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All about myasthenia gravis causes of myasthenia gravis risk factors for myasthenia gravis thymus gland signs and symptoms of myasthenia gravis diagnosis of myasthenia gravis myasthenia gravis treatment myasthenic crisis myasthenia gravis and pregnancy prognosis of myasthenia gravis

How is myasthenia gravis diagnosed?

Myasthenia gravis is often diagnosed accurately by a careful medical history and a neuromuscular exam, but several tests are used to confirm the diagnosis. Other conditions causing worsening of bulbar and skeletal muscles must be considered, including drug-induced myasthenia, thyroid disease, Lambert-Eaton myasthenic syndrome, botulism, and

inherited muscular dystrophies.

Myasthenia gravis causes characteristic changes in the electrical responses of muscles that may be observed with an electromyogram, which measures muscular response to electrical stimulation. Repetitive nerve stimulation leads to reduction in the height of the measured muscle response, reflecting the muscle's tendency to become fatigued.

Blood tests may confirm the presence of the antibody to the acetylcholine receptor, though up to a quarter of myasthenia gravis patients will not have detectable levels. A chest x ray or chest

Another test is called the edrophonium test. This approach requires the intravenous administration of edrophonium chloride or Tensilon®, a drug that blocks the breakdown of acetylcholine and temporarily increases the levels of acetylcholine at the neuromuscular junction. In people with myasthenia gravis involving the eye muscles, edrophonium chloride will briefly relieve weakness. Other methods to confirm the diagnosis include a version of nerve conduction study which tests for specific muscle fatigue by repetitive nerve stimulation. This test records weakening muscle responses when the nerves are repetitively stimulated, and helps to differentiate nerve disorders from muscle disorders. Repetitive stimulation of a nerve during a nerve conduction study may demonstrate decrements of the muscle action potential due to impaired nerve-to-muscle transmission.

More information on myasthenia gravis

What is myasthenia gravis? - Myasthenia gravis is a disorder of neuromuscular function due to the presence of antibodies to acetylcholine receptors at the neuromuscular junction.
What causes myasthenia gravis? - Myasthenia gravis is caused by a defect in the transmission of nerve impulses to muscles. Deficiency of acetylcholine at the neuromuscular junctions causes myasthenia gravis.
What're the risk factors for myasthenia gravis? - Myasthenia gravis commonly affects young adult women and older men. Myasthenia gravis may be associated with other autoimmune diseases.
What's the role of the thymus gland? - The thymus gland plays an important role in the development of the immune system in early life. In most adults with myasthenia gravis, the thymus gland is abnormal.
What're the signs and symptoms of myasthenia gravis? - Symptoms of myasthenia gravis include fatigue and exhaustion of the muscular system with a tendency to fluctuate in severity without sensory disturbance or atrophy.
How is myasthenia gravis diagnosed? - Myasthenia gravis is often diagnosed accurately by a careful medical history and a neuromuscular exam, but several tests are used to confirm the diagnosis.
What's the treatment for myasthenia gravis? - The treatment of myasthenia gravis depends on several factors, including age, overall health, severity of disease, and rate of disease progression.
What's a myasthenic crisis? - A myasthenic crisis occurs when weakness affects the muscles that control breathing. Plasma exchange may be performed to treat myasthenic crisis.
Does myasthenia gravis affect pregnancy? - Pregnant women with myasthenia gravis often have more weakness and fatigue because of the added weight and effort of pregnancy.
What's the prognosis of myasthenia gravis? - Myasthenia gravis is a chronic disease. With treatment, patients with myasthenia gravis will have significant improvement of their muscle weakness.
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