Cochlear Implant Outcomes: A Comparison between Irradiated and Non-irradiated Ears

Area of Science:

• Otolaryngology
• Oncology
• Audiology

Background:

• Radiotherapy for head and neck cancers can cause sensorineural hearing loss.
• Damage to cochlear and auditory pathways is a potential side effect.
• Auditory nerve function is crucial for cochlear implant success.

Purpose of the Study:

• To evaluate hearing outcomes after cochlear implantation in irradiated ears.
• To compare outcomes in patients with and without prior radiotherapy.
• To assess the efficacy of cochlear implants in a challenging patient population.

Main Methods:

• Retrospective study of cochlear implant recipients with prior radiotherapy (n=8) and a control group (n=8).
• Analysis of case records, speech discrimination scores (SDS), and Abbreviated Profile of Hearing Aid Benefit (APHAB) questionnaire.
• Non-inferiority (NI) testing to compare outcomes between groups.

Main Results:

• Irradiated group showed significant improvements in global APHAB scores (28.9%) and SDS (66.9%).
• Key APHAB categories (ease of communication, background noise) were not inferior to the control group.
• Reverberation and aversiveness categories did not meet non-inferiority criteria.

Conclusions:

• Cochlear implantation yields marked hearing improvements in post-irradiated patients.
• Hearing outcomes are comparable to non-irradiated patients, demonstrating efficacy.
• The study supports cochlear implantation as a viable option for hearing restoration in this cohort.