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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
Published on: August 4, 2023
Post-surgical changes in wideband absorbance in paediatric cochlear implant users after mastoidectomy and posterior
Maraiah Mamatha Nerale1, Bansode Rohit Raghunath2, Arunraj Karuppannan3
1Department of Audiology, All India Institute of Speech and Hearing, Mysuru, Karnataka, India.
Background:
Although Cochlear implantation (CI) is effective in restoring hearing for children with severe-to-profound sensorineural hearing loss, it may influence the middle ear mechanics, potentially causing an air-bone gap and altering middle ear stiffness, which is not detected by traditional 226 Hz tympanometry.
Aims/Objectives:
To investigate the effect of mastoidectomy posterior tympanotomy (MPTA) on wideband absorbance (WBA) in children with CI.
Materials And Methods:
The study included 20 normal-hearing children (normal group) and 10 children with CIs who underwent MPTA (CI-MPTA group), aged 3-10 years. WBA at peak and ambient pressure, resonance frequency, and 226 Hz tympanometry were measured.
Results:
The normal group showed maximum absorbance at 1250 and 3000 Hz, whereas the CI-MPTA group had a single peak at 3000 Hz. The CI-MPTA group exhibited reduced absorbance at low and mid-frequencies (250-1500 Hz), with significant differences (p < 0.05) observed at 800-1250 Hz for peak pressure and 1000-1250 Hz for ambient pressure. No significant differences were found in resonance frequency or 226 Hz tympanometry.
Conclusions And Significance:
CI with MPTA changes middle ear absorbance patterns, affecting the low- and mid-frequency regions. These findings indicate the importance of using WBA tympanometry to monitor middle and inner ear mechanics post-CI.
