1. PLMS
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2. Periodic Limb Movement Disorder

3. Sample PLMS
LAT
RAT

4. Sample PLMS

5. Scoring PLMS Each jerk must be >.5 to 10 seconds in duration
Each jerk must represent an 8uV increase in amplitude above resting EMG
Must have 4 jerks separated by no less than 5 seconds and no more than 90 seconds

8. Chin EMG may decrease prior to jerk
LOC
ROC
C3-A2
O1-A2
Chin EMG
EKG
LAT-RAT
EMG
Intercostal EMG
Airflow
Significant only when accompanied by EEG arousal
Chin EMG may decrease prior to jerk
Jerks may last
from .5 to 5
seconds
Single PLMS jerk

9. Calculations
Total number of qualifiable events divided by the total hours of sleep (TST)