Direct Acoustic Cochlear Implants Lead to an Improved Speech Perception Gap Compared to Conventional Hearing Aid

Area of Science:

• Audiology
• Otorhinolaryngology
• Biomedical Engineering

Background:

• Moderate-to-severe mixed hearing loss presents challenges for conventional hearing aid users.
• Direct Acoustic Cochlear Implants (DACI) offer a novel approach to hearing restoration.
• Understanding the speech perception outcomes of DACI is crucial for patient selection and device efficacy.

Purpose of the Study:

• To evaluate the aided speech perception in quiet for patients using Direct Acoustic Cochlear Implants (DACI).
• To compare the speech perception gap between DACI users and conventional hearing aid (HA) users.
• To assess the performance of DACI in relation to maximum speech recognition potential (PBmax).

Main Methods:

• Retrospective comparative study involving 59 DACI-implanted ears.
• Comparison with published data of 208 conventional hearing aid users across different hearing loss ranges (35-75 dB HL).
• Evaluation of aided monosyllabic word scores, predicted PBmax, and speech perception gap.

Main Results:

• DACI patients with cochlear reserves of 45-65 dB HL showed significantly better aided speech perception than conventional HA users.
• The speech perception gap was 11% for DACI versus 21% for conventional HAs.
• 52% of DACI patients approximated PBmax, compared to only 36% of HA users.

Conclusions:

• DACI systems provide superior speech perception in quiet for individuals with moderate-to-severe inner ear hearing loss (45-65 dB HL).
• Speech performance with DACI more closely approaches the maximum possible score (PBmax) compared to conventional hearing aids.
• DACI represents an effective alternative for improving speech understanding in specific patient populations.