[Computed tomography in the evaluation of cochlear structural features in cochlear implantation]

Area of Science:

• Otolaryngology
• Neurosurgery
• Radiology

Background:

• Cochlear implantation (CI) is a key treatment for profound hearing loss.
• Understanding cochlear anatomy is crucial for successful CI outcomes.
• Previous studies have explored cochlear dimensions, but direct correlation with electrode insertion depth requires further investigation.

Purpose of the Study:

• To analyze temporal bone CT scans in deaf patients.
• To compare cochlear parameters across different age groups.
• To determine the correlation between cochlear dimensions and the depth of intracochlear electrode insertion in cochlear implant recipients.

Main Methods:

• Retrospective analysis of temporal bone CT scans from 136 deaf patients.
• Inclusion of 56 patients who underwent cochlear implantation (CI).
• Calculation and comparison of cochlear parameters: diameter of cochlear base (DCB), basal helix diameter, cochlear height, and cochlear base-promontorial wall angle.

Main Results:

• Significant correlation found between the diameter of the cochlear base (DCB) and the depth of electrode insertion for CI22M and CI24M implants.
• Estimated optimal DCB values for more frequent placement of the active electrode part in the tympanic scala.
• Variations in cochlear parameters were observed across different age groups.

Conclusions:

• The diameter of the cochlear base (DCB) is a predictive anatomical marker for cochlear implant electrode insertion depth.
• This correlation can guide surgical planning to optimize electrode positioning within the tympanic scala.
• Further research may refine DCB thresholds for improved CI surgical outcomes.