Polysomnography shows repetitive, highly stereotyped limb movements that are: |
- 0.5 to 10 seconds in duration,
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- Minimum amplitude of 8 mV above resting EMG,
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- In a sequence of 4 or more movements, and
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- Separated by an interval of more than 5 seconds (from limb movement onset to limb movement onset) and less than 90 seconds
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The PLMS index is ≥5/hour in pediatric cases and ≥15/hour in adult cases |
PLMS cause clinical sleep disturbance (difficulty with sleep initiation, sleep maintenance, and/or unrefreshing sleep) or impaired daytime function* |
The PLMS are not better explained by another current sleep disorder¶, medical or neurologic disorder, mental disorder, medication use, or substance use disorder (eg, exclude from PLMS counts the movements at the termination of cyclically occurring apneas) |