Association of Total Cochlear Volume and Initial Hearing Preservation With a Straight Electrode Array.

Area of Science:

• Otolaryngology
• Neurosurgery
• Biomedical Engineering

Background:

• Cochlear implantation (CI) aims to restore hearing in individuals with severe to profound hearing loss.
• Preservation of residual low-frequency hearing is crucial for optimizing CI outcomes.
• Cochlear anatomy, specifically total cochlear volume, may influence hearing preservation after CI surgery.

Purpose of the Study:

• To investigate the association between total cochlear volume and low-frequency hearing preservation in CI recipients.
• To evaluate the impact of cochlear volume on hearing outcomes with a straight electrode array.

Main Methods:

• Retrospective analysis of adult CI recipients implanted with a 23 mm straight array.
• Preoperative CT imaging was used to estimate total cochlear volume.
• Low-frequency hearing preservation was assessed by measuring the shift in the low-frequency pure tone average (LFPTA) at activation and 6 months postactivation.

Main Results:

• Fourteen patients were included in the study.
• Significant correlations were found between total cochlear volume and LFPTA shifts at activation (r=0.28, P=0.05) and 6 months postactivation (r=0.29, P=0.048).
• Mean LFPTA shifts were 21 dB HL at activation and 22 dB HL at 6 months postactivation.

Conclusions:

• A larger total cochlear volume is associated with better low-frequency hearing preservation in CI recipients using a straight array.
• Cochlear anatomy assessment can help stratify individual patient risk for hearing loss.
• Understanding cochlear volume may aid in device selection for CI patients.