An autoimmune disease characterized by weakness and fatigability of proximal muscles, particularly of the pelvic girdle, lower extremities, trunk, and shoulder girdle. There is relative sparing of extraocular and bulbar muscles. CARCINOMA, SMALL CELL of the lung is a frequently associated condition, although other malignancies and autoimmune diseases may be associated. Muscular weakness results from impaired impulse transmission at the NEUROMUSCULAR JUNCTION. Presynaptic calcium channel dysfunction leads to a reduced amount of acetylcholine being released in response to stimulation of the nerve. (From Adams et al., Principles of Neurology, 6th ed, pp 1471)

DUI

D015624 MeSH Browser

CUI

M0023968

Previous indexing

Muscular Diseases (1967-1988); Myasthenia Gravis (1980-1989); Neuromuscular Diseases (1980-1989); Neuromuscular Junction (1980-1986)

History note

1990

Public note

1990