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EHS

Teaching Video NeuroImages: Propriospinal myoclonus as a sequela of Guillain-Barre syndrome

A previously healthy 27-year-old woman developed Guillain-Barré syndrome (GBS) with severe tetraplegia, requiring immunoglobulins. During remission, nonrhythmic, stimulus-sensitive abdominal jerks, propagating to the hips, appeared, worsening in supine position. Surface EMG confirmed propriospinal myoclonus (PSM)1 originating from Th8 (figure 1 and video). Myoclonus ceased with levetiracetam. Normal backward averaging, somatosensory evoked potentials, and absent Bereitschaftspotential argued against cortical or functional origins.

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