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Neural Plasticity
Volume 2017, Article ID 2758097, 12 pages
https://doi.org/10.1155/2017/2758097
Review Article

Low-Frequency Repetitive Transcranial Magnetic Stimulation for Stroke-Induced Upper Limb Motor Deficit: A Meta-Analysis

1Department of Imaging & Imaging Institute of Rehabilitation and Development of Brain Function, The Second Clinical Medical College of North Sichuan Medical College, Nanchong Central Hospital, Nanchong 637000, China
2Department of Radiology, Langzhong People’s Hospital, Nanchong 637000, China
3Lotus Biotech.com LLC., John Hopkins University-MCC, Rockville, MD 20850, USA
4North Sichuan Medical College, Nanchong 637000, China
5Peking University Third Hospital, Beijing 100080, China

Correspondence should be addressed to Qiwen Mu; moc.oohay@99newiqum

Received 19 July 2017; Accepted 1 October 2017; Published 21 December 2017

Academic Editor: Andrea Turolla

Copyright © 2017 Lan Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background and Purpose. This meta-analysis aimed to evaluate the therapeutic potential of low-frequency repetitive transcranial magnetic stimulation (LF-rTMS) over the contralesional hemisphere on upper limb motor recovery and cortex plasticity after stroke. Methods. Databases of PubMed, Medline, ScienceDirect, Cochrane, and Embase were searched for randomized controlled trials published before Jun 31, 2017. The effect size was evaluated by using the standardized mean difference (SMD) and a 95% confidence interval (CI). Resting motor threshold (rMT) and motor-evoked potential (MEP) were also examined. Results. Twenty-two studies of 1 Hz LF-rTMS over the contralesional hemisphere were included. Significant efficacy was found on finger flexibility (SMD = 0.75), hand strength (SMD = 0.49), and activity dexterity (SMD = 0.32), but not on body function (SMD = 0.29). The positive changes of rMT (SMD = 0.38 for the affected hemisphere and SMD = −0.83 for the unaffected hemisphere) and MEP (SMD = −1.00 for the affected hemisphere and SMD = 0.57 for the unaffected hemisphere) were also significant. Conclusions. LF-rTMS as an add-on therapy significantly improved upper limb functional recovery especially the hand after stroke, probably through rebalanced cortical excitability of both hemispheres. Future studies should determine if LF-rTMS alone or in conjunction with practice/training would be more effective. Clinical Trial Registration Information. This trial is registered with unique identifier CRD42016042181.