Cognitive effects and acceptability of non-invasive brain stimulation on Alzheimer's disease and mild cognitive impairment: A component network meta-analysis

Che Sheng Chu, Cheng Ta Li, Andre R. Brunoni, Fu Chi Yang, Ping Tao Tseng, Yu Kang Tu, Brendon Stubbs, André F. Carvalho, Trevor Thompson, Tarek K. Rajji, Ta Chuan Yeh, Chia Kuang Tsai, Tien Yu Chen, Dian Jeng Li, Chih Wei Hsu, Yi Cheng Wu, Chia Ling Yu, Chih Sung Liang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

90 Scopus citations

Abstract

Objectives To compare cognitive effects and acceptability of repetitive transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS) in patients with Alzheimer's disease (AD) or mild cognitive impairment (MCI), and to determine whether cognitive training (CT) during rTMS or tDCS provides additional benefits. Methods Electronic search of PubMed, Medline, Embase, the Cochrane Library and PsycINFO up to 5 March 2020. We enrolled double-blind, randomised controlled trials (RCTs). The primary outcomes were acceptability and pre-post treatment changes in general cognition measured by Mini-Mental State Examination, and the secondary outcomes were memory function, verbal fluency, working memory and executive function. Durability of cognitive benefits (1, 2 and ≥3 months) after brain stimulation was examined. Results We included 27 RCTs (n=1070), and the treatment components included high-frequency rTMS (HFrTMS) and low-frequency rTMS, anodal tDCS (atDCS) and cathodal tDCS (ctDCS), CT, sham CT and sham brain stimulation. Risk of bias of evidence in each domain was low (range: 0%-11.1%). HFrTMS (1.08, 9, 0.35-1.80) and atDCS (0.56, 0.03-1.09) had short-term positive effects on general cognition. CT might be associated with negative effects on general cognition (-0.79,-2.06 to 0.48) during rTMS or tDCS. At 1-month follow-up, HFrTMS (1.65, 0.77-2.54) and ctDCS (2.57, 0.20-4.95) exhibited larger therapeutic responses. Separate analysis of populations with pure AD and MCI revealed positive effects only in individuals with AD. rTMS and tDCS were well tolerated. Conclusions HFrTMS is more effective than atDCS for improving global cognition, and patients with AD may have better responses to rTMS and tDCS than MCI.

Original languageEnglish
Pages (from-to)195-203
Number of pages9
JournalJournal of Neurology, Neurosurgery and Psychiatry
Volume92
Issue number2
DOIs
StatePublished - 01 02 2021

Bibliographical note

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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