title: Is electrode-modiolus distance a prognostic factor for hearing performances after cochlear implant surgery?
abstract: The aim of this study was to evaluate electrode array position in relation to cochlear anatomy and its influence on hearing performance in cochlear implantees. Twenty-two patients (25 ears) with Med-El cochlear implants were included in this retrospective study. A negative correlation was observed between electrode-modiolus distance (EMD) at the cochlear base and monosyllabic word discrimination 6 months after implantation. We found no correlation between EMD and hearing outcome at 12 months. The insertion depth/cochlear perimeter ratio appeared to negatively influence the EMD at the base. Indeed, deep insertions in small cochleae appeared to yield smaller EMD and better hearing performance. This observation supports the idea of preplanning the surgery by adapting the electrode array to the length of the available scala tympani.
authors.affiliation: Otolaryngology Department, Beaujon Hospital, APHP, Clichy, France.
authors.forename: Gonzalo N
authors.initials: GN
authors.lastname: Esquia Medina
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Borel
authors.forename: Yann
authors.initials: Y
authors.lastname: Nguyen
authors.forename: Emmanuèle
authors.initials: E
authors.lastname: Ambert-Dahan
authors.forename: Evelyne
authors.initials: E
authors.lastname: Ferrary
authors.forename: Olivier
authors.initials: O
authors.lastname: Sterkers
authors.forename: Alexis Bozorg
authors.initials: AB
authors.lastname: Grayeli
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003051:Cochlea / Q000033:anatomy & histology / Q000601:surgery; D019929:Cochlear Implantation / Q000295:instrumentation / Q000379:methods*; D003054:Cochlear Implants; D003056:Cochlear Nerve / Q000502:physiology; D017097:Electric Impedance; D004558:Electric Stimulation; D004567:Electrodes, Implanted; D005260:Female; D006309:Hearing / Q000502:physiology*; D006319:Hearing Loss, Sensorineural / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D013067:Speech Perception / Q000502:physiology*; D016896:Treatment Outcome; D055815:Young Adult