Effects of XXXX on speech performance with the CI422 and the Hybrid-L electrode.

@entity1 @entity393
UNASSIGNED: Objective Preservation of residual low-frequency hearing has become a priority in cochlear implantation. The purpose of this study was to compare rates of hearing preservation and effects on performance of loss of low-frequency acoustic hearing with two different length electrodes. Study design Retrospective chart review. Setting Tertiary Care Hospital. @entity1 Twelve @entity1 were implanted with the CI422 a slim-straight electrode; the second group consisted of 10 @entity1 implanted with the Hybrid-L, a shorter hearing preservation electrode. Main outcome measure Audiometric thresholds and speech perception measures. Results At 1  year, 3/10 (30%) @entity1 with the Hybrid-L and 7/12 (58%) @entity1 with the CI422 lost residual acoustic hearing resulting in a profound @entity393 in the implanted ear. In comparing these @entity1 in particular, mean CNC words in the implanted ear were 72% in the CI422 electrode group and 15% in the Hybrid-L electrode group at 1  year (P  =  0.03). While hearing preservation rates with the Hybrid-L tended to be better, among recipients who lost residual hearing, speech perception was better in those with the longer CI422 electrode. Conclusions With emphasis on preservation of residual hearing, @entity1 need to be counseled regarding possible outcomes and options should @entity393 occur following implantation. While shorter electrodes may have better rates of hearing preservation, the @entity1 with the longer straight electrode in our study had significantly better speech understanding following the @entity393 .
