Spontaneous otoacoustic emissions in humans with endolymphatic hydrops

Citation
Si. Haginomori et al., Spontaneous otoacoustic emissions in humans with endolymphatic hydrops, LARYNGOSCOP, 111(1), 2001, pp. 96-101
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Otolaryngology
Journal title
LARYNGOSCOPE
ISSN journal
0023-852X → ACNP
Volume
111
Issue
1
Year of publication
2001
Pages
96 - 101
Database
ISI
SICI code
0023-852X(200101)111:1<96:SOEIHW>2.0.ZU;2-K
Abstract
Objective/Methods: The origin and clinical implications of spontaneous otoa coustic emissions (SOAEs) have not been well revealed. To investigate the r elationship between the ear with endolymphatic hydrops and SOAE, SOAEs were measured in 31 patients with unilateral endolymphatic hydrops and 10 volun teers with normal hearing levels that had less than 25 dB hearing level (HL ) on average for five frequencies (0.25, 0.5, 1, 2, and 4 kHz). Results: SO AEs were detected in 18 (58%) of the 31 ears with hydrops, In 15 hydropic e ars in which the hearing levels were less than 25 dB HL on average, SOAEs w ere observed in 11 (73%). The results of examining the relationship between changes in hearing level after administering the glycerol test and SOAE fr equency showed that four (50%) of eight hydropic ears had SOAEs that were d etectable between the frequency in which hearing level improved more than 5 dB and the frequency with no hearing level change in the audiogram, In 28 contralateral ears, except for three cases of delayed endolymphatic hydrops , SOAEs were detected in 17 (61%). In 14 contralateral ears in which the he aring levels were less than 25 dB HL on average for the five frequencies no ted above, SOAEs were observed in nine ears (64%). In 20 normal ears, SOAEs were detected in eight (40%). Prevalence of SOAEs in hydropic ears and con tralateral ears of the patients with unilateral hydrops tended to be greate r than that in normal ears; however, there was no significant statistical d ifference between them. Conclusion: The present results suggest that it is not possible to mention the characteristics of SOAE in the hydropic ear onl y in terms of the prevalence of SOAEs. SOAEs may occur in a specific portio n of the basilar membrane corresponding to the frequency in which hearing l evels improve after the glycerol test, in some cases with endolymphatic hyd rops.