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

摘要

PurposeDetermine the effect of cochleostomy and facial recess packing on cochlear implant electrode distance from the modiolus. Materials and methodsTwo 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. ResultsPacking 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?