A chronic, progressive neuromuscular disease that is characterized by extreme muscular weakness (generally appearing first in the face) and progressive fatigue is

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Unexplained, spontaneous remissions can occur; however, the disease is usually a lifelong condition characterized by remissions and exacerbations. Muscle weakness is progressive in myasthenia gravis, and eventually paralysis occurs. A myasthenic crisis (sudden inability to swallow and respiratory distress) may be so severe that mechanical ventilation becomes necessary.

A Chronic, Progressive Neuromuscular Disease That Is Characterized by Extreme