Multi-Frequency Electrocochleography Results in Fewer Drop Alarms During Cochlear Implant Insertion

Area of Science:

• Otoacoustic Emissions and Electrophysiology
• Neurosurgery and Biomedical Engineering

Background:

• Cochlear implantation (CI) is a crucial treatment for severe to profound sensorineural hearing loss.
• Intracochlear electrocochleography (ECochG) monitors the cochlear microenvironment during CI surgery.
• Traditional single-frequency ECochG may have limitations in accurately assessing intraoperative changes.

Purpose of the Study:

• To evaluate intracochlear electrocochleography (ECochG) amplitude parameters during cochlear implantation (CI).
• To assess the efficacy of a novel multi-frequency ECochG algorithm compared to single-frequency methods.
• To determine if the multi-frequency algorithm impacts intraoperative insertion track patterns.

Main Methods:

• A prospective cohort study involving 195 ears across 18 high-volume CI centers.
• Adults with sensorineural hearing loss undergoing CI with Advanced Bionics Ultra 3D devices were included.
• Simultaneous multi-frequency ECochG stimulation (125-4000 Hz) and recording were performed during device insertion.

Main Results:

• The multi-frequency ECochG algorithm resulted in significantly fewer drop alarms (0.42) compared to single-frequency ECochG (1.72; p < 0.001).
• A decrease in Type C (amplitude rise then drop) and Type D (no response) insertion track patterns was observed with the multi-frequency approach.
• Multi-frequency ECochG demonstrated improved cochlear response detection compared to single-frequency methods.

Conclusions:

• A novel multi-frequency ECochG algorithm during CI is associated with fewer drop alarms.
• This method alters insertion track patterns, suggesting a more accurate assessment of the cochlear microenvironment.
• The findings support the use of multi-frequency ECochG for enhanced intraoperative monitoring during cochlear implantation.