Restless legs syndrome classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mohamadmostafa Jahansouz M.D.[2]

Classification

• Restless leg syndrome (RLS), may be classified into two groups:
  • Primary and secondary:
    • Primary RLS is idiopathic and the cause of that is unknown which is familial in up to two thirds of patients. 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.
    • Secondary RLS may also be secondary to a number of conditions including:
    • iron deficiency, pregnancy and end-stage renal failure and, perhaps, neuropathy. Secondary RLS is most common in those presenting for the first time in later life

OR

• [Disease name] may be classified into [large number > 6] subtypes based on:
  • [Classification method 1]
  • [Classification method 2]
  • [Classification method 3]
• [Disease name] may be classified into several subtypes based on:
  • [Classification method 1]
  • [Classification method 2]
  • [Classification method 3]

OR

• Based on the duration of symptoms, [disease name] may be classified as either acute or chronic.

OR

• If the staging system involves specific and characteristic findings and features:
• According to the [staging system + reference], there are [number] stages of [malignancy name] based on the [finding1], [finding2], and [finding3]. Each stage is assigned a [letter/number1] and a [letter/number2] that designate the [feature1] and [feature2].

OR

• The staging of [malignancy name] is based on the [staging system].

OR

• There is no established system for the staging of [malignancy name].

Classification

RLS is either primary or secondary.

Secondary

• 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, 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, 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.