Cochlear Implantation Among Adults and Older Children with Unilateral or Asymmetric Hearing Loss

  • Study type:

    Interventional What is this?

    Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.

Study IDs

  • Site IRB:

    • Rochester, Minnesota: 13-009050
  • NCT ID:

  • Sponsor Protocol Number:


About this study

Do adults and older children (greater than 7 years of age) with unilateral or assymetric hearing loss benefit from cochlear implantation on the worst hearing side.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria


  • 18 years of age or older,
  • Hearing loss in the ear to be implanted must such that speech understanding is not possible with a well fitted hearing aid. Specifically, less than 40% monosyllabic word understanding when that ear is tested in the best-aided condition and the other ear is sufficiently occluded or masked.
  • Onset of hearing loss in the adult group must be within the past two years for the ear to be implanted.


  • Children 7 years of age and older
  • Hearing loss in the ear to be implanted configured such that word understanding is less 40% in the best aided condition
  • Onset of hearing loss recent within the past two years, and that occurred after the critical period of auditory development; the third year of life (Sharma et al., 2005).

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Douglas Sladen, Ph.D.

Contact us for the latest status

Becky Hughes Borst M.A., CCRP