Applications of Repetitive Transcranial Magnetic Stimulation to Improve Upper Limb Motor Performance After Stroke: A Systematic Review.
Afifa Safdar, Marie-Claire Smith, Winston D Byblow and 1 others
PMID 37947106WHAT IT FOUND
Most stroke rTMS trials still suppress the unaffected hemisphere, but this often fails to improve motor function.
Evidence suggests matching the stimulation to the patient's specific nerve damage is critical, as suppressing the unaffected side can worsen outcomes in severely impaired patients.
Key findings
01The vast majority of included studies (67%) applied rTMS to suppress the contralesional hemisphere alone or in combination with ipsilesional facilitation, reflecting a continued reliance on the interhemispheric competition model.
02Trials that directly facilitated the ipsilesional hemisphere in patients with intact motor pathways (MEP+) consistently reported positive results, whereas those that only suppressed the contralesional hemisphere produced equivocal outcomes.
03Facilitating the contralesional hemisphere may benefit severely impaired patients who lack ipsilesional pathway integrity, but only two studies in the review tested this approach.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The review searched only one database (PubMed), which may have missed relevant studies. It excluded studies that facilitated the ipsilesional hemisphere alone, focusing only on those targeting the contralesional hemisphere. Most included studies had small sample sizes (median 20 participants). Almost half of the studies did not verify if the rTMS actually changed brain excitability, undermining confidence in the reported effects. The review did not perform a meta-analysis of efficacy, so it describes patterns of application rather than quantifying treatment effects.
Declared interests
The authors declared no potential conflicts of interest. One author received a doctoral scholarship from the University of Auckland; other authors received no financial support.
The easy way to misread this
Do not conclude that rTMS is ineffective for stroke rehabilitation. The mixed results likely stem from applying a uniform protocol to patients with different underlying neural damage. Suppressing the unaffected hemisphere may harm severely impaired patients who rely on it for compensation, so the lack of benefit in some studies reflects a mismatch between the intervention and the patient's physiology, not a failure of the technology itself.