Pediatric cochlear implant fitting parameters in inner ear malformation: Is it same with normal cochlea?

Area of Science:

• Otolaryngology
• Biomedical Engineering
• Audiology

Background:

• Inner ear malformations (IEM) present unique challenges for cochlear implant (CI) recipients.
• Understanding CI mapping parameter adjustments in pediatric IEM is crucial for optimizing auditory outcomes.

Purpose of the Study:

• To evaluate and compare CI mapping parameters in pediatric users with IEM versus those with normal cochlear anatomy.
• To track long-term changes in these parameters over 24 months post-implantation.

Main Methods:

• Retrospective analysis of 118 pediatric CI users (68 IEM, 59 controls).
• Analysis of impedance, threshold levels (THR), most comfortable levels (MCL), pulse width (PW), and rate at initial activation and at 6, 12, and 24 months post-op.
• Comparison of parameters between IEM and control groups and over time.

Main Results:

• Significant differences in impedance, THR, MCL, and PW between IEM and control groups across all time points.
• Progressive increases in THR, MCL, and PW observed in both groups over 24 months, with higher values in the IEM group.
• Statistically significant differences in pulse rate noted at initial activation within and between groups.

Conclusions:

• Pediatric CI users with IEM necessitate individualized fitting parameters and more frequent mapping sessions.
• Increased PW, THR, and MCL are required over time for IEM patients, with adjustment rates varying by IEM subgroup.
• This study provides novel insights into the long-term mapping characteristics of pediatric CI users with diverse IEMs.