Abstract：
PURPOSE:Some cochlear implant (CI) patients lose their residual hearing during surgery. Two factors that might play a role in residual hearing loss are the change in intracochlear hydraulic pressure and force on the cochlear wall during electrode insertion. The aim of this study is to investigate whether a difference in peak hydraulic pressure and peak force on the cochlear wall exists during a CI electrode insertion with different insertion techniques. MATERIALS AND METHODS:Twenty fresh frozen temporal bones were used. Hydraulic pressure and force on the cochlear wall were recorded during straight electrode insertions with 1) slow versus fast insertion speed, 2) manual versus automatic insertion method and 3) round window approach (RWA) versus extended RWA (ERWA). RESULTS:When inserting with a slow compared to a fast insertion speed, the peak hydraulic pressure is 239% (95% CI: 130-399%) higher with a RWA and 58% (95% CI: 6-137%) higher with an ERWA. However, the peak force on the cochlear wall is a factor 29% less (95% CI: 13-43%) with a slow insertion speed. No effect was found of opening and insertion method. CONCLUSIONS:As contradictory findings were found for hydraulic pressure and force on the cochlear wall on insertion speed, it remains unclear which insertion speed (slow versus fast) is less traumatic to inner ear structure.
journal_name
Am J Otolaryngoljournal_title
American journal of otolaryngologyauthors
Snels C,Roland JT Jr,Treaba C,Jethanamest D,Huinck W,Friedmann DR,Dhooge I,Mylanus Edoi
10.1016/j.amjoto.2020.102859subject
Has Abstractpub_date
2020-12-29 00:00:00pages
102859issue
2eissn
0196-0709issn
1532-818Xpii
S0196-0709(20)30553-6journal_volume
42pub_type
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