Randomized Controlled Trial Comparing Outcomes for Adult Cochlear Implant Recipients Using a Lateral Wall or...

Area of Science:

• Otolaryngology
• Neurosurgery
• Biomedical Engineering

Background:

• Cochlear implantation is a key treatment for severe to profound sensorineural hearing loss.
• The choice between perimodiolar and lateral wall electrode arrays is a critical surgical decision.
• Understanding the impact of array type and position on hearing outcomes is essential.

Purpose of the Study:

• To compare speech perception and vestibular outcomes in adult cochlear implant recipients based on electrode array type (perimodiolar vs. lateral wall).
• To investigate the relationship between final electrode array position and auditory performance.

Main Methods:

• A prospective randomized controlled study involving 144 adult participants with severe to profound hearing loss.
• Randomization to receive either perimodiolar or lateral wall electrode arrays.
• Assessment of electrode array position via cone-beam computed tomography, speech perception pre- and post-operatively, and vestibular symptoms.

Main Results:

• Significant speech perception improvement was observed 3 and 12 months post-implantation for both array types.
• No significant difference in speech perception scores was found between perimodiolar and lateral wall electrode arrays at 3 or 12 months.
• Electrode array position within the scala tympani did not correlate with speech perception outcomes, and no significant difference in vestibular symptoms was noted between groups.

Conclusions:

• Both perimodiolar and lateral wall electrode arrays, when correctly placed in the scala tympani, result in excellent speech perception outcomes.
• The choice of electrode array type does not appear to significantly influence speech perception or vestibular function in adult cochlear implant users.