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Updated: Aug 31, 2025
Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
Published on: August 4, 2023
Comprehensive Etiologic Analyses in Pediatric Cochlear Implantees and the Clinical Implications
Chee-Yee Lee1,2, Pei-Hsuan Lin3, Cheng-Yu Tsai4
1Department of Otolaryngology-Head and Neck Surgery, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung 42743, Taiwan.
Insights
Determining the cause of profound sensorineural hearing impairment (SNHI) in children is crucial for predicting cochlear implant (CI) success. Genetic factors and cochlear nerve deficiency significantly impact CI outcomes.
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.
Abstract:
Cochlear implantation is the treatment of choice for children with profound sensorineural hearing impairment (SNHI), yet the outcomes of cochlear implants (CI) vary significantly across individuals. To investigate the CI outcomes in pediatric patients with SNHI due to various etiologies, we prospectively recruited children who underwent CI surgery at two tertiary referral CI centers from 2010 to 2021. All patients underwent comprehensive history taking, next generation sequencing (NGS)-based genetic examinations, and imaging studies. The CI outcomes were evaluated using Categories of Auditory Performance (CAP) and Speech Intelligibility Rating (SIR) scores. Of the 160 pediatric cochlear implantees (76 females and 84 males) included in this study, comprehensive etiological work-up helped achieve clinical diagnoses in 83.1% (133/160) of the patients, with genetic factors being the leading cause (61.3%). Imaging studies identified certain findings in 31 additional patients (19.3%). Four patients (2.5%) were identified with congenital cytomegalovirus infection (cCMV), and 27 patients (16.9%) remained with unknown etiologies. Pathogenic variants in the four predominant non-syndromic SNHI genes (i.e., SLC26A4, GJB2, MYO15A, and OTOF) were associated with favorable CI outcomes (Chi-square test, p = 0.023), whereas cochlear nerve deficiency (CND) on imaging studies was associated with unfavorable CI outcomes (Chi-square test, p < 0.001). Our results demonstrated a clear correlation between the etiologies and CI outcomes, underscoring the importance of thorough etiological work-up preoperatively in pediatric CI candidates.
