August 24, 2010 — A novel sporadic prion protein disease, variably protease-sensitive prionopathy (VPSPr), with distinct features has been described as the first new prion disease since sporadic ...

Myoclonus is a sudden, random muscle jerk. It can happen alone or stem from a medical condition. Possible causes include medication side effects, damage to the nervous system, and disorders that ...

Sleep myoclonus is involuntary, nonrhythmic muscle twitching that occurs either as a person falls asleep or during sleep. The movements include hiccups, starts, and jerks. Sleep myoclonus is not a ...