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Quantifying Residual Hearing Loss from Electrode Insertion Trauma in Cochlear Implant Surgery: A Prospective
Nidhin Das K1, Vidhu Sharma1, Siddharth Manoj1
1Department of Otorhinolaryngology, All India Institute of Medical Sciences, Jodhpur, India.
The Journal of International Advanced Otology
|September 23, 2025
Summary
Cochlear implantation preserves hearing in deaf children, with round-window insertion showing better results. Deeper electrode placement negatively impacts hearing preservation and speech outcomes.
Area of Science:
- Otolaryngology
- Neuroscience
- Speech-Language Pathology
Background:
- Electrode insertion trauma-induced hearing loss (EITHL) is a concern in pediatric cochlear implantation.
- Quantifying EITHL, its risk factors, and speech impact is crucial for prelingually deafened children.
Purpose of the Study:
- To quantify EITHL in prelingually deafened children undergoing cochlear implantation.
- To identify risk factors for EITHL and assess its impact on speech outcomes.
Main Methods:
- Prospective observational study of 40 children (aged 1-5 years) with severe-to-profound sensorineural hearing loss.
- Cochlear implantation using cochleostomy (CS) or round-window (RW) techniques.
- Auditory steady-state response (ASSR) for hearing preservation; word recognition scores (WRS) for speech outcomes.
Main Results:
- All participants achieved Grade 1 hearing preservation (>75%).
- RW technique showed better hearing preservation than CS, though not statistically significant.
- Deeper electrode insertion correlated with poorer hearing preservation (r=-0.45, P=.03).
- Word recognition scores improved over time, especially in bilateral implant recipients.
Conclusions:
- Both CS and RW cochlear implantation preserve residual hearing in prelingually deafened children.
- RW insertion offers superior hearing preservation.
- Optimizing electrode insertion depth is key for maximizing hearing preservation and speech outcomes.
