Preventing slowing down of alpha rhythms in stroke patients through modulation of cortical excitatory-inhibitory balance: a randomized controlled trial.
Francisco Páscoa Dos Santos, Javier de la Torre Costa, Martina Maier and 8 others
PMID 41703634WHAT IT FOUND
Adding bilateral tDCS to virtual reality upper-limb training helped stroke patients keep improving for 12 weeks after discharge, while the sham group stalled.
However, this benefit came from the combination with standard rehab, and the mechanism was not the predicted change in brain rhythms.
Key findings
01Patients receiving tDCS alongside VR training showed significant continued improvement in motor function, bimanual activity, and daily living independence from end of treatment to 12-week follow-up, whereas the sham group did not.
02tDCS prevented the slowing of alpha brain rhythms observed in the sham group, but these brain rhythm changes did not correlate with the degree of clinical recovery.
03The clinical benefit was driven by the combination of tDCS and VR training; both groups improved equally during the active treatment phase, with the difference emerging only after discharge.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The sample size was very small (22 patients), which limits the reliability of the findings and increases the risk of false positives or exaggerated effects. The clinical assessment only went up to 12 weeks post-baseline, so it is unknown if the benefits persist longer. The study design cannot separate the effect of tDCS from the effect of the VR training; the benefit is attributed to the combination. The mechanism of action remains unclear, as the observed EEG changes did not correlate with clinical outcomes. The CAHAI scale measures bimanual tasks, which may reflect compensation with the unaffected limb rather than true recovery of the impaired limb.
Declared interests
Funded by H2020 Marie Skłodowska-Curie Actions, EIT Health, Horizon 2020 Framework Programme, HORIZON EUROPE European Research Council, and HORIZON EUROPE European Innovation Council.
The easy way to misread this
Do not interpret this as evidence that tDCS alone improves stroke recovery. The benefit was seen only when tDCS was combined with intensive VR training and standard rehab, and the small sample size means these results require confirmation in larger trials before changing practice.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →