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Cochleostomy and facial recess packing alter cochlear implant electrode location in a human cochlea model. | LitMetric

AI Article Synopsis

  • The study investigates how cochleostomy and facial recess packing affect the distance of cochlear implant electrodes from the modiolus in a human cochlea model.
  • Two types of electrodes (perimodiolar and lateral wall) were tested with various packing conditions (superior, inferior, both, or none).
  • Results show that packing superior to the electrode significantly reduces distance from the modiolus, especially with the perimodiolar electrode at the middle basal turn, indicating the importance of packing technique in cochlear implant procedures.

Article Abstract

Purpose: Determine the effect of cochleostomy and facial recess packing on cochlear implant electrode distance from the modiolus.

Materials And Methods: Two otolaryngology residents (PGY5 and PGY6) and one attending ear surgeon performed electrode insertions on a human cochlea model using perimodiolar (Cochlear® Slim Modiolar 532™, CI532) and lateral wall electrodes (Cochlear® Slim Straight 522™, CI522) via a cochleostomy. Packing material was simulated using cotton and placed in the cochleostomy and facial recess under the following conditions: 1) inferior to the electrode, 2) superior, 3) both inferior and superior, and 4) no packing. Distance of the electrode from the modiolus at the proximal, middle, and distal basal turn of the cochlea were measured by photomicrograph analysis.

Results: Packing superior to the CI532 resulted in a significant decrease in distance from the modiolus at the middle and distal basal turn compared to the inferior condition, with the largest effect in the middle basal turn (0.25 mm vs. 1.92 mm, respectively, p < 0.001). For the CI522, packing superior similarly resulted in decreased distance to the modiolus when compared to the inferior packing condition at the middle and distal basal turn regions, with the largest effect in the middle basal turn (1.25 mm vs. 1.75 mm, respectively, p = 0.002).

Conclusions: Packing of the cochleostomy site and facial recess has a significant effect on electrode distance from the modiolus in the middle and distal basal turn using a model of a human cochlea. Effects were more pronounced when using the perimodiolar (CI532) electrode.

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Source
http://dx.doi.org/10.1016/j.amjoto.2018.05.008DOI Listing

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