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Year : 2010  |  Volume : 12  |  Issue : 2  |  Page : 55-61

Study of dead regions in the cochlea: New insight for management of auditory neuropathy/dys-synchrony

1 Audiology Unit, Otolaryngology Department, Ain Shams University, Abbassia, Cairo, Egypt
2 Audiology Unit, Otolaryngology Department, Saudi German Hospital, Jeddah, Saudi Arabia
3 Audiology Unit, Olaryngology Department Zagazig University , Zagazig, Egypt

Correspondence Address:
MD Khairy Abul Nasr
Head of ENT Department, Saudi German Hospital, 4 Batterjee Street, P.O.Box 2550, Jeddah 21461
Saudi Arabia
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1319-8491.274633

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Objectives:This research was done to investigate dead regions of the cochlea in auditory neuropathy / dys-synchrony (AN/AD) patients and how much their presence affects the benefit from hearing aids. Methods:Twenty adolescent and adult patients with auditory neuropathy / dys-synchrony (AN/AD) together with a control group of forty age-matched patients with sensory neural hearing loss (SNHL) were examined. Both groups were evaluated for the presence of dead regions of the cochlea by TEN-HL test (Moore et al., 2004) [1]. TEN-HL test demonstrated positive criteria in 95% of ears in AN/AD patients which was mainly at low frequency bands, while 15% had positive TEN-HL test across all the tested frequency range. On the contrary, SNHL patients showed positive TEN-HL test in 16.5% of examined ears mainly in the mid frequency bands. The number of dead regions was negatively correlated to speech recognition. Results:Open hearing aid fitting was tried in AN/AD patients aiming to minimize the masking produced by low frequency dead regions and emphasize the high frequency components of speech. Binaural open hearing aid fitting showed improvement in high frequency detection thresholds that was significantly better than monaural fitting. Benefit from amplification was negatively correlated to the number of dead regions in TEN-HL test. Training of AN/AD patients on the use of these high frequency cues was suggested. Conclusion:Diagnosis of dead regioncan be taken as a guide in hearing aid fittingas well as in cochlear implant programming.

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