title: The Role of Electrode Placement in Bilateral Simultaneously Cochlear-Implanted Adult Patients.
abstract: To evaluate the influence of the electrode placement on hearing performance in adult patients who were simultaneously and bilaterally cochlear implanted.
  
  
  
  Case series with planned data collection.
  
  
  
  Tertiary referral university centers.
  
  
  
  The postoperative computed tomography scan was studied for 19 patients who were simultaneously and bilaterally implanted with a long straight electrode array. The size of the cochlea was measured in consideration of the major cochlear diameter and cochlear height. The electrode-to-modiolus distance for the electrodes positioned at 180 and 360 degrees and the angular depth of insertion of the array were also measured. Speech perception was assessed at 1 and 5 years postimplantation with disyllabic word lists in quiet and in noise, with the speech coming from the front and a background noise (cocktail party) coming from 5 loudspeakers.
  
  
  
  At 1 year postimplantation, the electrode-to-modiolus distance at 180 degrees was correlated with the speech perception scores in both quiet and noise. In patients with a full electrode insertion, no correlation was found between the angular depth of insertion and hearing performance. The speech perception scores in noise gradually declined as a function of the number of inserted and active electrodes. No relationship between electrode position and speech perception scores was found at 5 years postimplantation.
  
  
  
  In adult patients who were simultaneously and bilaterally implanted, the use of a long straight array, the full electrode array insertion, and the proximity to the modiolus might be determining factors to obtain the best speech performance at 1 year, without influence on the speech perception scores after long-term use.
authors.affiliation: AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Unité Otologie, Implants auditifs et Chirurgie de la base du crâne, 75013, Paris, France Sensory Organs Department, Sapienza University of Rome, Rome, Italy.
authors.forename: Daniele
authors.initials: D
authors.lastname: De Seta
authors.affiliation: AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Unité Otologie, Implants auditifs et Chirurgie de la base du crâne, 75013, Paris, France UMR-S 1159 Inserm / Université Paris 6 Pierre et Marie Curie, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Nguyen
authors.affiliation: Service ORL, Hôpital Pellegrin, Bordeaux, France.
authors.forename: Damien
authors.initials: D
authors.lastname: Bonnard
authors.affiliation: AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Unité Otologie, Implants auditifs et Chirurgie de la base du crâne, 75013, Paris, France UMR-S 1159 Inserm / Université Paris 6 Pierre et Marie Curie, France.
authors.forename: Evelyne
authors.initials: E
authors.lastname: Ferrary
authors.affiliation: Service ORL, Hôpital Pontchailloux, Rennes, France.
authors.forename: Benoit
authors.initials: B
authors.lastname: Godey
authors.affiliation: Service ORL, Hôpital Bretonneau, Tours, France.
authors.forename: David
authors.initials: D
authors.lastname: Bakhos
authors.affiliation: Service ORL, Hôpital Gui de Chauliac, Montpellier, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Mondain
authors.affiliation: Service ORL, Hôpital Purpan, Toulouse, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Deguine
authors.affiliation: AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Unité Otologie, Implants auditifs et Chirurgie de la base du crâne, 75013, Paris, France UMR-S 1159 Inserm / Université Paris 6 Pierre et Marie Curie, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Sterkers
authors.affiliation: AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Unité Otologie, Implants auditifs et Chirurgie de la base du crâne, 75013, Paris, France UMR-S 1159 Inserm / Université Paris 6 Pierre et Marie Curie, France.
authors.forename: Daniele
authors.initials: D
authors.lastname: Bernardeschi
authors.affiliation: AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Unité Otologie, Implants auditifs et Chirurgie de la base du crâne, 75013, Paris, France UMR-S 1159 Inserm / Université Paris 6 Pierre et Marie Curie, France isabelle.mosnier@aphp.fr.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Mosnier
mesh_terms: D000328:Adult; D000368:Aged; D019929:Cochlear Implantation / Q000379:methods*; D003054:Cochlear Implants; D004567:Electrodes, Implanted; D005260:Female; D006320:Hearing Tests; D006801:Humans; D008297:Male; D008875:Middle Aged; D013067:Speech Perception; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
keywords: angular depth of insertion; bilateral implantation; cochlear implant; cochlear size; electrode position; speech perception