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Article Abstract
Background: Essential tremor (ET) is the most common adult movement disorder. For the relatively large group of patients who do not respond adequately to pharmacological therapy, deep brain stimulation (DBS) is a well-established treatment option. Most ET patients will have bilateral symptoms, and many of them receive bilateral DBS. Unilateral DBS is however still the most common procedure, and some papers suggest an ipsilateral effect in these patients.
Objectives: The aim of this study was to analyze if there is an ipsilateral effect of DBS for ET.
Method: We retrospectively analyzed our patient cohort with DBS surgery from 1996 to 2017, selecting patients with ET that underwent surgery with unilateral DBS without previous DBS or lesional surgery. A total number of 68 patients (39 males, 29 females) were identified. The patients were evaluated twice: first, at a mean time of 12 months after surgery defined as short-term follow-up and then again at a mean time of 49 months after surgery defined as long-term follow-up, using the clinical rating scale for tremor (CRST).
Results: The total CRST score was reduced from mean 49.5 points at baseline before surgery to 20.2 (p < 0.001) at short-term and 28.3 (p < 0.001) at long-term follow-up. Contralateral tremor was reduced from mean 6.1 to 0.4 (p < 0.001) and 1.2 (p < 0.001), respectively. Contralateral hand function was reduced from 11.5 to 2.6 (p < 0.001) and 4.6 (p < 0.001), respectively. Ipsilateral hand function scored 9 at baseline, 8.3 at 1 year, and then again 9.4 at long-term follow-up. Ipsilateral tremor scored 4.0 at baseline, 3.7 at 1 year, and 4.3 at long-term follow-up. Neither ipsilateral hand function nor ipsilateral tremor showed significant difference.
Conclusions: There was no difference in severity of ipsilateral tremor, neither at 1 year nor in the long term. We believe ipsilateral effects of DBS for ET merits limited consideration regarding decision-making or patient counseling before surgery.
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