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Muscle diseases, or muscle disorders, refer to a range of conditions that affect the nerves, muscles, or neuromuscular junction. These disorders can cause muscle weakness, pain, or even paralysis. In some cases, muscle disorders may be genetic, such as muscular dystrophy, or acquired after birth. To diagnose a muscle disorder, a physician will typically examine the patient, review their medical history, and may order additional diagnostic tests such as a creatine kinase blood test, genetic tests, or a muscle biopsy. Treatment options vary depending on the specific disorder and may include medications, physical therapy, occupational therapy, or surgery.
| Characteristics | Values |
|---|---|
| Who diagnoses muscle diseases | Physicians/doctors, healthcare providers |
| What they examine | Patient's reflexes, muscle strength, medical and family history, other symptoms |
| What they order | Diagnostic tests, including creatine kinase blood test, genetic tests, muscle biopsy, electromyography (EMG) |
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What You'll Learn
- Physicians examine patients, their medical history and symptoms, and may order further tests
- Electromyography (EMG) measures electrical activity in muscles and nerves
- Genetic tests can identify gene mutations linked to muscular dystrophy
- Muscle biopsies involve examining a small sample of muscle tissue under a microscope
- Creatine kinase blood tests detect elevated levels of the enzyme, which may indicate muscle damage
Physicians examine patients, their medical history and symptoms, and may order further tests
Muscle disorders can be caused by injury or overuse, genetic disorders, some cancers, inflammation, nerve diseases, infections, certain medications, or unknown factors. They can cause weakness, pain, or paralysis. A physician will examine the patient and take a medical and family history. They will check the patient's reflexes and muscle strength, as well as evaluate other symptoms. This may lead the physician to order further diagnostic tests, including laboratory tests, imaging tests, and other procedures.
Laboratory tests may include blood tests to measure levels of C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), which indicate inflammation. The level of creatine kinase, a muscle enzyme that is released into the bloodstream when muscles are damaged, may also be tested.
Imaging tests can include X-rays to examine bone density and identify fractures or other abnormalities. Magnetic resonance imaging (MRI) is often used in preference to arthrography, which involves injecting a radiopaque dye into a joint space to view internal structures. Computed tomography (CT) scans are another option. Ultrasonography is also used to identify abnormalities and inflammation and can guide needle placement for procedures such as injecting medications or removing joint fluid.
Other diagnostic procedures may involve inserting a needle into the joint space to extract and analyze joint fluid, which can help diagnose infections or conditions like gout or arthritis. Electromyography (EMG) and nerve conduction studies can be used to evaluate neuromuscular disorders and confirm the presence of myopathy, neuropathy, or diseases of the neuromuscular junction.
A thorough assessment by an experienced team is crucial for an accurate diagnosis and subsequent treatment of muscle disorders.
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Electromyography (EMG) measures electrical activity in muscles and nerves
Muscle disorders can be caused by several factors, including injury or overuse, genetic disorders, certain types of cancer, inflammation, nerve issues, infections, and certain medications. Neuromuscular disorders, a type of muscle disorder, affect the motor and sensory nerves in the body, causing problems with the muscles, the nerves that control them, and the communication between the two.
Electromyography (EMG) is a diagnostic test that evaluates the health and function of skeletal muscles and the nerves that control them. EMG measures the electrical activity of muscles during rest, slight contraction, and forceful contraction. The test can help detect neuromuscular abnormalities and issues with motor nerves, muscles, or the communication between the two.
During an EMG test, a small needle with an electrode is inserted through the skin into the muscle. The electrical activity picked up by the electrode is then displayed on an oscilloscope, which shows the electrical activity in the form of waves. An audio-amplifier is used so that the electrical activity can be heard. The electrical activity of the muscle increases as the muscle contracts more forcefully.
EMG is often performed alongside a nerve conduction study (NCS), which measures the flow of electrical current through a nerve before it reaches a muscle. NCS can determine nerve damage and destruction and is used to detect the presence, location, and extent of diseases that damage the nerves and muscles.
A physician will examine a patient and take their medical and family history. They will check the patient's reflexes and muscle strength and evaluate other symptoms before ordering diagnostic tests, which may include EMG and NCS.
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Genetic tests can identify gene mutations linked to muscular dystrophy
Muscle disorders can cause weakness, pain, or even paralysis. They can be caused by injury or overuse, cancer, inflammation, nerve diseases, infections, certain medications, or genetic disorders such as muscular dystrophy. Neuromuscular disorders, a type of muscle disorder, affect the nerves that control voluntary muscles and the nerves that communicate sensory information back to the brain.
Muscular dystrophy (MD) refers to a group of more than 30 genetic (inherited) conditions that affect the functioning of muscles. In general, the symptoms of muscular dystrophy worsen over time, affecting a person's ability to move, walk, and perform daily activities. Some forms of muscular dystrophy are present at birth or develop during childhood, while others develop during adulthood. As muscular dystrophy is a genetic condition, there is currently no way to prevent it. However, certain steps can be taken to prevent or delay complications and improve quality of life, such as maintaining a healthy diet and weight, exercising, and staying hydrated.
The accuracy of genetic tests varies and depends on the type of test and its purpose. For example, a result indicating an MD mutation is unlikely to be wrong if the patient is already exhibiting symptoms and other tests support an MD diagnosis. Additionally, genetic tests that focus on a known mutation that runs in the family are more likely to produce accurate results. If a genetic test does not reveal a genetic mutation linked to MD, additional tests may be necessary to understand the cause of the symptoms.
It is important to consult with a physician or healthcare provider for a thorough assessment and accurate diagnosis of muscular dystrophy or other muscle disorders. They will examine the patient, take a medical and family history, check reflexes and muscle strength, and evaluate other symptoms before ordering any diagnostic tests.
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Muscle biopsies involve examining a small sample of muscle tissue under a microscope
Muscle biopsies are a procedure used to diagnose diseases involving muscle tissue. A muscle biopsy involves examining a small sample of muscle tissue under a microscope. The sample is taken by inserting a biopsy needle into the muscle. If a larger sample is required, an open biopsy may be performed, involving a small incision in the skin. The muscle selected for biopsy depends on the location of symptoms, which may include pain or weakness. Commonly selected muscles include the bicep, deltoid, or quadriceps.
A muscle biopsy can be useful in diagnosing neuromuscular disorders, which affect the motor and sensory nerves in the body. These disorders can cause problems with the muscles, nerves that control the muscles, and the communication between them. Myopathy, a group of muscle disorders, can result in muscle weakness and destruction. Neuromuscular disorders can be inherited or acquired after birth.
The biopsy procedure begins with cleaning the area and administering a local anesthetic. The healthcare provider will then insert the needle and remove the tissue sample. If an open biopsy is required, the provider will make a small incision and may use small, sharp scissors to cut the muscle tissue. After applying pressure to stop any bleeding, the wound will be closed with adhesive strips or stitches and covered with a bandage or dressing.
The muscle tissue sample is then sent to a lab for examination under a microscope. The pathologist may apply stains or test for the presence of certain antibodies. Complications from muscle biopsies are rare but can include muscle hernia, wound re-opening, or accidental injury to muscles, nerves, or blood vessels.
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Creatine kinase blood tests detect elevated levels of the enzyme, which may indicate muscle damage
Creatine kinase (CK) is an enzyme found in skeletal muscle, heart muscle, and the brain. CK levels in the blood are normally quite low, as most of the CK in the body is found in skeletal muscles. However, when muscle, heart, or brain tissues are damaged, they leak larger amounts of CK into the bloodstream. CK blood tests are used to detect elevated levels of this enzyme, which may indicate muscle damage.
CK blood tests are often used to help diagnose and monitor muscle injuries, including those from accidents, serious burns, extreme exercise, or physical trauma, such as crushing injuries. They can also be used to detect muscle diseases (myopathies) such as muscular dystrophy, a group of inherited muscle diseases that weaken muscles over time, or rhabdomyolysis, a condition where there is a rapid breakdown of muscle tissue, which can lead to sudden kidney failure.
In addition to muscle injuries and diseases, CK blood tests can also be used to help diagnose conditions affecting the heart muscle and the brain. For example, high levels of CK-MB enzymes are most likely due to damage to the heart muscle, often caused by a heart attack or inflammation (myocarditis). Furthermore, higher than normal CK-BB enzymes may indicate a stroke or brain injury, while conditions affecting smooth muscles can also increase CK-BB levels.
It is important to note that elevated CK levels do not always indicate a medical condition. Factors such as exercise, certain medications, and injections can temporarily increase CK levels. Additionally, CK levels vary depending on gender, race, age, muscle mass, and physical activity. Healthcare providers may order multiple CK tests over time to check the progress of CK levels and determine if muscle damage is ongoing or resolving.
When diagnosing muscle diseases, physicians will typically examine the patient, take a medical and family history, and evaluate symptoms such as muscle strength and reflexes. Based on this initial assessment, they may then order additional diagnostic tests, such as CK blood tests, to help identify the specific muscle disorder. An experienced multidisciplinary team is often required to make an accurate diagnosis and determine the most appropriate treatment.
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Frequently asked questions
Muscular dystrophy is a group of more than 30 genetic conditions that cause muscle weakness and other muscle-related symptoms. It is caused by changes in the genes that make proteins needed to form healthy muscles.
Symptoms of muscular dystrophy include muscle weakness that gets worse over time, making everyday tasks harder to do. Other symptoms include muscle pain and stiffness, learning or behavioural challenges, and delayed growth.
If muscular dystrophy is suspected, a healthcare provider will likely perform a physical exam, neurological exam, and muscle exam. They will ask detailed questions about symptoms and medical history. They may also recommend diagnostic tests such as a creatine kinase blood test, genetic tests, muscle biopsy, or electromyography (EMG).
A physician or healthcare provider will examine the patient, take a medical and family history, and evaluate symptoms. They may order additional diagnostic tests to determine a diagnosis. An experienced multidisciplinary team is required to make an accurate diagnosis and provide appropriate treatment.
