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KMID : 0858620030070010057
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Korean Journal of Audiology
2003 Volume.7 No. 1 p.57 ~ p.62
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A Comparison of Auditory Steady-State Response Thresholds to Pure Tone Thresholds in Persons with Normal Hearing and Sensorineural Hearing Loss
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Cho Soo-Jin
Lee Jung-Hak
Kim Jin-Sook
Kin Hyung-Jong
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Abstract
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Objective: Recently, auditory steady-state response (ASSR) tests have been developed as a new objective method for estimating hearing level especially. in profound hearing loss. The ASSR is proposed as an alternative to the auditory brainstem response (ABR) and uses continuous stimuli to elicit a response from the auditory system. The goal of this study was to compare ASSR thresholds to pure tone thresholds.
Methods: The subjects included 15 adults with normal hearing and 21 subjects with sensorineural hearing loss (11 adults, 10 children). A clinical audiometer (Interacoustic, AC33 Audiometer) and MASTER system (Bio-logic) was used to evaluate pure tone thresholds and ASSR thresholds. ASSRs were obtained using 100% AM and 20% FM tones at 500, 1000, 2000, 4000 Hz for carrier frequency and at 82 to 99 Hz for modulation frequency.
Results: Results were as follows. Firstly, ASSR thresholds appeared to be higher than pure tone thresholds in total combined subjects. The mean of differences between PTA and ASSR thresholds were 16.4-22.0 dB across frequencies and the largest difference was observed at 500 Hz and the highest correlation was found at 2000 Hz. Secondly, The correlation between ASSR and PTA thresholds was lower in subjects with normal hearing than in subjects with sensorineural hearing loss. Finally, In case of sensorineural hearing loss (adult), the mean of differences across frequencies between PTA and ASSR thresholds were 12.8-26.2 dB and the highest correlation was found at 1000 Hz.
Conclusions:sThe results indicated that the ASSR may provide a useful data for the prediction of behavioral hearing thresholds in subjects with sensorineural hearing loss as well as normal hearing. It also suggested, however that the MASTER technique including the software should be improved to reduce the measuring time which was considerable longer than expected to get the appropriate data.
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KEYWORD
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ASSR, Hearing threshold
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