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myasthenia (mi″әs-the´ne-ә) muscular debility or weakness. adj., myasthen´ic., adj.

myasthenia gravis an autoimmune disease of nerve and muscle function due to the presence of antibodies to acetylcholine receptors at the neuromuscular junction; characteristics include muscle fatigue and exhaustion that fluctuates in severity, without sensory disturbance or atrophy. It may be limited to one muscle group or become generalized with severe weakness and sometimes respiratory insufficiency. It may affect any muscle of the body, but especially those of the eyes, face, lips, tongue, throat, and neck. Called also Erb-Goldflam, Goldflam, or Goldflam-Erb disease.

neonatal myasthenia transient myasthenia gravis (lasting a week to a month) in infants born to myasthenic women.

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