Definition Myasthenia includes three groups of autoimmune disorders (myasthenia gravis, congenital myasthenic syndromes, Lambert-Eaton myasthenic syndromes) that affect the transmission of signals at the neuromuscular junctions that results in weakness and muscle fatiguability. With myasthenia gravis, ptosis, diplopia, dysphagia, and respiratory failure are often the initial symptoms. As the disease progresses, neck and limb-girdle muscle weakness […]