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Bienfang's test is a clinical test used in the diagnosis of ocular myasthenia gravis. It is used in conjunction with other examination techniques such as Cogan's lid twitch test [ 1 ] or enhancement of blepharoptosis from prolonged upward gaze.
Ocular myasthenia gravis (MG) is a disease of the neuromuscular junction resulting in hallmark variability in muscle weakness and fatigability. MG is an autoimmune disease where anomalous antibodies are produced against the naturally occurring acetylcholine receptors in voluntary muscles.
Thus, this test can be used to clinically differentiate between ocular myasthenia gravis and normal individuals. Since myasthenia gravis affects all skeletal muscles, eyelid drooping is often bilateral. It is sometimes done in conjunction with tensilon test, where edrophonium is injected to look for reversibility of eyelid drooping. In ...
Blood tests are also often used to identify associated antibodies. "About 80% of patients with MG are positive" for the antibody behind the immune system dysfunction, says Weidmayer.
Diagnosis can be supported by blood tests for specific antibodies, the edrophonium test, electromyography (EMG), or a nerve conduction study. [1] Myasthenia gravis is generally treated with medications known as acetylcholinesterase inhibitors, such as neostigmine and pyridostigmine. [1]
Acquired myasthenia gravis is the most common neuromuscular junction disease.(reference 7) Important observations were made by Patrick and Lindstrom in 1973 when they found that antibodies attacking the acetylcholine receptors were present in around 85% of cases of myasthenia gravis.(reference renamed form 13)(reference 36) The remaining ...
A tensilon test, also called an edrophonium test, is a pharmacological test used for the diagnosis of certain neural diseases, especially myasthenia gravis. [1] It is also used to distinguish a myasthenic crisis from a cholinergic crisis in individuals undergoing treatment for myasthenia gravis.
The diagnosis is usually confirmed with electromyography and blood tests; these also distinguish it from myasthenia gravis, a related autoimmune neuromuscular disease. [4] If the disease is associated with cancer, direct treatment of the cancer often relieves the symptoms of LEMS.
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