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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
Published on: August 4, 2023
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Systematic Review of Intracochlear Measurements and Effect on Postoperative Auditory Outcomes after Cochlear Implant
Zubair Hasan, Seraphina Key1, Michael Lee2
1Faculty of Medicine and Health, University of Sydney, Australia.
Summary
Cochlear implant electrode position impacts hearing outcomes. Scalar translocation and larger electrode-modiolar distance are linked to poorer results, while insertion angle shows variable effects and wrapping factor has no correlation.
Area of Science:
- Otolaryngology
- Neurosurgery
- Medical Imaging
Background:
- The electrode-neuron interface (ENI) quality is crucial for cochlear implant (CI) auditory success.
- Radiological parameters of ENI, including insertion angle, wrapping factor, scalar translocation, and electrode-modiolar distance, are key factors.
Approach:
- Systematic review of 31 studies (2,887 patients) analyzing postoperative imaging and auditory outcomes.
- Inclusion criteria focused on human CI recipients with positional data (AngI, WF, ScaT, EMD) and auditory results.
- Risk of bias assessed using ROBINS-I; statistical analysis was not performed due to data heterogeneity.
Key Points:
- Variable relationships exist between insertion angle (AngI) and auditory outcomes.
- Scalar translocation (ScaT) and larger electrode-modiolar distance (EMD) correlate with poorer CI outcomes.
- Wrapping factor (WF) did not demonstrate a correlation with auditory outcomes.
Conclusions:
- Electrode position significantly influences cochlear implant performance.
- ScaT and increased EMD are associated with diminished auditory function.
- Further research may clarify the role of AngI in optimizing auditory results.
