Dependability of Electrode to Modiolus Distance in Patients Specific Electrode Selection: A Cadaveric Model Study.

Autor: Sharma V; Department of Otorhinolaryngology, All India Institute of Medical Sciences, Jodhpur, India., Das K N; Department of Otorhinolaryngology, All India Institute of Medical Sciences, Jodhpur, India., Jangra A; Department of Otorhinolaryngology, All India Institute of Medical Sciences, Jodhpur, India., Tiwari S; Department of Diagnostic and Interventional, Radiology, All India Institute of Medical Sciences, Jodhpur, India., Khera P; Department of Diagnostic and Interventional, Radiology, All India Institute of Medical Sciences, Jodhpur, India., Soni K; Department of Otorhinolaryngology, All India Institute of Medical Sciences, Jodhpur, India., Dixit SG; Department of Anatomy, All India Institute of Medical Sciences, Jodhpur, India., Nayyar AK; Department of Anatomy, All India Institute of Medical Sciences, Jodhpur, India., Goyal A; Department of Otorhinolaryngology, All India Institute of Medical Sciences, Jodhpur, India.
Jazyk: angličtina
Zdroj: The Laryngoscope [Laryngoscope] 2024 Nov; Vol. 134 (11), pp. 4736-4744. Date of Electronic Publication: 2024 Jun 11.
DOI: 10.1002/lary.31565
Abstrakt: Objective: This study aims to discern the disparities in the electrode-to-modiolus distance (EMD) between cochleostomy and round window approaches when performed sequentially in the same temporal bone. Additionally, the study seeks to identify the cochlear metrics that contribute to these differences.
Methodology: A cross-sectional study was conducted, involving the sequential insertion of a 12-electrode array through both round window and cochleostomy approaches in cadaveric temporal bones. Postimplantation high-resolution CT scans were employed to calculate various parameters.
Results: A total of 12 temporal bones were included in the imaging analysis, revealing a mean cochlear duct length of 32.892 mm. The EMD demonstrated a gradual increase from electrode 1 (C1) in the apex (1.9 ± 0.07 mm; n = 24) to electrode 12 (C12) in the basal turn (4.6 ± 0.24 mm; n = 12; p < 0.01). Significantly higher EMD values were observed in the cochleostomy group. Correlation analysis indicated a strong positive correlation between EMD and cochlear perimeter (CP) (r s  = 0.64; n = 12; p = 0.03) and a strong negative correlation with the depth of insertion (DOI) in both the middle and basal turns (r s  = - 0.78; n = 20; p < 0.01). Additionally, EMD showed a strong negative correlation with the DOI-CP ratio (r s  = -0.81; n = 12; p < 0.01).
Conclusion: The cochleostomy group exhibited a significantly higher EMD compared with the round window group. The strong negative correlation between EMD and DOI-CP ratio suggests that in larger cochleae with shallower insertions, EMD is greater than in smaller cochleae with deeper insertions.
Level of Evidence: NA Laryngoscope, 134:4736-4744, 2024.
(© 2024 The Author(s). The Laryngoscope published by Wiley Periodicals LLC on behalf of The American Laryngological, Rhinological and Otological Society, Inc.)
Databáze: MEDLINE
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