Initial Operative Experience and Short-term Hearing Preservation Results With a Mid-scala Cochlear Implant Electrode...

Area of Science:

• Otolaryngology
• Biomedical Engineering
• Neuroscience

Background:

• Cochlear implantation is a critical treatment for severe to profound hearing loss.
• Electrode design significantly impacts surgical outcomes and hearing preservation.
• The Advanced Bionics (AB) Mid Scala Electrode (MSE) was developed to potentially improve cochlear implant performance.

Purpose of the Study:

• To evaluate the initial surgical experience with the AB MSE.
• To compare hearing preservation outcomes between the AB MSE and the AB 1j electrode.
• To assess secondary surgical outcomes associated with MSE implantation.

Main Methods:

• Retrospective review of 63 MSE implants versus age- and sex-matched 1j electrode implants.
• Comparison of electrode insertion depth and pre- to postoperative hearing threshold changes.
• Analysis of hearing preservation as a function of insertion depth and secondary surgical outcomes.

Main Results:

• Electrode insertion depth was more consistent with the MSE array than the 1j array.
• Patients receiving MSE electrodes demonstrated significantly better hearing preservation, with smaller threshold shifts across multiple frequencies (p < 0.05).
• Deeper insertion correlated with worse low-frequency hearing preservation, irrespective of electrode type.

Conclusions:

• The AB MSE provides more consistent insertion depth and enhanced hearing preservation compared to the 1j electrode.
• Surgical outcomes are comparable between the two electrode types, with minor differences in secondary measures.
• The MSE electrode represents a promising advancement for cochlear implantation, particularly for hearing preservation.