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Risks of Intracochlear Pressures From Laser Stapedotomy
Emily S Misch1, Renee M Banakis Hartl, Samuel P Gubbels
1Department of Otolaryngology, University of Colorado School of Medicine, Aurora, Colorado.
Summary
Laser stapedotomy surgery can generate high intracochlear pressures, potentially causing hearing loss. Minimizing laser use and exploring alternative techniques are recommended to protect cochlear structures.
Area of Science:
- Otolaryngology
- Neurosurgery
- Biomedical Engineering
Background:
- Sensorineural hearing loss is a known risk of stapes surgery.
- Pressure changes from laser use or surgical manipulations may cause hearing loss.
Purpose of the Study:
- To test the hypothesis that high sound pressure levels are generated in the cochlea during laser stapedotomy.
- To quantify intracochlear pressure changes during laser stapedotomy.
Main Methods:
- Human cadaveric heads underwent mastoidectomy.
- Fiber-optic sensors were placed in scala tympani and vestibuli.
- Intracochlear pressures were measured during key laser stapedotomy steps.
Main Results:
- Key steps in laser stapedotomy produced high-intensity pressures in the cochlea.
- Pressure transients were comparable to those from high-intensity acoustic stimuli.
Conclusions:
- Surgical manipulations during laser stapedotomy create significant intracochlear pressure changes.
- Laser application should be minimized, and alternatives to mechanical downfracture investigated.
- Intracochlear pressure transients may damage cochlear sensory epithelium, highlighting the need to limit surgical trauma.
