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J Audiol Otol > Epub ahead of print
DOI: https://doi.org/10.7874/jao.2019.00360    [Epub ahead of print] Published online November 22, 2019.
Better Understanding of Direct Bone-Conduction Measurement: Comparison with Frequency-Specific Bone-Conduction Tones and Brainstem Responses
Yeoju Kim1,2  , Woojae Han1,2,3  , Sihun Park1,2  , Sunghwa You1,2  , Chanbeom Kwak1,2  , Youngjoon Seo4  , Jihyeon Lee1,4 
1Laboratory of Hearing and Technology, College of Natural Sciences, Hallym University, Chuncheon, Korea
2Division of Speech Pathology and Audiology, College of Natural Sciences, Hallym University, Chuncheon, Korea
3Research Institute of Audiology and Speech Pathology, College of Natural Sciences, Hallym University, Chuncheon, Korea
4Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, Wonju, Korea
Correspondence  Woojae Han ,Tel: +82-33-248-2216, Fax: +82-33-256-3420, Email: woojaehan@hallym.ac.kr
Submitted: August 30, 2019  Accepted after revision: October 16, 2019
Background and Objectives
The present study aimed to compare thresholds of direct bone-conduction (BC direct) with those of behaviorally measured BC pure-tone audiometry (PTA) and objectively measured BC auditory brainstem response (ABR) to confirm the clinical feasibility of their relationships.
Subjects and Methods
Young adults with normal hearing participated in the study to determine the thresholds from three measurements at four testing frequencies. In the BC direct, the vibrator of a bone-anchored hearing aid softband was placed on the right mastoid of each subject. In both PTA and ABR, a B71 bone oscillator was placed on the subject’s right mastoid. While the subject’s thresholds of BC direct and BC PTA were determined with a clinically routine 5-dB step procedure, BC ABR was conducted to determine the individual’s hearing sensitivity by a peak V of the waveform using tone-burst and click stimuli.
The BC direct showed a different pattern between low and high frequencies. Precisely, its thresholds were 13.25 and 12.25 dB HL at 0.5 and 1 kHz, respectively, but 19 and 19.75 dB HL at 2 and 4 kHz, respectively. A significant positive correlation existed between BC direct and PTA at 1 kHz, which was also correlated with ABR.
Based on the current data, the thresholds of BC direct were similar to BC PTA at low frequencies and BC ABR at high frequencies. The thresholds of BC direct might be predictable at approximately 5 dB higher (or lower) than that in PTA, although a large data set is required for standardization.
Keywords: Bone-anchored hearing system · Direct bone-conduction · Bone-conduction thresholds · Bone-conduction hearing
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