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myasthenia gravis myasthenia gravÂ·is (grÄv'Ä­s) n. A disease characterized by progressive fatigue and generalized weakness of the skeletal muscles, especially those of the face, neck, arms, and legs, caused by impaired transmission of nerve impulses following an autoimmune attack on acetylcholine receptors. Also called Goldflam disease.
From Wikipedia, the free encyclopedia. Myasthenia gravis (from Greek Î¼ÏÏ muscle, á¼ÏÎ¸Î­Î½ÎµÎ¹Î± weakness, and Latin: gravis serious; abbreviated MG) is a neuromuscular disease that leads to fluctuating muscle weakness and fatigue.yasthenia is treated with medications such as acetylcholinesterase inhibitors or immunosuppressants, and, in selected cases, thymectomy (surgical removal of the thymus gland). The disease is diagnosed in 3 to 30 people per million per year.