and ongoing management is necessary to reduce symptoms and maintain quality of life.
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Symptoms of polymyositis
Polymyositis is a rare autoimmune disease that causes inflammation and weakness in muscles close to the centre of the body, which can lead to severe, life-threatening complications. It is characterised by symmetrical proximal muscle weakness, with the muscles of the shoulders, upper arms, hips, thighs, and neck typically displaying the most weakness.
The most common symptoms of polymyositis are muscle pain and weakness. Some people with polymyositis also experience tenderness and/or pain in their muscles. People with polymyositis may have trouble extending their knees, stepping down or climbing stairs, or experience increasing difficulty in activities such as getting up from a chair, carrying groceries, lifting a gallon of milk, or picking up their children.
Other symptoms of polymyositis include trouble swallowing (dysphagia), difficulty talking, shortness of breath or trouble breathing (dyspnea), fatigue (feeling tired all the time), joint pain, and stiffness (especially after waking up in the morning). Some people with polymyositis also experience weight loss.
In some cases, polymyositis can cause heart, respiratory, and swallowing problems, which are the most serious effects of the disease and require close monitoring. It can also cause interstitial lung disease (ILD), especially in anti-Jo-1 positive patients, presenting as shortness of breath and dry cough.
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Diagnosis of polymyositis
Polymyositis is a challenging condition to diagnose due to the absence of dermatological findings. The diagnosis of polymyositis is a process that involves multiple steps and tests.
The first step in diagnosing polymyositis is to obtain a detailed patient history, including family history, medication history, and any antecedent infections. Doctors will also ask about the patient's symptoms, including the gradual onset of myopathy with or without associated myalgia, the presence of joint pains, and difficulty in standing up from a sitting posture. Patients with upper body involvement may also experience difficulty combing hair, raising their arms above the head, and holding their neck upright.
After taking a complete medical history, doctors will perform a thorough physical examination. Blood work will be obtained, and electromyography (EMG) and nerve conduction tests may be performed. Imaging studies, such as magnetic resonance imaging (MRI), computed tomography (CT) scans, or ultrasonography, can also be useful in locating areas of muscle damage and diagnosing underlying malignancy.
In some cases, a muscle biopsy may be required to confirm the diagnosis of polymyositis. This minor procedure can be guided by MRI and EMG results, which help to identify the site of the biopsy. The biopsy findings will show chronic inflammatory infiltrate consisting of T lymphocytes, especially CD8+ T lymphocytes.
Overall, the diagnosis of polymyositis involves a comprehensive evaluation of the patient's medical history, symptoms, physical examination findings, and the results of various tests and procedures.
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Treatment of polymyositis
Polymyositis is a rare autoimmune disease that causes inflammation and weakness in muscles close to the centre of the body. It can lead to severe, life-threatening complications, especially if it affects an individual's ability to breathe and swallow. While there is no cure for polymyositis, treatments can help manage symptoms and reduce their impact on daily life.
The treatment of polymyositis focuses on managing inflammation and reducing immune system activity to prevent further damage to muscles. Here are some common treatment methods:
- Corticosteroids: These are prescription anti-inflammatory medications that help reduce inflammation in the muscles. Prednisone and methylprednisolone are commonly used corticosteroids, with a typical starting dose of 1 mg/kg of prednisone per day. It is important to gradually taper off steroids instead of withdrawing them suddenly.
- Immunosuppressants: These medications suppress the immune system's activity, reducing its ability to damage muscles. They are often used in combination with corticosteroids for synergistic effects.
- Intravenous Immunoglobulin (IVIG): IVIG involves injecting extra antibodies into a vein, redirecting the immune system's attack from the body's muscles to the introduced antibodies. This treatment method has shown significant improvement in patients with dysphagia due to esophageal involvement.
- Biologics: Certain biologics, such as infliximab and etanercept, have been effective in treating refractory cases of polymyositis.
- Other Immune Modulators: Cyclophosphamide, tacrolimus, mycophenolate mofetil, and rituximab are alternative immune modulators used to treat polymyositis. They can be beneficial for patients who do not respond well to steroids or experience adverse effects.
- Non-Pharmacological Treatment: Physical therapy and supervised resistive strength training activities are recommended to prevent disuse atrophy of the affected muscles. Patients are also advised to maintain a diet rich in protein.
While these treatments cannot cure polymyositis, they can help individuals manage their symptoms and achieve remission, a period when there is no inflammation in the affected muscles. It is important for patients to work closely with their healthcare providers to adjust treatments and manage symptoms before they lead to dangerous complications.
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Prognosis of polymyositis
Polymyositis is an inflammatory myopathy, a rare autoimmune disorder that causes severe muscle weakness in adults. It inflames the muscles, causing weakness and pain, and can make it difficult to perform everyday activities. The disease usually affects muscle groups closer to the centre of the body, such as hips, shoulders, thighs, upper arms, upper back, and neck. It can also cause trouble swallowing and breathing difficulties.
The prognosis for polymyositis varies greatly and depends on several factors, including the presence of other conditions or autoantibodies. The mortality rate ranges from 4% to 45%, and a favourable long-term outcome varies between 18% and 90%. Predictors of poor outcome include old age, male sex, dysphagia, longstanding symptoms before diagnosis or treatment, various types of myositis, pulmonary or cardiac involvement, and the presence of certain auto-antibodies.
The disease can be treated with steroids or immunomodulators, along with addressing the underlying etiological factors. Exercise can also help reduce inflammation and maintain independence. Adopting healthy lifestyle habits, such as eating healthy foods, reducing stress, getting enough sleep, and exercising regularly, can positively impact the disease course.
In a study of adult patients with polymyositis, 20% remained in remission and were off drugs after a median follow-up of 5 years, while 80% had a polycyclic or chronic continuous course. At long-term follow-up, 65% of patients who survived had normal strength, 34% had no or slight disability, and 16% had normal scores on the quality-of-life scale.
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Frequently asked questions
Polymyositis is a rare disease that causes muscles to become irritated and inflamed. It is an autoimmune disorder, which means that the body's immune system attacks its own tissues. Polymyositis can affect muscles all over the body and cause weakness, making even simple movements difficult.
The symptoms of polymyositis include muscle pain, weakness, and tenderness, trouble swallowing, difficulty talking, shortness of breath, fatigue, joint pain, stiffness, weight loss, and fever. It can also cause difficulty with everyday activities such as standing up after sitting, climbing stairs, lifting objects, or reaching overhead.
There is no cure for polymyositis, but the symptoms can be managed with treatment. Treatment options include anti-inflammatory medicines such as steroids or corticosteroids, immunosuppressive medicines, physical therapy, heat therapy, and rest. In some cases, braces or other special devices may be needed to support muscles and improve movement.
