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Vagus nerve stimulation results

tenseargear

Updated: Oct 19, 2024

The University of Melbourne, Parkville, VIC, Australia.

Critical Review of Transcutaneous Vagus Nerve Stimulation.



Transcutaneous VNS is a non-invasive technique employing surface electrodes to deliver electrical currents, typically targeting the auricular and cervical branches of the vagus nerve.


The accessibility and relative safety of tVNS devices have spurred a "do-it-yourself" trend, with individuals using these therapies at home for self-improvement purposes.


Stimulation frequency, the commonly used range is 20–30 Hz. However, lower frequencies have also been explored. For instance, studies have shown that 10 Hz tVNS administered three times daily for 20-minute sessions over 6 months reduced seizure occurrences, while 8 Hz stimulation activated specific brain areas according to fMRI measurements. Additionally, research indicates that migraine episodes were more effectively reduced with 1 Hz stimulation compared to 25 Hz.


 Stimulation intensity is typically adjusted based on individual sensitivity or just below the pain threshold, resulting in a wide range of amplitudes across studies. Moreover, differences in stimulation tolerance among participants are influenced by electrode electrochemistry.


Stimulation site selection often hinges on electrode geometry, with clip electrodes typically attached to the tragus, concha or cymba concha.


Ultimately, the development of user-friendly tVNS devices holds promise for enhancing therapy accessibility and compliance. Continued research and technological advancements will be pivotal in realising the full therapeutic potential of tVNS.

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