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Acta Otolaryngol. 2004 May;124(4):348-52.

Hearing preservation in cochlear implantation for electric acoustic stimulation.

Author information

1
ENT Department, Head and Neck Surgery, Johann Wolfgang Goethe University, Frankfurt am Main, Germany. gstoettner@em.uni-frankfurt.de

Abstract

OBJECTIVE:

To evaluate the possibility of preservation of low-frequency hearing in atraumatic cochlear implant electrode insertion procedures for combined, ipsilateral electric and acoustic stimulation.

MATERIAL AND METHODS:

A total of 21 patients were implanted with a MED EL C40+ cochlear implant using an atraumatic electrode insertion technique to preserve residual low-frequency hearing. Pure-tone audiometric thresholds were measured pre- and postoperatively to evaluate the degree of preserved hearing. Speech discrimination tests in quiet and with background noise were performed in a patient with successful hearing preservation.

RESULTS:

Using the atraumatic electrode insertion procedure with an insertion depth of 360 degrees (18-24 mm), hearing preservation could be achieved in 18/21 patients (85.7%). Three patients (14.3%) lost their residual low-frequency hearing after the implantation. Residual hearing was preserved completely in 13 patients (61.9%) and partial hearing preservation was possible in 5 (23.8%). Preliminary speech discrimination tests showed a dramatic benefit for the combined electric and acoustic stimulation mode compared to cochlear implantation alone.

CONCLUSION:

Preservation of low-frequency hearing in cochlear implantation is possible in patients implanted because of profound high-frequency deafness. With the development of new, more atraumatic electrode designs, preservation of residual hearing should be further improved.

PMID:
15224851
DOI:
10.1080/00016480410016432
[Indexed for MEDLINE]

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