Sleep medicine · 2002
Excessive fragmentary hypnic myoclonus: clinical and neurophysiological findings.
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Vetrugno Roberto, Plazzi Giuseppe, Provini Federica, Liguori Rocco, Lugaresi Elio, Montagna Pasquale
Аннотация
BACKGROUND: Brief involuntary sleep-related twitches occurring asymmetrically throughout the body define physiologic hypnic fragmentary myoclonus. An abnormal intensification of this entity identifies excessive fragmentary hypnic myoclonus (EFHM), a 'proposed sleep disorder' in the International Sleep Disorders Classification.
METHODS: We describe two patients with EFHM, one associated with a REM behaviour disorder.
RESULTS: EFHM activity was restricted to sleep prevailing during NREM sleep stages and the second part of the night. EMG was normal and EEG-EMG back-averaging did not show any cortical potentials related to the twitches.
CONCLUSIONS: EFHM represents a pathological phenomenon which may or may not be associated with other sleep disorders. A brainstem generator explains its distribution throughout the body and the sleep stages.
METHODS: We describe two patients with EFHM, one associated with a REM behaviour disorder.
RESULTS: EFHM activity was restricted to sleep prevailing during NREM sleep stages and the second part of the night. EMG was normal and EEG-EMG back-averaging did not show any cortical potentials related to the twitches.
CONCLUSIONS: EFHM represents a pathological phenomenon which may or may not be associated with other sleep disorders. A brainstem generator explains its distribution throughout the body and the sleep stages.