myotonia

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. acquisita acquired m. following exposure to certain toxins.
- m. atrophica SYN: myotonic dystrophy.
- m. congenita [MIM*160800] an uncommon muscle disorder, with onset in infancy or early childhood, characterized by muscle hypertrophy, m., and a nonprogressive course; autosomal dominant inheritance; caused by mutations in the skeletal muscle chloride channel gene (CLCN1) on chromosome 7q. SYN: Thomsen disease.
- m. dystrophica SYN: myotonic dystrophy.
- m. neonatorum SYN: neonatal tetany.

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myo·to·nia .mī-ə-'tō-nē-ə n tonic spasm of one or more muscles also a condition characterized by such spasms
myo·ton·ic -'tän-ik adj

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n.
a disorder of the muscle fibres that results in abnormally prolonged contractions. The patient has difficulty in relaxing a movement (e.g. his grip) after any vigorous effort. It is a feature of a hereditary condition starting in infancy or early childhood (myotonia congenita) and of a form of muscular dystrophy (dystrophia myotonica).

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myo·to·nia (mi″o-toґne-ə) [myo- + ton- + -ia] dystonia involving increased muscular irritability and contractility with decreased power of relaxation; cf. tetanus (def. 2). myotonic adj

Medical dictionary. 2011.

Look at other dictionaries:

  • Myotonia — Classification and external resources ICD 10 G71.1 ICD 9 359.2 …   Wikipedia

  • myotonia — [mī΄ō tō′nē ə] n. [ MYO + TON(IC) + IA] prolonged muscular spasm, often a manifestation of certain diseases of muscles myotonic [mī΄ətän′ik] adj …   English World dictionary

  • myotonia — myotonic /muy euh ton ik/, adj. /muy euh toh nee euh/, n. Pathol. tonic muscle spasm or muscular rigidity. [1895 1900; MYO + TONIA] * * * Disorder causing difficulty relaxing contracted voluntary muscles. All or only a few may be affected.… …   Universalium

  • myotonia — n. a disorder of the muscle fibres that results in abnormally prolonged contractions. The patient has difficulty in relaxing a movement (e.g. his grip) after any vigorous effort. It is a feature of a hereditary condition starting in infancy or… …   The new mediacal dictionary

  • myotonia — noun Etymology: New Latin Date: 1886 tonic spasm of one or more muscles; also a condition characterized by such spasms • myotonic adjective …   New Collegiate Dictionary

  • myotonia — noun A symptom of several muscular disorders characterized by the slow relaxation of the muscles after voluntary contraction or electrical stimulation …   Wiktionary

  • myotonia — n. uncontrollable muscle contractions, muscle spasm, inability to relax muscles (Medicine) …   English contemporary dictionary

  • myotonia — [ˌmʌɪə(ʊ) təʊnɪə] noun Medicine inability to relax voluntary muscle after vigorous effort. Derivatives myotonic adjective Origin C19: from myo + Gk tonos tone …   English new terms dictionary

  • myotonia — my·o·to·nia …   English syllables

  • myotonia — my•o•to•ni•a [[t]ˌmaɪ əˈtoʊ ni ə[/t]] n. pat tonic muscle spasm or muscular rigidity • Etymology: 1895–1900 my o•ton′ic ˈtɒn ɪk adj …   From formal English to slang

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