Cochlear Implantation in Cases of Asymmetric Hearing Loss: Subjective Benefit, Word Recognition, and Spatial Hearing.

The study reports all participants receiving the implant and does not describe a randomised control group, so it cannot show what would have happened without implantation. Only 20 participants were studied, and all were aged 52 to 79 years, so the results may not apply to younger adults. One participant withdrew after 6 months, two missed the 9-month test, and two missed the BCHA condition at 12 months. Participants wore the implant for variable hours, and datalogging showed only 10 of 20 wore it for 8 or more hours per day. The comparison with unilateral hearing loss data is confounded because the asymmetric group was older and had more hearing loss in the better ear. The paper reports several goals rather than naming one primary outcome, and post hoc tests were not adjusted for multiple comparisons. Inclusion required prior use of a hearing aid or related device, native English, passing cognitive screening, and limited tinnitus, so it may not apply to all candidates. The implant was tested with a hearing aid in the better ear and with aural rehabilitation, so the contribution of any single component cannot be separated.

The paper lists MED-EL Corporation as the funder. No author conflict-of-interest declaration is included in the supplied text.

Do not conclude that the cochlear implant alone caused the improvements. The everyday listening, localization, and sentence-in-noise results were measured while participants also wore a hearing aid in the better ear, and they had aural rehabilitation sessions, so the effect of the implant alone cannot be separated.