Criteria
Movement Disorder Society on tremors[4]
Essential tremor (ET):
Isolated tremor syndrome of bilateral upper limb action tremor
At least 3 years’ duration
With or without tremor in other locations (e.g., head, voice, or lower limbs)
Absence of other neurological signs, such as dystonia, ataxia, or parkinsonism.
Essential tremor plus:
Tremor with the characteristics of ET and additional neurologic signs of uncertain significance such as impaired tandem gait, questionable dystonic posturing, memory impairment, or other mild neurologic signs of unknown significance that do not suffice to make an additional syndrome classification or diagnosis.
ET with tremor at rest should be classified here.
Exclusion criteria for ET and ET plus:
Isolated focal tremors (voice, head)
Orthostatic tremor with a frequency >12 Hz
Task- and position-specific tremors
Sudden onset and stepwise deterioration.
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