Related Experiment Video
Updated: Apr 27, 2026
06:54
Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
Published on: August 4, 2023
2.1K
Pattern of hearing loss following cochlear implantation
Eyal Raveh1, Joseph Attias, Benny Nageris
1Department of Otorhinolaryngology, Schneider Children's Medical Center of Israel and Rabin Medical Center, 49202, Petach Tikva, Israel, reyal@clalit.org.il.
Summary
Cochlear implantation can worsen hearing, potentially causing mixed hearing loss. Post-surgery air-conduction thresholds significantly decline, increasing the air-bone gap, suggesting inner ear mechanical changes.
Area of Science:
- Audiology
- Otolaryngology
- Neurosurgery
Background:
- Cochlear implantation often leads to hearing deterioration.
- Residual hearing is typically assessed using only air-conduction thresholds.
- The origin of hearing damage post-implantation is presumed sensory.
Purpose of the Study:
- To investigate if cochlear implant surgery alters air- and bone-conduction thresholds.
- To determine if these alterations result in a mixed-type hearing loss.
- To analyze changes in the air-bone gap following cochlear implantation.
Main Methods:
- Study included 18 patients undergoing cochlear implant surgery.
- Audiologic, otologic, and imaging assessments were performed pre- and post-surgery.
- Air- and bone-conduction thresholds were measured in operated and non-operated ears.
Main Results:
- Air-conduction thresholds in treated ears significantly deteriorated by 10-21 dB post-surgery.
- Bone-conduction levels showed nonsignificant deterioration (0.8-7.5 dB).
- The air-bone gap increased postoperatively, primarily due to air-conduction threshold changes.
Conclusions:
- Cochlear implantation can induce mixed-type hearing loss.
- Increased air-conduction thresholds significantly contribute to the postoperative air-bone gap.
- Inner ear mechanics may be a key factor in the observed air-bone gap changes.
