Effect of stimulation frequency on tremor suppression in essential tremor

Mwiza Ushe, Jonathan W. Mink, Fredy J. Revilla, Angie Wernle, Patricia Schneider Gibson, Lori McGee-Minnich, Minna Hong, Keith M. Rich, Kelly E. Lyons, Rajesh Pahwa, Joel S. Perlmutter

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

We sought to determine the effect of deep brain stimulation (DBS) frequency on tremor suppression in essential tremor (ET) patients with deep brain stimulators implanted in the ventral intermediate nucleus (VIM) of the thalamus. A uniaxial accelerometer was used to measure tremor in the right upper extremity of subjects with a diagnosis of ET who had DBS electrodes implanted in the left VIM. The root-mean-square acceleration was used as the index of tremor magnitude and normalized to the OFF DBS condition. There was a highly significant inverse sigmoidal relationship between stimulation frequency and normalized tremor acceleration (X2/DoF = 0.42, r2 = 0.997). Tremor acceleration had a nearly linear response to stimulation frequencies between 45 and 100 Hz with little additional benefit above 100 Hz. These findings have two important implications. Clinically, frequency of thalamic stimulation is an important variable for optimal tremor control with maximal benefit achieved with 100 to 130 Hz in most patients. Second, thalamic DBS provides tremor benefit in a graded manner and is not an all-or-nothing phenomenon.

Original languageEnglish
Pages (from-to)1163-1168
Number of pages6
JournalMovement Disorders
Volume19
Issue number10
DOIs
StatePublished - Oct 2004

Keywords

  • Deep brain stimulation
  • Kinematics
  • PET
  • Tremor

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