The Merits of Bilateral Application of Middle Ear Implants in Patients With Bilateral Conductive and/or Mixed Hearing Loss.
Martijn J H Agterberg, Louise Straatman, Karl-Ludwig Bruchhage and 3 others
PMID 39106413WHAT IT FOUND
Four of six adults with bilateral conductive hearing loss localized sounds accurately when using two middle ear implants.
Their error rates were similar to normal hearing. Two patients only lateralized sounds, possibly due to implant differences or short usage time.
Key findings
01Four of the six patients demonstrated accurate sound localization in the bilateral aided condition, with head-movement endpoints close to the target direction.
02The mean absolute error for bilateral middle ear implant users was 16 degrees, which is significantly lower than the 37 degrees seen in bilateral bone-conduction device users.
03The bilateral implant error rate was close to the range of normal-hearing listeners, who had a mean absolute error of 9 degrees.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only six patients, making it a small case series rather than a controlled trial. The comparison group using bone-conduction devices consisted of children, while the implant group was mostly adults, introducing age and developmental differences. The implant group had mild-to-moderate sensorineural hearing loss, whereas the bone-conduction group had normal bone conduction thresholds. Speech understanding in noise, a critical functional outcome, was not measured. Two patients did not achieve accurate localization, and the reasons (implant coupling differences or short usage time) are speculative.
Declared interests
The authors declared no potential conflicts of interest and received no financial support for the research.
The easy way to misread this
Do not assume that bilateral middle ear implants improve speech understanding in noise. This study only measured sound localization, and the authors explicitly state that the ability to understand speech in noisy environments needs further investigation.