Anatomy-based fitting improves speech perception in noise for cochlear implant recipients with single-sided deafness

Area of Science:

• Audiology and Hearing Science
• Biomedical Engineering
• Neurosurgery

Background:

• Single-sided deafness (SSD) presents unique challenges for cochlear implant (CI) users.
• Optimizing CI fitting maps is crucial for maximizing auditory rehabilitation outcomes.
• Anatomy-based fitting (ABF) offers a personalized approach to CI programming.

Purpose of the Study:

• To compare objective and subjective hearing outcomes between ABF and clinically-based fitting (CBF) maps in experienced SSD CI users.
• To evaluate the impact of ABF on speech perception in noise and binaural hearing.
• To assess user preference for ABF versus CBF maps.

Main Methods:

• Twelve postlingual SSD CI users participated in the study.
• OTOPLAN software utilized post-operative CT scans to determine electrode positions for ABF map creation.
• Objective speech perception (quiet and noise), binaural effects, and subjective sound quality were assessed for both ABF and CBF maps.

Main Results:

• ABF maps yielded significantly better speech perception in noise compared to CBF maps.
• Significant improvements in summation and squelch effects were observed with ABF maps, indicating enhanced binaural hearing.
• All participants preferred the ABF map post-study, irrespective of electrode insertion depth.

Conclusions:

• Anatomy-based fitting (ABF) maps provide significant benefits for experienced single-sided deafness cochlear implant users.
• ABF enhances speech perception in noise and binaural hearing capabilities.
• The ABF map is preferred by users, suggesting its clinical utility in SSD CI rehabilitation.