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. 2013 Dec 12;30(1):153–161. doi: 10.1007/s12264-013-1389-9

Influence of deep brain stimulation of the subthalamic nucleus on cognitive function in patients with Parkinson’s disease

Bin Wu 1, Lu Han 1, Bo-Min Sun 2, Xiao-Wu Hu 3, Xiao-Ping Wang 1,✉
PMCID: PMC5562574  PMID: 24338433

Abstract

Deep brain stimulation (DBS) is an effective technique for treating Parkinson’s disease (PD) in the middle and advanced stages. The subthalamic nucleus (STN) is the most common target for clinical treatment using DBS. While STN-DBS can significantly improve motor symptoms in PD patients, adverse cognitive effects have also been reported. The specific effects of STN-DBS on cognitive function and the related mechanisms remain unclear. Thus, it is imperative to identify the influence of STN-DBS on cognition and investigate the potential mechanisms to provide a clearer view of the various cognitive sequelae in PD patients. For this review, a literature search was performed using the following inclusion criteria: (1) at least 10 patients followed for a mean of at least 6 months after surgery since the year 2006; (2) pre- and postoperative cognitive data using at least one standardized neuropsychological scale; and (3) adequate reporting of study results using means and standard deviations. Of ∼170 clinical studies identified, 25 cohort studies (including 15 self-controlled studies, nine intergroup controlled studies, and one multi-center, randomized control experiment) and one metaanalysis were eligible for inclusion. The results suggest that the precise mechanism of the changes in cognitive function after STN-DBS remains obscure, but STN-DBS certainly has effects on cognition. In particular, a progressive decrease in verbal fluency after STN-DBS is consistently reported and although executive function is unchanged in the intermediate stage postoperatively, it tends to decline in the early and later stages. However, these changes do not affect the improvements in quality of life. STN-DBS seems to be safe with respect to cognitive effects in carefully-selected patients during a follow-up period from 6 months to 9 years.

Keywords: Parkinson’s disease, subthalamic nucleus, deep brain stimulation, cognitive function, mechanism

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