Bilateral subthalamic stimulation for advanced Parkinson disease: early experience at an Eastern center.

Deep brain stimulation (DBS) of the subthalamic nucleus (STN) can improve the life quality of patients with advanced Parkinson disease (PD). However, previous studies have stemmed mainly from Western centers. Present study analyzed the 6-month outcomes of bilateral STN-DBS therapy that were observed during a 9-year period at a Taiwanese institute. We retrospectively reviewed 72 consecutive patients, whose mean disease history was 8 years when they underwent surgery. The median "drug-off" Hoehn and Yahr stage was 3. The STN was targeted using T2-weighted magnetic resonance imaging and electrophysiological guidance. The over-time mean differences in the Unified PD Rating Scale (UPDRS) scores and daily levodopa-equivalent dose (LED) were assessed using the repeated measurements ANOVA at 3 and 6 months relative to those of presurgical drug-off baseline. At 6 months postsurgery, the mean UPDRS total, Part II and Part III subscores significantly decreased by 27, 30 and 25 %, respectively, with clinically high effect size. Tremors were markedly (66 %) ameliorated. Moreover, problems of akinesia, rigidity, and locomotion were significantly improved by 20 %. The mean daily LED needs decreased by 25 %; thus, drug-induced dyskinesia was markedly (80 %) diminished. STN-DBS therapy could provide similarly effective impacts to Eastern and Western PD patients. Preoperative optimal selection of patients and postoperative delicate programming ensure a better surgical improvement.