electromyography in myasthenia gravis

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Electromyographic responses in myasthenia gravis are usually measured from the abductor digiti minimi muscle following repetitive supramaximal stimulation of the ulnar nerve at the wrist at 3Hz. There is a gradual diminution of the compound muscle potential. Check that the patient is not undertaking anticholinesterase medication.

Last reviewed 01/2018

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