Fragmentary myoclonus in idiopathic rapid eye movement sleep behavior disorder

Introduction and Objectives: Fragmentary myoclonus (FM) is the manifestation of muscle activity characterized by brief asynchronous potentials, registered by the surface EMG during polysomnography. Excessive fragmentary myoclonus (EFM) is the form of FM, defined by pathologically increased presence of these potentials at the polysomnographic recording.

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