Pure-tone audiometry and auditory brainstem responses in noise -induced deafness

Author(s): Kaga, K., Nishimura, K.

Journal/Book: Amer J Otolaryngol. 1996; 17: Independence Square West, Curtis Center, Ste 300, Philadelphia, PA 19106-3399. W B Saunders Co. 31-35.

Abstract: Purpose: The objective of this study is to find the relationship between pure-tone audiometry results and the auditory brainstem response wave abnormalities. Subjects and Methods: The pure-tone audiometry (PTA) and auditory brainstem responses (ABRs) from 22 patients (44 ears) with diagnosed noise-induced permanent hearing loss were studied. Three indices of PTA were average thresholds of 0.5 kHz/, /1 kHz, and 2 kHz (PTA1); 2 kHz and 4 kHz (PTA2); and 4 kHz (PTA3) were subdivided into 3 thresholds of hearing. Their relationships with ABR results were analysed, The patterns of PTA from various groups of ABR wave patterns were studied. Results: In this study, the abnormal ABR wave patterns were detected in 72.7% of the ears, The ears with prolonged ABR wave latency, absent early waves, prolong interpeak wave I-V latency was 20.5%, 18.2%, and 21.1%, respectively. Normal ABRs were recorded in 27.3% of the ears despite marked thresholds elevation of the PTA at high frequencies. Other relationships between PTA results and ABR wave results were discussed. Conclusion: There were relationships between severity of noise-induced hearing loss indicated by PTA and the patterns of ABR wave abnormalities among workers with noise-induced permanent hearing loss.

Note: Article S Noorhassim, Natl Univ Malaysia, Fac Med, Dept Community Hlth, Jalan Raja Muda, Kuala Lumpur 50300, Malaysia

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