Hypertonia

ICD-10 | P94.1
ICD-9 | 358, 779.89
DiseasesDB | 20872
MeSH | D009122

Hypertonia is a condition marked by an abnormal increase in the tightness of muscle tone and a reduced ability of a muscle to stretch (i.e. an increased stiffness). It is generally accompanied by (increased) spasticity of the particular muscles.

Damage to upper motor neurons causes hypertonia, as well as spasticity (overactive reflexes) and rigidity (constant muscle contractions). A form of hypertonia is known as Paratonia which is associated with dementia.

## Contents

* 1 Causes
* 1.1 Life Threatening Causes
* 1.2 Common Causes
* 1.3 Causes by Organ System
* 1.4 Causes in Alphabetical Order
* 2 See also
* 3 External links

## Causes

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### Life Threatening Causes

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### Common Causes

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### Causes by Organ System

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Cardiovascular | No underlying causes

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Chemical/Poisoning | No underlying causes
Dental | No underlying causes
Dermatologic | No underlying causes
Drug Side Effect | Cefaclor, Cidofovir, Pergolide, Terbutaline
Ear Nose Throat | No underlying causes
Endocrine | No underlying causes
Environmental | No underlying causes
Gastroenterologic | No underlying causes
Genetic | No underlying causes
Hematologic | No underlying causes
Iatrogenic | No underlying causes
Infectious Disease | No underlying causes
Musculoskeletal/Orthopedic | No underlying causes
Neurologic | No underlying causes
Nutritional/Metabolic | No underlying causes
Obstetric/Gynecologic | No underlying causes
Oncologic | No underlying causes
Ophthalmologic | No underlying causes
Overdose/Toxicity | No underlying causes
Psychiatric | No underlying causes
Pulmonary | No underlying causes
Renal/Electrolyte | No underlying causes
Rheumatology/Immunology/Allergy | No underlying causes
Sexual | No underlying causes
Trauma | No underlying causes
Urologic | No underlying causes
Miscellaneous | No underlying causes

### Causes in Alphabetical Order

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List the causes of the disease in alphabetical order. You may need to list across the page, as seen here

* Cidofovir
* Pergolide
* Terbutaline

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## See also

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* Hypotonia
* Paratonia
* Clasp-knife response

## External links

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* "The Clasp Knife Phenomenon" at mcg.edu

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