Closed-loop movement-paired transcutaneous auricular vagus nerve stimulation for upper-limb rehabilitation: a feasibility study.
Clément Lhoste, Max Quast, Andrea Ronco and 6 others
PMID 42163338WHAT IT FOUND
Patients with upper-limb weakness could set up a wearable ear stimulation device themselves, therapists found it easy to use, and it automatically stimulated during movements more often than manual triggering.
Motor changes were modest and not proof of efficacy.
Key findings
01Patients could set up the device themselves in about 31 seconds on average, therapists assisted only two with severe bilateral impairment, and no serious adverse events were reported, with three transient headaches noted.
02The automated system stimulated during movement with similar accuracy to therapist triggering, but it stimulated a larger proportion of movements (50.4% versus 23.4%).
03After four weeks, ARAT scores improved by 3.3 points and BBT scores by 3.3 blocks on average, and stroke FMA-UE improved by 5.0 points, but these were secondary, uncontrolled changes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Nine patients completed the study, so the findings are preliminary and cannot establish effectiveness. There was no sham or control group, so improvement in motor scores cannot be separated from usual therapy, spontaneous recovery, or other factors. The motor score changes were secondary outcomes, and the stroke FMA-UE mean change did not reach the reported minimal clinically important difference. One participant completed only 12 of 20 sessions, and some analyses excluded sessions or participants because of early discharge, missing labels, communication errors, or incomplete questionnaires. Two very impaired participants received zero scores for ARAT and BBT, which affects interpretation of the average changes. The device was tested only in a clinic with trained therapists, not in home settings.
The easy way to misread this
Do not conclude that the ear stimulation device improves upper-limb recovery. The motor score changes were secondary, uncontrolled, and the stroke arm motor score change did not reach the reported minimal clinically important difference.
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