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Excessive fragmentary myoclonus on polysomnography

Excessive fragmentary myoclonus on polysomnography
This figure shows a 30-second epoch of a PSG in a patient with excessive fragmentary myoclonus (dashed box). Each burst is at least 150 milliseconds long, and there are at least five EMG bursts per minute. Excessive fragmentary myoclonus is typically evident during NREM sleep.
EOG: electrooculography; EEG: electroencephalography; EMG: electromyography; ECG: electrocardiography; PSG: polysomnography; NREM: non-rapid eye movement.
Illustrated by Seulah Rebecca Choi. Reproduced with permission.
Graphic 104854 Version 2.0