الفهرس 
Title : Narrow band CE-chirp stimulus in auditory steady state response threshold in normal hearers and patients with various degrees of sensorineural hearing loss
AbstractOnly 14 pages are availabe for public view
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Abstract
Background: Auditory steady-state responses (ASSRs) are periodic scalp potentials that arise in response to auditory stimuli. Narrow band (NB) CE-Chirps stimuli have been developed to combine the advantages of compensation for the cochlear traveling wave delay and frequency specificity. Methods: In the present study, 35 subjects (70 ears) were enrolled. Ears were grouped according to the degree of hearing obtained by pure tone audiometry (PTA) into 7 groups of 5 patients each (10 ears). NB-CE-chirp ASSR was done for all groups by means of auditory evoked potential. Objectives: To measure the ASSR thresholds detected by NB CE-chirp in different degrees of sensorineural hearing loss (SNHL) and its comparison to threshold detected by PTA. Results: The estimated audiograms configuration matched the behavioral curves. There was no statistically significant correlation between behavioral PTA threshold air conduction (AC) and either PTA-ASSR differences or PTA-Estimated audiograms threshold difference. The AC PTA-ASSR thresholds difference among all subgroups was not statistically significant in either ear which reflects that the ASSR was equally accurate in measuring air conduction thresholds for all degrees of hearing loss. The PTA-ASSR threshold difference was less for bone conduction (BC) than AC at 500, 1000, 4000 HZ in both ears at all tested degrees of hearing loss, and this was statistically significantly in most of the frequencies; which reflects that the ASSR was more accurate in measuring bone conduction thresholds than the AC