Difference in Thresholds Between Auditory Brainstem Response Test and Pure Tone Audiometry by Frequency
10.3342/kjorl-hns.2021.00703
- Author:
Taehun LIM
1
;
Joo Hyung OH
;
Joon Bum JOO
;
Ju Eun CHO
;
Pona PARK
;
Jong Yang KIM
Author Information
1. Department of Otorhinolaryngology, National Police Hospital, Seoul, Korea
- Publication Type:Original Article
- From:Korean Journal of Otolaryngology - Head and Neck Surgery
2023;66(1):7-14
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Background and Objectives:There is no clear standard for the difference in the thresholds of auditory brainstem response (ABR) and pure tone audiometry (PTA) when using ABR to evaluate the reliability of PTA. Therefore, we assessed the difference in the thresholds of ABR and PTA for each frequency. Consequently, we present here the actual difference values between the two tests that can be used as a reference in the clinic.Subjects and Method We retrospectively assessed the audiometry results of 129 ears. Ears in which the hearing thresholds of each frequency continuously declined were classified as the downward group. We compared the average of differences between the two tests by frequency. The differences were compared for each hearing level from 50 dB or higher.
Results:For all ears, the appropriate range of difference value was ±5 dB at 2 kHz. At 1 kHz, the ABR threshold was 10 dB higher than PTA, and it was 10 dB less than PTA at 4 kHz. In the downward group, the difference value increased by 10 dB at 1 kHz and 4 kHz. In the subgroups at each hearing level, the difference value showed similar results (p<0.05).
Conclusion:The difference in the threshold, regardless of the severity or tendency of hearing loss, was the smallest at 2 kHz and the range was ±5 dB. ABR was 10 dB higher at 1 kHz and and 10 dB lower at 4 kHz than PTA. In the downward group, the difference at 1 kHz and 4 kHz increased by 10 dB each.
