View source for Restless legs syndrome

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{{Infobox_Disease |
  Name           = Restless legs syndrome |
  Image          = RLS-Schlafmuster.jpg |
  Caption        = Sleep pattern of a Restless Legs Syndrome patient (red) vs. a healthy sleep pattern (blue). |
  DiseasesDB     = 29476 |
  ICD10          = {{ICD10|G|25|8|g|20}} |
  ICD9           = {{ICD9|333.94}} |
  ICDO           = |
  OMIM           = 102300 |
  OMIM_mult      = {{OMIM2|608831}} |
  MedlinePlus    = |
  eMedicineSubj  = |
  eMedicineTopic = |
  MeshID         = D012148 |
}}
{{SI}}

'''For patient information click [[{{PAGENAME}} (patient information)|here]]'''

{{CMG}}; '''Associate Editor-In-Chief:''' {{CZ}}

==Overview==

'''Restless legs syndrome''' (RLS, or '''Wittmaack-Ekbom's syndrome''') is a condition that is characterised by an irresistible urge to move one's legs. It is poorly understood, often misdiagnosed, and believed to be a [[neurological disorder]]. Many people tap their feet or shake their legs resulting from a nervous tic, consumption of stimulants, drug side-effects or other factors; this is usually innocuous, unnoticed, and does not interfere with daily life, quite distinct from Restless Leg Syndrome.

It is sometimes mistakenly called "Ekbom's syndrome," but that is an entirely different condition that shares part of the Wittmaack-Ekbom syndrome [[List of eponymous diseases|eponym]]: [[delusional parasitosis]], as both syndromes were described by the same person, Karl-Axel Ekbom. <ref name="WhoNamedIt">{{WhoNamedIt|synd|2337|Wittmaack-Ekbom syndrome}}</ref>

== Incidence/Prevalence ==
Many doctors express the view that the incidence of restless leg syndrome is exaggerated by manufacturers of drugs used to treat it.<ref>{{cite journal |author=Woloshin S, Schwartz L |title=Giving legs to restless legs: a case study of how the media helps make people sick |journal=PLoS Med. |volume=3 |issue=4 |pages=e170 |year=2006 |pmid=16597175 |url=http://dx.doi.org/10.1371/journal.pmed.0030170}}</ref>  Other physicians consider it a real entity that has specific diagnostic criteria. <ref>{{cite journal |author=Montplaisir J; Boucher S; Nicolas A; Lesperance P; Gosselin A; Rompré P; Lavigne G |journal=Movement disorders |volume=13 |issue=2 |pages=324-9 |year=1998|pmid=9539348|url=http://www.ncbi.nlm.nih.gov/sites/entrez?db=PubMed&cmd=retrieve&dopt=AbstractPlus&list_uids=9539348}}</ref> 

Restless Leg Syndrome affects an estimated 2.7% of the general population in the U.S.A..<ref name="allen2005">{{cite journal |author=Allen R, Walters A, Montplaisir J, Hening W, Myers A, Bell T, Ferini-Strambi L |title=Restless legs syndrome prevalence and impact: REST general population study |journal=Arch. Intern. Med. |volume=165 |issue=11 |pages=1286-92 |year=2005 |pmid=15956009}}</ref>  

Often sufferers think they are the only ones to be afflicted by this peculiar condition and are relieved when they find out that many others also suffer from it. The severity and frequency of the disorder vary tremendously. Many people only experience symptoms when they try to sleep, while others experience symptoms during the day. It is common to have symptoms on long car rides or during any long period of inactivity (like watching television or a movie, attending a musical or theatrical performance, etc.)  Approximately 80-90% of people with RLS also have PLMD, [[Nocturnal myoclonus|Periodic Limb Movement Disorder]], which causes slow "jerks" or flexions of the affected body part. These occur during sleep (PLMS = Periodic Limb Movement while Sleeping) or while awake (PLMW - Periodic Limb Movement while Waking).  

About 10 percent of adults in North America and Europe may experience RLS symptoms, according to the National Sleep Foundation, which reports that "lower prevalence has been found in India, Japan and Singapore," indicating that ethnic factors, including diet, may play a role in the prevalence of this syndrome.<ref>{{cite web |url=http://www.sleepfoundation.org/site/c.huIXKjM0IxF/b.2417141/k.C60C/Welcome.htm |title=Welcome - National Sleep Foundation |accessdate=2007-07-23 |format= |work=}}</ref>

== History ==
In a 1945 publication titled 'Restless Legs', Karl-Axel Ekbom described the disease and presented eight cases used for his studies.<ref>Ekbom, K.-A. Restless legs: a clinical study. Acta Med. Scand. (Suppl.) 158: 1-123, 1945.</ref>

Earlier studies were done by Thomas Willis (1622-1675) and by Theodor Wittmaack.<ref name="WhoNamedIt"> </ref> Another early description of the disease and its symptoms were made by George Miller Beard (1839-1883).<ref name="WhoNamedIt"> </ref>

== Types ==
RLS is either primary or secondary.  

* Primary RLS is considered [[idiopathic]], or with no known cause. Primary RLS usually begins before approximately 40 to 45 years of age, and can even occur as early as the first year of life.  In primary RLS, the onset is often slow.  The RLS may disappear for months, or even years.  It is often progressive and gets worse as the person ages.  RLS in children is often misdiagnosed as [[growing pains]].

* Secondary RLS often has a sudden onset and may be daily from the very beginning. It often occurs after the age of 40, however it can occur earlier.  It is most associated with specific medical conditions or the use of certain drugs. The most commonly associated medical condition is [[iron deficiency (medicine)|iron deficiency]], which accounts for just over 20% of all cases of RLS.  The conditions include: pregnancy, [[varicose vein]] or venous reflux, [[folate deficiency]], [[sleep apnea]], [[uremia]], [[diabetes mellitus|diabetes]], thyroid problems, peripheral neuropathy, [[Parkinson's disease]] and certain auto-immune disorders such as [[Sjögren's syndrome]], [[Celiac Disease]], and [[rheumatoid arthritis]].  Treatment of the underlying condition, or cessation of use of the offending drug, often eliminates the RLS.

== Causes ==

See potential causal relationship between acidosis and RLS above in "Explanation." Dehydration may also be a cause of an urge to move one's legs, as some sufferers often find that drinking a glass of water may stop the urges for a short while. Certain medications may worsen RLS in those who already have it, or cause it secondarily.  These include: [[anti-nausea drugs]], certain [[antihistamines]] (often in [[Over-the-counter drug|over-the-counter]] cold medications), [[antidepressants|drugs used to treat depression]] (both older [[tricyclics]] and newer [[SSRI]]s), [[antipsychotic]] drugs, and certain medications used to control [[seizures]].

[[Hypoglycemia]] has also been found to worsen RLS symptoms.<ref name="pmid9613772">{{cite journal |author=Kurlan R |title=Postprandial (reactive) hypoglycemia and restless leg syndrome: related neurologic disorders? |journal=Mov. Disord. |volume=13 |issue=3 |pages=619-20 |year=1998 |pmid=9613772 |doi=10.1002/mds.870130349}}</ref> Opioid detoxification has also recently been associated with provocation of RLS-like symptoms during withdrawal. For those affected, a reduction or elimination in the consumption of simple and refined [[carbohydrates]] or [[starches]] (for example, sugar, white flour, white rice and white potatoes) or some hard [[fats]], such as those found in beef or biscuits, is recommended.  

Both primary and secondary RLS can be worsened by surgery of any kind, however [[back surgery]] or injury can be associated with causing RLS.<ref name="pmid15830971">{{cite journal |author=Crotti FM, Carai A, Carai M, Sgaramella E, Sias W |title=Entrapment of crural branches of the common peroneal nerve |journal=Acta Neurochir. Suppl. |volume=92 |issue= |pages=69-70 |year=2005 |pmid=15830971 |doi=}}</ref>  RLS can worsen in [[pregnancy]]. <ref name="pmid3147073">{{cite journal |author=McParland P, Pearce JM |title=Restless leg syndrome in pregnancy |journal=BMJ |volume=297 |issue=6662 |pages=1543 |year=1988 |pmid=3147073 |doi=}}</ref>

===Genetics===
40% of cases of RLS are familial and are inherited in an [[autosomal dominant]] fashion with [[variable penetrance]]. 

No one knows the exact cause of RLS at present.  Research and brain autopsies have implicated both dopaminergic system and iron insufficiency in the [[substantia nigra]] (study published in Neurology, 2003).<ref>{{cite journal | author = Connor J, Boyer P, Menzies S, Dellinger B, Allen R, Ondo W, Earley C | title = Neuropathological examination suggests impaired brain iron acquisition in restless legs syndrome. | journal = Neurology | volume = 61 | issue = 3 | pages = 304-9 | year = 2003 | id = PMID 12913188}}</ref> Iron is an essential cofactor for the formation of L-dopa, the precursor of dopamine.  An Icelandic study in 2005 confirmed the presence of an RLS susceptibility gene also found previously in a smaller French-Canadian population.<ref>{{cite journal | author = Desautels A, Turecki G, Montplaisir J, Sequeira A, Verner A, Rouleau G | title = Identification of a major susceptibility locus for restless legs syndrome on chromosome 12q. | journal = Am J Hum Genet | volume = 69 | issue = 6 | pages = 1266-70 | year = 2001 | id = PMID 11704926}}</ref><ref>{{cite journal | author = Levchenko A, Montplaisir J, Dubé M, Riviere J, St-Onge J, Turecki G, Xiong L, Thibodeau P, Desautels A, Verlaan D, Rouleau G | title = The 14q restless legs syndrome locus in the French Canadian population. | journal = Ann Neurol | volume = 55 | issue = 6 | pages = 887-91 | year = 2004 | id = PMID 15174026}}</ref> Various studies suggest chromosome 12q may indicate susceptibility to RLS.<ref>Christopher J. Earley, M.B., B.Ch., Ph.D., "Restless Legs Syndrome" ''New England J Medicine'' 2003; 348:2103 - 9.</ref>

== Explanation ==

'''Restless Leg Syndrome''' (RLS) (which is also sometimes referred to as [[Nocturnal myoclonus|Jimmy Legs]]) may be described as uncontrollable urges to move the limbs to stop uncomfortable or odd sensations in the body, most commonly in the legs, but can also be in the arms and torso. Moving the affected body part modulates the sensations, providing temporary relief.  

The sensations – and the need to move – may return immediately after ceasing movement, or at a later time. RLS may start at any age, including early childhood, and is a progressive disease for a certain portion of those afflicted, although the symptoms have disappeared permanently in some sufferers.

As with many diseases with diffuse symptoms, there is controversy among physicians, if RLS is a distinct syndrome. The US National Institute of Neurological Diseases and Stroke publishes an information sheet <ref>[http://www.ninds.nih.gov/disorders/restless_legs/detail_restless_legs.htm Restless Legs Syndrome Fact Sheet]</ref> characterizing the syndrome but acknowledging it is a difficult diagnosis. Some physicians doubt that RLS actually exists as a legitimate clinical entity, but believe it to be a kind of "catch-all" category, perhaps related to a general heightened [[sympathetic nervous system]] (SNS) response that could be caused by any number of physical or emotional factors. Other clinicians associate it with lumbosacral spinal subluxations and life stress. Another possible explanation of RLS is acidosis, though this claim needs to be explored further. RLS as a result of acidosis/insufficient oxygen being circulated to the legs (which reduces acid build up) would explain why symptoms worsen when the legs are at rest, and why moving them (increasing circulation) offers some relief. The fact that iron offers relief for many can be explained by its vital role in hemoglobin, which is responsible for oxygen dispersion to the tissues. The legs would be more prone to the restless condition since they are furthest from the heart and lungs. Additionally, one may see below that many of the "lifestyle changes and other non-medicinal approaches" are related in some way or form to circulation (e.g. heat, stretching, movement), acid build up (e.g. too much exercise, ketosis from high-fat diets), or the amount of oxygen being dispersed in the blood (e.g. deep breathing, iron levels). It should be noted that this potential causal relationship between RLS and acidosis is purely speculative the time being, as far as the contributing editor is aware. If this causal relationship holds true, then finding the cause of the acidosis would most likely lead to the best treatment.

Some experts believe RLS and periodic limb movement disorder are strongly associated with ADHD in some children. Both conditions are hereditary and dopamine is believed to be involved. Many types of medication for both conditions are affecting the dopamine levels in the brain [http://www.umm.edu/patiented/articles/other_disorders_associated_with_attention-deficit_disorder_000030_5.htm]

==Diagnosis==

=== Symptoms ===

*"An urge to move, usually due to uncomfortable sensations that occur primarily in the legs."  
The sensations are unusual and unlike other common sensations, and those with RLS have a hard time describing them. People use words such as: uncomfortable, antsy, electrical, creeping, painful, itching, pins and needles, pulling, creepy-crawly, ants inside the legs, and many others. The sensation and the urge can occur in any body part; the most cited location is legs, followed by arms. Some people have little or no sensation, yet still have a strong urge to move. 

*"Motor restlessness, expressed as activity, that relieves the urge to move."  

Movement will usually bring immediate relief, however, often only temporary and partial. Walking is most common; however, doing stretches, yoga, biking, or other physical activity may relieve the symptoms. Constant and fast up-and-down movement of the leg, coined "sewing machine legs" by at least one RLS sufferer, is often done to keep the sensations at bay without having to walk. Sometimes a specific type of movement will help a person more than another.    

*"Worsening of symptoms by relaxation."  

Any type of inactivity involving sitting or lying – reading a book, a plane ride, watching TV or a movie, taking a nap - can trigger the sensations and urge to move. This depends on several factors: the severity of the person’s RLS, the degree of restfulness, the duration of the inactivity, etc.  

*"Variability over the course of the day-night cycle, with symptoms worse in the evening and early in the night." 

While some only experience RLS at bedtime and others experience it throughout the day and night, most sufferers experience the worst symptoms in the evening and the least in the morning.

===NIH criteria===
In 2003, a National Institutes of Health (NIH) consensus panel modified their criteria to include the following: 
* (1) an urge to move the limbs with or without sensations
* (2) worsening at rest
* (3) improvement with activity
* (4) worsening in the evening or night.<ref>{{cite journal | author = Allen R, Picchietti D, Hening W, Trenkwalder C, Walters A, Montplaisi J | title = Restless legs syndrome: diagnostic criteria, special considerations, and epidemiology. A report from the restless legs syndrome diagnosis and epidemiology workshop at the National Institutes of Health. | journal = Sleep Med | volume = 4 | issue = 2 | pages = 101-19 | year = 2003 | id = PMID 14592341}}</ref>

== Differential Diagnosis == 
*Chronic insomnia
*[[Deep Vein Thrombosis]]
*Delayed Deep Sleep Disorder
*[[Hyperthyroidism]]
*Peripheral neuropathy
*[[Peripheral Vascular Disease]]
*Sleep disturbance due to medications
*Vertebral disc disease

== Treatment ==
See potential causal relationship between acidosis and RLS above in "Explanation." An algorithm for treating Primary RLS ( RLS without any secondary medical condition including [[Iron deficiency (medicine)|iron deficiency]], [[varicose vein]], [[thyroid]], etc.) was created by leading RLS researchers at the [[Mayo Clinic]] and is endorsed by the Restless Legs Syndrome Foundation. This document provides guidance to both the treating physician and the patient, and includes both nonpharmacological and pharmacological treatments.<ref name="MayoAlgo">[http://www.mayoclinicproceedings.com/inside.asp?AID=1698&UID Mayo Clinic Algorithm] also available [http://www.mayoclinicproceedings.com/pdf/7907/7907crc.pdf as .pdf]</ref> Treatment of primary RLS should not be considered unless all the secondary medical conditions are ruled out. Drug therapy in RLS is not curative and is  known to have significant side effects and needs to be considered with caution. The secondary form of RLS has the potential for cure if the  precipitating medical condition ([[iron deficiency]], venous reflux/[[varicose vein]], [[thyroid]], etc.) is managed effectively.

===Iron supplements===
All people with RLS should have their [[ferritin]] levels tested; ferritin levels should be at least 50 mcg for those with RLS.  Oral iron supplements, taken under a doctor's care, can increase ferritin levels.  For some people, increasing ferritin will eliminate or reduce RLS symptoms. A ferritin level of 50 mcg is not sufficient for some sufferers and increasing the level to 80 mcg may greatly reduce symptoms.  However, at least 40% of people will not notice any improvement.  Treatment with IV iron is being tested at the US [[Mayo Clinic]] and [[Johns Hopkins Hospital]].  It is dangerous to take iron supplements without first having ferritin levels tested, as many people with RLS do not have low ferritin and taking iron when it is not called for can cause [[iron overload disorder]], potentially a very dangerous condition.

New results from the first ever double-blind clinical study,<ref>{{cite web |url=http://www.lakartidningen.se/engine.php?articleId=2687 |title=Järninfusioner minskar symtomen vid restless legs |accessdate=2007-07-23 |format= |work=}}</ref> performed at [[Örebro University Hospital]] show that all 29 out of 60 patients that were treated with IV-infusion of up to a total of 1000 mg of iron (in the form of [[iron saccharose]], [[Venofer]]), were markedly improved after 3 weeks. The effect lasted for 5-6 months. Those 31 receiving placebo had just a slight effect after 3 weeks that additionally disappeared rapidly.

The treatment was given even if iron deficiency was not shown according to [[ferritin]] levels. Worries of anaphylactic reactions did not come true. This is probably due to the form the IV iron was given. Anaphylaxis has been associated predominantly with dextran based infusions.

===Lifestyle changes and other non-medicinal approaches===

Treatment for RLS is based on how disruptive the symptoms are. All people should review their lifestyle and see what changes could be made to reduce or eliminate their RLS symptoms.  These include: finding the right level of [[exercise]] (too much worsens it, too little may trigger it); eliminating [[caffeine]], [[tobacco smoking|smoking]], and [[alcohol]]; changing the diet to eliminate foods that trigger RLS (different for each person, but may include eliminating [[sugar]], [[triglycerides]], [[gluten]], sugar substitutes ([[aspartame]]), following a [[low-fat diet]], etc.); keeping good [[sleep hygiene]]; treating conditions that may cause secondary RLS; avoiding or stopping OTC or prescription drugs that trigger RLS; adding supplements such as [[potassium]], [[magnesium]], [[B-12]], [[folate]], [[vitamin E]], and [[calcium]].  Some of these changes, such as diet (particularly aspartame) and adding supplements are based on anecdotal evidence from RLS sufferers as few studies have been done on these alternatives.  

For those who experience RLS infrequently and do not need or want to try medication, in addition to lifestyle changes they can try: 
* some form of exercise for several minutes such as walking, stretching, meditation, [[yoga]], etc. at bedtime
* heat or cold, such as a hot or cold bath, a heating pad, a cold cloth, or a fan
* soaking one's feet in hot water just prior to going to sleep
* engrossing the mind in a game, the [[computer]], or figuring something out
* wearing [[compression stockings]], tight [[pantyhose]], or wrapping the legs in elastic bandages
* placing a pillow between the knees or upper-legs while lying in bed
* eating porridge oats or almonds daily for their magnesium content 
* hot green tea can relieve symptoms
* deep breathing for one or two minutes
* Massage and chiropractic spinal manipulation provide significant relief for some patients.

===Medicinal approaches===
For those whose RLS disrupts or prevents sleep or regular daily activities, medication is often required.  Many Doctors currently use, and the [[Mayo Clinic]] [[Algorithm]] includes,<ref name="MayoAlgo"> </ref> medication from four categories: 

* 1) [[Dopamine agonist]]s such as [[ropinirole]], [[pramipexole]], [[carbidopa]]/[[levodopa]] or [[pergolide]]:

{| class="wikitable"
| '''Agent''' || '''Timeline''' || '''Comments''' 
 |- 
 | [[ropinirole]]  || Approved In 2005 by the Food and Drug Administration to treat moderate to severe Restless Legs Syndrome || The drug was first approved for [[Parkinson's disease]] in 1997.
 |- 
 | [[pramipexole]] (Mirapex, Sifrol, Mirapexen in the EU) || In February 2006, the EU Scientific Committee issued a positive recommendation for approving  for the treatment of RLS in the EU.  US FDA approved Mirapex in 2006. || - 
 |- 
 | [[rotigotine]] || Currently in process for US FDA and EU approval for RLS || Delivered via a transdermal patch
 |- 
 | [[pergolide]] || In March 2007 was withdrawn from the U.S. market || Withdrawn due to implication in [[valvular heart disease]], that was shown in two independent studies.
|}

There are some issues with the use of dopamine augmentation. Dopamine agonists may cause augmentation.  This is a medical condition where the drug itself causes symptoms to increase in severity and/or occur earlier in the day. Dopamine agonists may also cause rebound, when symptoms increase as the drug wears off. Also, a recent study indicated that dopamine agonists used in restless leg patients can lead to an increase in [[compulsive gambling]].<ref>[http://www.mayoclinic.org/news2007-rst/3918.html "Medical Therapy for Restless Legs Syndrome may Trigger Compulsive Gambling", Mayo Clinic in Rochester, February 08, 2007]</ref>

* 2) [[Opioid]]s such as [[propoxyphene]], [[oxycodone]], or [[methadone]], etc.
* 3) [[Benzodiazepine]]s, which often assist in staying asleep and reducing awakenings from the movements
* 4) [[Anticonvulsant]]s, which often help people who experience the RLS sensations as painful, such as [[gabapentin]]

In a study of 10 patients, it was reported that partial relief with taking a supplemental magnesium salt<ref name="pmid9703590">{{cite journal |author=Hornyak M, Voderholzer U, Hohagen F, Berger M, Riemann D |title=Magnesium therapy for periodic leg movements-related insomnia and restless legs syndrome: an open pilot study |journal=Sleep |volume=21 |issue=5 |pages=501-5 |year=1998 |pmid=9703590 |doi=}}</ref> such as '''[[magnesium oxide]]''' or [[magnesium gluconate]] once or twice a day, and reducing the dose if [[diarrhea]] develops. Magnesium sulfate is the most active form; however, magnesium supplementation can cause complications for patients with renal problems.<ref>{{cite web |url=http://www.mayoclinic.com/health/drug-information/DR202644 |title=Magnesium Supplements (Systemic) - MayoClinic.com |accessdate=2007-08-08 |format= |work=}}</ref>

== Controversies ==

<!--Please do NOT remove this section. Discuss it on the talk page before making major edits. (however, this section does need to be re-worded to reflect a more neutral POV)-->

Recently, several major pharmaceutical companies are reported to be marketing drugs without an explicit approval for RLS, which are "off-label" applications for drugs approved for other diseases.   The Restless Leg Foundation <ref>* [http://www.rls.org/NETCOMMUNITY/Page.aspx?&pid=471&srcid=-2 RLS Foundation]</ref> received 44% of its $1.4 million in funding from these pharmaceutical groups<ref>[http://www.newscientist.com/channel/health/mg19225755.100-patient-groups-special-swallowing-the-best-advice.html Marshall, Jessica, and Peter Aldhous. "Patient Groups Special."  New Scientist, 10/26/06]</ref>. This has called into question the neutrality of this group (significant conflict of interest issue) and the course of action which they recommend to RLS patients.

==See also ==
*[[Actigraphy]]
*[[Parasomnia]]
*[[Disease mongering]]

==References==
{{Reflist|2}}

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