Long‐term follow‐up of task‐specific tremor after thalamotomy: a retrospective observational study

Abstract Objective This study aimed to report the long‐term results of thalamotomy in 23 patients with task‐specific tremor. Methods Data of 23 patients with task‐specific tremor who underwent ventralis intermedius nucleus and posterior part of ventro‐oral nucleus thalamotomy at the Tokyo Women's Medical University Hospital between 2010 and 2022 were retrospectively analyzed. To evaluate neurological conditions, the severity of task‐specific tremor was divided into 0 (no tremor), 1 (slightly tremulous), 2 (moderately tremulous), 3 (accomplishing tasks with great difficulty), and 4 (unable to complete tasks). We also used the subscores “handwriting” (0–4) and “spiral drawing” (0–4) of the Clinical Rating Scales for Tremor. Evaluation scales were presented as medians and interquartile ranges. Results The severities of task‐specific tremor were 3.0 (3.0–4.0) preoperatively and 0.0 (0.0–0.0, p