Table 1

Essential Tremor Rating Scale scores for 18 patients evaluated separately for each of the 20 electrodes before surgery and off-/on-stimulation at 1 year and at the final evaluation after 3–5 years (mean 48.5 months)

ItemMaximum scorePreop1 year stimulation3–5 years stimulation
OffOnOffOn
Sum ETRS (items 1–21)14446.0±8.738.7±4.8*17.6±8.2 §45.1±16.021.9±10.0 §
Part A (items 1–9)8013.5±3.710.6±4.8*5.1±3.1 §13.0±5.46.9±3.9 §
 Voice tremor (item 3)40.3±0.50.1±0.20.1±0.20.5±0.90.2±0.4
 Head tremor (item 4)80.4±0.70.2±0.50.1±0.30.2±0.70.1±0.4
 Tremor of upper extremity
  Ipsilateral to DBS124.4±2.14.7±2.74.2±2.55.2±2.24.5±2.5
  Contralateral to DBS126.1±1.85.1±2.0*0.2±0.5 §4.7±2.3*0.5±0.8 §
   Rest40.4±0.80.6±0.80.0±0.0* 0.4±0.60.0±0.0 §
   Postural42.4±0.91.4±0.9*0.1±0.2 §1.5±0.8*0.1±0.2 §
   Action/intention43.4±1.03.2±0.90.2±0.4 §2.9±1.30.5±0.6 §
Hand function (items 11–14)3217.2±4.815.2±6.58.3±4.2 §18.5±7.110.5±5.2 §
 Contralateral to DBS169.1±3.27.4±3.60.9±1.0 §9.3±4.62.0±2.1 §
 Ipsilateral to DBS167.6±3.37.9±3.87.5±3.68.9±3.78.6±3.8
ADL (items 15–21)2811.7±2.711.2±4.64.2±4.9 §12.4±5.44.0±3.0 §
  • Values are the mean±SD.

  • * p≤0.05 versus baseline.

  • p≤0.001 versus baseline.

  • p≤0.05 versus off-stimulation.

  • § p≤0.001 versus off-stimulation.

  • p≤0.05, significant increase since the 1 year of follow-up.

  • ADL, activities of daily living; DBS, deep brain stimulation; ETRS, Essential Tremor Rating Scale.