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Published on: August 23, 2022
Repetitive transcranial magnetic stimulation: hearing safety considerations
Stéphane Tringali1, Xavier Perrot2, Lionel Collet2
1Université de Lyon, Lyon, France; INSERM U1028, CNRS UMR5292, Lyon Neuroscience Research Center, Brain Dynamics and Cognition Team, Lyon, France; University Lyon 1, Lyon, France; Department of ENT, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre-Bénite, France.
Repetitive transcranial magnetic stimulation (rTMS) noise can temporarily affect hearing mechanisms, even with hearing protection. This transient hearing disturbance from rTMS noise is noticeable in individuals with less earplug protection.
Area of Science:
- Neuroscience
- Audiology
- Biomedical Engineering
Background:
- Repetitive transcranial magnetic stimulation (rTMS) guidelines require frequent safety updates.
- rTMS noise exceeds 120 dB C, posing a risk for hearing loss.
- The impact of rTMS noise on hearing for patients and practitioners is understudied.
Purpose of the Study:
- To investigate the effects of rTMS noise on hearing.
- Utilize transiently evoked otoacoustic emissions (TEOAEs) as an objective measure of cochlear function.
Main Methods:
- Recorded hearing thresholds and TEOAEs in 24 healthy subjects.
- Subjects underwent a single 20-minute real or sham rTMS session targeting the superior temporal gyrus.
- Stimulation parameters: 1200 pulses at 100% motor threshold.
Main Results:
- No significant difference in hearing thresholds between real and sham rTMS groups.
- A significant increase in TEOAE amplitude difference post-rTMS was observed in subjects with minimal earplug protection.
- A slight decrease in TEOAE amplitude and minor hearing alteration occurred at high rTMS intensities, which resolved within 1 hour.
Conclusions:
- rTMS noise can transiently disturb hearing mechanisms, even with safety measures and hearing protection.
- This transient hearing effect warrants consideration by Institutional Review Boards for high-intensity rTMS applications.
