It is typically symmetrical, and affects the arms, hands, or fingers but sometimes involves the head, vocal cords, or other body parts. The spiral on the left was drawn by the subject using the left hand, and the one on the right using the right hand.įamily history, exposure to particular toxins Ĭerebellar tremor, dystonic tremor, multiple sclerosis, Parkinson's disease īeta blockers, primidone, anti-epileptics, topiramate, gabapentin, levetiracetam, benzodiazepines Īnnual incidence of 23.7 per 100,000 (2010) Įssential tremor ( ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations ( oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause.
Archimedean spiral drawings from a man with a unilateral essential tremor.
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