MYOTONIC DISORDER
\mˌa͡ɪətˈɒnɪk dɪsˈɔːdə], \mˌaɪətˈɒnɪk dɪsˈɔːdə], \m_ˌaɪ_ə_t_ˈɒ_n_ɪ_k d_ɪ_s_ˈɔː_d_ə]\
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Diseases characterized by MYOTONIA, which may be inherited or acquired. Myotonia may be restricted to certain muscles (e.g., intrinsic hand muscles) or occur as a generalized condition. These disorders may be associated with abnormal muscle SODIUM CHANNEL and CHLORIDE CHANNELS. MYOTONIC DYSTROPHY and MYOTONIA CONGENITA represent two relatively common forms of this disorder. Proximal myotonic myopathy often presents with myotonia and muscle pain in early adulthood and later in life thigh muscle weakness and cataracts develop. (From Adams et al., Principles of Neurology, 6th ed, p1392)
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