Comprehensive Etiologic Analyses in Pediatric Cochlear Implantees and the Clinical Implications

Area of Science:

• Pediatric Otolaryngology
• Genetics of Hearing Loss
• Auditory Implants

Background:

• Cochlear implantation (CI) is a primary treatment for pediatric profound sensorineural hearing impairment (SNHI).
• Individual CI outcomes vary widely, necessitating investigation into influencing factors.
• Understanding the etiology of SNHI is key to optimizing CI results.

Purpose of the Study:

• To investigate the relationship between the etiology of SNHI and cochlear implant outcomes in pediatric patients.
• To identify specific etiological factors associated with favorable or unfavorable CI results.
• To emphasize the importance of preoperative etiological assessment in pediatric CI candidates.

Main Methods:

• Prospective cohort study of 160 pediatric patients undergoing CI surgery between 2010 and 2021.
• Comprehensive etiological work-up including history, next-generation sequencing (NGS), and imaging studies.
• CI outcomes assessed using Categories of Auditory Performance (CAP) and Speech Intelligibility Rating (SIR) scores.

Main Results:

• Clinical diagnoses were established in 83.1% of patients, with genetic factors as the leading cause (61.3%).
• Pathogenic variants in key SNHI genes (SLC26A4, GJB2, MYO15A, OTOF) correlated with favorable CI outcomes (p=0.023).
• Cochlear nerve deficiency (CND) identified via imaging was strongly associated with unfavorable CI outcomes (p<0.001).

Conclusions:

• A significant correlation exists between the etiology of SNHI and CI outcomes in pediatric patients.
• Thorough preoperative etiological evaluation, including genetic testing and imaging, is essential for predicting CI success.
• Identifying specific genetic variants or imaging findings can guide prognostication and management for pediatric CI recipients.