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Muscle atrophy is the wasting or loss of muscle tissue, which can cause people to lose up to 40% of their muscle strength as they age. To diagnose muscle atrophy, a healthcare provider will perform a physical exam, ask about symptoms, and measure muscle mass. They may also order tests such as blood tests, muscle or nerve biopsies, and nerve conduction studies.
| Characteristics | Values |
|---|---|
| Physical examination | A doctor will look at your arms and legs and measure your muscle mass |
| Medical history | A doctor will ask about your symptoms, old or recent injuries, and previously diagnosed medical conditions |
| Blood test | A doctor may order a blood test for an enzyme called creatine kinase (CK), which leaks out of muscles that are deteriorating |
| Muscle or nerve biopsy | A doctor may order a muscle or nerve biopsy to help with diagnosis |
| Electromyography (EMG) | A doctor may order an EMG to help with diagnosis |
| Nerve conduction studies | A doctor may order nerve conduction studies to help with diagnosis |
| Computed tomography (CT) scan | A doctor may order a CT scan to help with diagnosis |
| Magnetic resonance imaging (MRI) scan | A doctor may order an MRI scan to help with diagnosis |
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Physical examination
To assess muscle atrophy, a physical examination is required. This will involve a healthcare provider looking at your arms and legs and measuring your muscle mass. They will also ask about your symptoms and medical history, including any old or recent injuries, and medications you are taking.
The physical examination will help determine which nerves are affected and whether the atrophy is physiologic, pathologic, or neurogenic. Physiologic atrophy is caused by not using the muscles enough and can sometimes be reversed with exercise and a healthy diet. Neurogenic atrophy, on the other hand, is caused by physical damage to the nerves and typically cannot be reversed.
During the physical examination, the healthcare provider may also perform some simple tests to distinguish muscle atrophy from similar conditions, such as muscular dystrophy. They may also order additional tests, such as blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, or magnetic resonance imaging (MRI) scans.
It is important to note that muscle atrophy can result in a significant loss of muscle strength, with people potentially losing 20 to 40 percent of their muscle mass as they age. Therefore, early detection and proper assessment through physical examination and appropriate tests are crucial for managing this condition.
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Medical history
Muscle atrophy is the wasting or loss of muscle tissue, which can result in a person losing up to 40% of their muscle strength as they age. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using muscles enough. Neurogenic atrophy is caused by physical damage to nerves.
To diagnose muscle atrophy, a healthcare provider will give a patient a physical exam and ask about their symptoms. They will look at the patient's arms and legs and measure their muscle mass. The provider may also ask about the patient's medical history, including old or recent injuries, previously diagnosed medical conditions, and medications they are taking. This information can help determine which nerves are affected by the atrophy.
If muscle atrophy is caused by another condition, further testing may be required to diagnose that condition. Blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, and magnetic resonance imaging (MRI) scans may be ordered. These tests can help rule out certain diseases and determine the extent of nerve damage.
Treatment for muscle atrophy may include physical therapy, ultrasound therapy, and, in some cases, surgery. Physiologic atrophy can sometimes be reversed with exercise and a healthy diet, while neurogenic atrophy typically cannot be reversed due to the physical damage to nerves.
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Blood tests
Muscle atrophy is the wasting or loss of muscle tissue. People may lose 20 to 40% of their muscle and, along with it, their strength as they age. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using the muscles enough.
To diagnose muscle atrophy, a healthcare provider will give a physical exam and ask about symptoms. They will look at the arms and legs and measure muscle mass. They may also order tests, including blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, and magnetic resonance imaging (MRI) scans.
Treatment for muscle atrophy may include physical therapy, ultrasound therapy, and, in some cases, surgery to correct a contracture. Disuse (physiologic) atrophy can sometimes be reversed with exercise and a healthy diet. Working out in the water can reduce muscle workload. Neurogenic atrophy typically cannot be reversed because of the physical damage that has been done to the nerves.
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Muscle biopsy
Muscle atrophy is the wasting or loss of muscle tissue, which can cause people to lose 20 to 40% of their muscle strength as they age. It can be caused by not using muscles enough, or by the muscles losing their nerve supply.
To diagnose muscle atrophy, a healthcare provider will perform a physical exam and ask about symptoms. They will measure muscle mass in the arms and legs, and may order tests, including a blood test, muscle or nerve biopsy, electromyography (EMG), nerve conduction studies, a computed tomography (CT) scan, or a magnetic resonance imaging (MRI) scan.
A muscle biopsy is a diagnostic procedure in which a small sample of muscle tissue is removed for examination under a microscope. This can help to identify any abnormalities in the muscle tissue, such as inflammation, damage, or disease. The procedure is usually performed under local anaesthetic, and involves inserting a small needle or incision into the muscle to extract the tissue sample.
There are several types of muscle biopsy, including open biopsy, needle biopsy, and fine-needle aspiration. An open biopsy involves making a small incision in the skin and removing a small piece of muscle tissue. A needle biopsy uses a thin, hollow needle to extract a smaller sample of tissue, and a fine-needle aspiration uses an even thinner needle to remove a small amount of fluid and cells from the muscle.
The type of biopsy performed will depend on the location and size of the muscle, as well as the specific symptoms and suspected diagnosis. Muscle biopsies are often used to help diagnose neuromuscular diseases, such as muscular dystrophy or spinal muscular atrophy (SMA). They can also be used to monitor the progression of a disease or the effectiveness of a treatment.
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Electromyography (EMG)
EMG can help to identify muscle damage or nerve damage that may be causing muscle atrophy. It can also help to determine the severity of the condition and guide treatment decisions. The test is usually performed by a neurologist or a physiatrist, and it is often done in conjunction with nerve conduction studies, which measure the speed at which nerves conduct electrical impulses.
During an EMG, the doctor will insert a small, sterile needle electrode into the muscle being tested. The needle is connected to a wire, which transmits electrical signals to a machine that amplifies and displays them on a screen. The doctor will then ask the patient to contract and relax the muscle, and the electrical activity will be recorded. The procedure is usually not painful, but some patients may experience minor discomfort.
The results of an EMG can provide valuable information about the health of the muscles and nerves. If the test shows abnormal electrical activity, it may indicate muscle or nerve damage. This information can help doctors diagnose conditions such as muscular dystrophy, amyotrophic lateral sclerosis (ALS), or carpal tunnel syndrome. EMG can also be used to monitor the progression of a disease or the effectiveness of treatment.
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Frequently asked questions
Muscle atrophy is diagnosed through a physical examination, which involves measuring muscle mass and looking at the arms and legs. The healthcare provider may also ask about symptoms, order tests, and take a blood sample.
Tests used to diagnose muscle atrophy include blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, CT scans, and MRI scans.
Muscle atrophy is the wasting or loss of muscle tissue, which can result in a decrease in muscle strength. This can be caused by not using muscles enough or by nerve damage.
Muscle atrophy caused by disuse (physiologic atrophy) can sometimes be reversed with exercise and a healthy diet. However, neurogenic atrophy typically cannot be reversed due to the physical damage to the nerves.
Muscle weakness and hypotonia are the first signs that raise suspicion for spinal muscular atrophy (SMA) in babies. Other signs include a history of motor difficulties, loss of motor skills, and tongue fasciculations (involuntary twitches).
