title: Safety, efficacy, and hearing preservation using an integrated electro-acoustic stimulation hearing system.
abstract: OBJECTIVE
  To determine the safety, efficacy, and potential for hearing preservation of an electroacoustic hearing system in patients with severe high-frequency and moderate low-frequency hearing loss.
  
  
  METHODS
  Five patients were included in this study with steeply down-sloping sensorineural hearing loss. All patients had a history of hearing aid use and similar hearing in the contralateral ear. Ages ranged from 48 to 69 years.
  
  
  METHODS
  All participants were implanted with an electro-acoustic stimulation (EAS) device using a hearing preservation technique. This device integrates electric and acoustic stimulation into a single processor for simultaneous ipsilateral bimodal stimulation.
  
  
  METHODS
  Pure-tone audiograms (PTA) and speech reception thresholds (SRTs) during preoperative evaluation; initial cochlear implant (CI) stimulation; initial EAS stimulation; and at 3, 6, and 12 months poststimulation. Consonant-Nucleus-Consonant (CNC) monosyllables preoperatively and at 3, 6, and 12 months poststimulation.
  
  
  RESULTS
  All participants showed preserved hearing in the surgical ear after implantation as measured by PTA and SRT. Significant improvement in speech recognition testing over hearing aid was observed at 3 months with EAS versus 6 months with CI-only stimulation. Facial stimulation occurred in 1 patient and resolved after reprogramming.
  
  
  CONCLUSIONS
  There were no significant complications in this cohort of patients. Adequate hearing preservation was achieved. EAS and CI aided conditions both showed significant improvement over hearing aid with EAS condition achieving significance sooner.
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, U.S.A.
authors.forename: Ahmad F
authors.initials: AF
authors.lastname: Mahmoud
authors.forename: Sean T
authors.initials: ST
authors.lastname: Massa
authors.forename: Stacy L
authors.initials: SL
authors.lastname: Douberly
authors.forename: Michelle L
authors.initials: ML
authors.lastname: Montes
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Ruckenstein
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods*; D000368:Aged; D019929:Cochlear Implantation / Q000009:adverse effects / Q000379:methods; D003054:Cochlear Implants; D005260:Female; D006309:Hearing; D006319:Hearing Loss, Sensorineural / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged