Motor Activated Auricular Vagus Nerve Stimulation as a Potential Neuromodulation Approach for Post-Stroke Motor Rehabilitation: A Pilot Study.
Bashar W Badran, Xiaolong Peng, Brenna Baker-Vogel and 10 others
PMID 37209010WHAT IT FOUND
Pairing ear stimulation with movement did not beat unpaired stimulation for stroke arm recovery.
Both groups improved similarly. The trial was too small to prove which method works better, so do not change your practice based on this pilot alone.
Key findings
01There was no significant difference in motor function improvement between the paired stimulation group and the unpaired stimulation group.
02Both groups showed significant improvement in arm function from baseline to the end of the 12-session program.
03The study was not powered to detect efficacy differences, and the authors note that 97 patients would be needed to determine if one method is superior.
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 study was a pilot with a very small sample size (16 participants analyzed), which means it was not designed or powered to prove that one treatment is better than the other. There was no true sham control; both groups received active stimulation, making it difficult to determine if the stimulation itself provided any benefit over the motor training alone. Three participants were excluded from analysis, and one dropped out, reducing the statistical power further. The trial did not control for stroke type or lesion size, which can significantly affect recovery potential.
Declared interests
Research support from the U.S. Government (Non-P.H.S.) and N.I.H. (Extramural) was reported in the publication types.
The easy way to misread this
Do not interpret the larger effect size in the paired group as proof that it works better. The study was underpowered, and the primary comparison showed no significant difference between the groups.