myotonia (mI-o-to´ne-a)

Delayed relaxation of a muscle after a strong contraction, or prolonged contraction after mechanical stimulation (as by percussion) or brief electrical stimulation; due to abnormality of the muscle membrane, specifically the ion channels. [myo- + G. tonos, tension, stretching]
m. acquisi´ta acquired m. following exposure to certain toxins.
m. atroph´ica myotonic dystrophy
m. congen´ita [MIM*160800] a hereditary disease marked by momentary tonic spasms occurring when a voluntary movement is attempted.Thomsen's disease;
m. dystroph´ica myotonic dystrophy
m. neonato´rum neonatal tetany


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