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In this Article

• Introduction to periodic limb movement disorder
• What causes periodic limb movement disorder?
• What are the symptoms of periodic limb movement disorder?
• How is periodic limb movement disorder diagnosed?
• How is periodic limb movement disorder treated?
• What should someone with periodic limb movement disorder avoid?
• Find a local Neurologist in your town
• Periodic Limb Movement Disorder Index

The causes of PLMD are unknown. However recent research has shown that people with a variety of medical problems, including Parkinson's disease and narcolepsy, may have frequent periodic limb movements in sleep.

PLMD may be caused by medications, most notably, antidepressants.

Symptoms of PLMD are usually leg movements with the extension of the big toe in combination with a partial flexing of the ankle, knee, or hip. Movement of the legs is more typical than movement of the arms. It can often cause a partial or full brief awakening resulting in fragmented sleep. Patients are frequently unaware of these movements.

A sleep partner may observe PLMD, which often affect the partner before the patient knows of his or her behavior. In other cases, the diagnosis is made on an overnight polysomnogram (a test that records bodily functions during sleep). This test is often used to assess the cause of daytime sleepiness or recurrent awakenings from sleep. Blood work may be done in order to test iron status, folic acid, vitamin B12, thyroid function, and magnesium levels.

Generally, there are several classes of drugs that are used to treat PLMD. These include the Parkinson's disease drugs, anticonvulsant medications, benzodiazepines, and narcotics. Current treatment recommendations consider the anti-Parkinson's medications as a first line of defense. Medical treatment of PLMD often significantly reduces or eliminates the symptoms of these disorders.

There is no cure for PLMD and medical treatment must be continued to provide relief.

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