Increased tightness of muscle tone. Untreated hypertonia can lead to loss of function and deformity. Treatment is by physical and/or occupational therapy, and in some cases muscle relaxant medication. Injections of botulism toxin (botox) are a recent treatment for chronic hypertonia in cerebral palsy and other disorders. Also known as spasticity.
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Extreme tension of the muscles or arteries. SYN: hypertonicity (1). [hyper- + G. tonos, tension]
- h. polycythemica a form of polycythemia without a prominent degree of splenomegaly, but with increased blood pressure.
- sympathetic h. overfunction of the sympathetic nervous system, often experienced as anxiety.

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hy·per·to·nia .hī-pər-'tō-nē-ə n HYPERTONICITY

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exceptionally high tension in muscles.

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hy·per·to·nia (hi″pər-toґne-ə) [hyper- + ton- + -ia] excessive tone of the skeletal muscles, so that they have increased resistance to passive stretching and reflexes are often exaggerated; this usually indicates upper motor neuron injury.

Medical dictionary. 2011.

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  • Hypertonia — This article is about increased activity and resistance in muscles. For increased blood pressure, see Hypertension. Hypertonia Classification and external resources ICD 10 P94.1 ICD 9 …   Wikipedia

  • hypertonia — noun Date: circa 1842 the condition of exhibiting excessive muscular tone or tension …   New Collegiate Dictionary

  • hypertonia — /huy peuhr toh nee euh/, n. Pathol. increased rigidity, tension, and spasticity of the muscles. [1835 45; HYPER + TONIA] * * * …   Universalium

  • hypertonia — noun An abnormal increase in tightness of muscle tone, common in cerebral palsy …   Wiktionary

  • hypertonia — n. condition which results in excessive muscular tone or tension …   English contemporary dictionary

  • hypertonia — hy·per·to·nia …   English syllables

  • hypertonia — hypertonicity; n. exceptionally high tension in muscles …   The new mediacal dictionary

  • hypertonia — hy•per•to•ni•a [[t]ˌhaɪ pərˈtoʊ ni ə[/t]] n. phl pat increased rigidity, tension, and spasticity of the muscles • Etymology: 1835–45 …   From formal English to slang

  • hypertonia — noun (of muscular tissue) the state of being hypertonic • Syn: ↑hypertonus, ↑hypertonicity • Ant: ↑hypotonicity (for: ↑hypertonicity), ↑hypotonus (for: ↑ …   Useful english dictionary

  • hypertonia polycythaemica — increased blood pressure associated with polycythemia …   Medical dictionary

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