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20-September-2008 09:55:49 - Paralysis or section by expanding it. Further information might be found on the talk page or at requests for expansion. January 2008 February 2007 Symptom/Sign: Paralysis Classifications and external resources ICD-10 ICD-9 MeSH D010243 Paralysed redirects here. For other uses see Paralysed disambiguation Paralysis is the complete loss of muscle function for one or more muscle groups. Paralysis can cause loss of feeling or loss of mobility in the affected area. Contents 1 Causes 2 Variations 3 Paralysis in the animal world 4 See also Causes Paralysis is most often caused by damage to the nervous system or brain, especially the spinal cord. Partial paralysis can also occur in the REM stage of sleep. Major causes are stroke, trauma, poliomyelitis, amyotrophic lateral sclerosis ALS, botulism, spina bifida, multiple sclerosis, and Guillain-Barré syndrome. Poisons that interfere with nerve function, such as curare, can also cause paralysis. Many causes of this are varied, and could also be unknown. Variations Paralysis may be localized, or generalized, or it may follow a certain pattern. For example, localized paralysis occurs in Bell's palsy where one side of the face may be paralyzed due to inflammation of the facial nerve on that side. Patients with stroke may be weak throughout their body global paralysis or have hemiplegia weakness on one side of the body or other patterns of paralysis depending on the area of damage in the brain. Other patterns of paralysis arise due to different lesions and their sequelae. For example, lower spinal cord damage from a severe back injury may result in paraplegia, while an injury higher up on the spinal cord, such as a neck injury, can cause quadriplegia. Patients with paraplegia or quadriplegia often use equipment such as a wheelchair or standing frame for mobility and to regain some independence. Most paralyses caused by nervous system damage are constant in nature; however, there are forms of periodic paralysis, including sleep paralysis, which are caused by other factors. Paralysis in the animal world Many species of animals use paralyzing toxins in order to capture prey, evade predation, or both. One famous example is the tetrodotoxin of fish species such as Takifugu rubripes, the famously lethal pufferfish of Japanese fugu. This toxin works by binding to sodium channels in nerve cells, preventing the cells' proper function. A non-lethal dose of this toxin results in temporary paralysis. This toxin is also present in many other species ranging from toads to nemerteans. Another interesting use of paralysis in the natural world is the behavior of some species of wasp. In order to complete the reproductive cycle, the female wasp first paralyzes a prey item such as a grasshopper and then places it into her nest. Eggs are then laid on the paralyzed insect, which is devoured by the larvae after they hatch. Many snakes also exhibit powerful neurotoxins that can cause non-permanent paralysis or death. Paralysis can be seen in breeds of dogs that are chondrodysplastic. These dogs have short legs, and may also have short muzzles. Their intervertebral disc material can calcify and become more brittle. In such cases, the disc may rupture, with disc material ending up in the spinal canal, or rupturing more laterally to press on spinal nerves. A minor rupture may only result in paresis, but a major rupture can cause enough damage to result in complete paralysis. If no signs of pain can be elicited, surgery should be performed within 24 hours of the incident, to remove the disc material and relieve pressure on the spinal cord. After 24 hours, the chance of recovery declines rapidly, since with continued pressure, the spinal cord tissue deteriorates and dies. Another type of paralysis is caused by a fibrocartilaginous embolism. This is a microscopic piece of disc material that breaks off and becomes lodged in a spinal artery. Nerves served by the artery will die when deprived of blood. The German Shepherd is especially prone to developing degenerative myelopathy. This is a deterioration of nerves in the spinal cord, starting in the posterior part of the cord. Dogs so affected will become gradually weaker in the hind legs as nerves die off. Eventually their hind legs become useless. They often also exhibit fecal and urinary incontinence. As the disease progresses, the paresis and paralysis gradually move forward. This disease also affects other large breeds of dogs. It is suspected to be an autoimmune problem. Cats with heart murmurs may develop blood clots which travel through arteries. If the clot is large enough to block one or both femoral arteries, there may be hind leg paralysis because the major source of blood flow to the hind leg is blocked. See also Spinal cord injury Paraplegia Quadriplegia Muscle relaxant Ptosis Sleep paralysis Hemiparesis Beriberi Neuroprosthetics Brain-computer interface Tonic immobility Cerebral palsy Cobra Toxin v d e Cerebral palsy and other paralytic syndromes G80-G83, 342-344 Paresis and plegia NOS Paralysis - Quadriplegia - Triplegia - Hemiplegia/Hemiparesis - Paraplegia/Diplegia - Monoplegia Flaccid vs. spastic Flaccid paralysis - Spastic diplegia - Spastic paraplegia Specific types Cerebral palsy - Cauda equina syndrome - Locked-In syndrome Retrieved from http://en..org/wiki/Paralysis Categories: Neurological disorders | SymptomsHidden categories: Articles to be expanded since January 2008 | All articles to be expanded | Articles lacking sources from February 2007 | All articles lacking sources Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Aymar বাংলা ÄŒesky Deutsch Español Français Hrvatski Bahasa Indonesia Italiano עברית Nederlands 日本語 ‪Norsk bokmÃ¥l‬ Polski Português РуÑ?Ñ?кий Simple English Suomi తెలà±?à°—à±? This page was last modified on 27 July 2008, at 21:54
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