Sign Up for a Free Account

This is an image preview.
Start a Free Account
to view the full image.

Sign Up for a Free Account For information on discounts, see Plans & Pricing

  • Nearly 3,000 illustrations, including video clips of neurologic disorders.

  • Every article is reviewed by our esteemed Editorial Board for accuracy and currency.

  • Full spectrum of neurology in 1,200 comprehensive articles.

  • Listen to MedLink on the go with Audio versions of each article.

Periodic limb movements in sleep (polysomnogram)

Periodic limb movements are repetitive movements of the legs, sometimes of the arms, occurring at 5- to 90-second intervals, often associated with arousals that reduce the quality of nocturnal sleep. The figure shows periodic limb movements on polysomnogram. C3-A1, C4-A2, and O1-O2 = electroencephalogram channels; L EOG and R EOG = electrooculogram channels; EMG Subm. and EMG Tib. = electromyogram channels to record submental and tibialis muscle activity; Oral/Nasal = air flow; Chest = thoracic excursions; Abd. = abdominal movements; Oxim. = hemoglobin saturation of oxygen. (Contributed by Dr. Antonio Culebras.)

Related Article