Transcutaneous auricular vagus nerve stimulation enhances structural and functional remodeling in sensorimotor networks following intracerebral hemorrhage in rats.
Jun Zhang, Zengyu Zhang, Lichao Wei and 12 others
PMID 40691625WHAT IT FOUND
In rats with basal ganglia hemorrhage, vagus nerve stimulation through the ear plus passive treadmill training improved neurological scores and brain remodeling markers.
It is animal evidence, not proof it works in patients.
Key findings
01In rats, vagus nerve stimulation through the ear plus passive treadmill training reduced neurological deficit scores at weeks 2 and 4 compared with passive treadmill training alone.
02In rats receiving passive treadmill training, adding vagus nerve stimulation through the ear increased myelin density by week 2 and improved corticospinal tract reconstruction and fractional anisotropy by week 4.
03In the studied rats, higher sensorimotor activity and connectivity values were negatively correlated with neurological deficit scores.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was in rats with induced basal ganglia hemorrhage, so it does not show what would happen in human patients. The authors state the rat model may not fully capture the complexity and variability of human ICH. The authors state the study focused on short- to mid-term effects, so long-term sustainability is unclear. The authors state mNSS provided a limited assessment of fine motor and cognitive recovery, and comprehensive behavioral evaluations were not included. The authors state the underlying molecular mechanisms were not extensively explored. The authors state the taVNS parameters may not be universally optimal. The intervention was taVNS combined with passive treadmill training, so the contribution of taVNS alone cannot be separated from treadmill training. The supplied text does not report the total number of rats analysed, random allocation method, or blinding method.
Declared interests
Funded by Academician Innovation Platform Fund of Hainan Province, Shanghai Shenkang Hospital Development Center-Municipal Hospital Diagnosis and Treatment Technology Promotion and Optimization Management Project, and National Natural Science Foundation of China. No author conflict-of-interest declaration is given in the supplied text.
The easy way to misread this
Do not treat this as evidence that vagus nerve stimulation through the ear improves recovery in human stroke patients. The study was done in rats, and the stimulation was given together with passive treadmill training, so it does not show the effect of stimulation alone or its effect in people.