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KMID : 0361020100530030143
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Korean Journal of Otolaryngology - Head and Neck Surgery
2010 Volume.53 No. 3 p.143 ~ p.147
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The Relationship between the Change of Otoacoustic Emission and Temporary Threshold Shift after Broad Band Noise Stimulation
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Lee Duk-Gyu
Lee Jae-Eun
Goh Eui-Kyung
Lee Il-Woo
Kong Soo-Keun
Chon Kyong-Myong
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Abstract
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Background and Objectives: A distortion product otoacoustic emission (DPOAE) is a noninvasive method which is commonly used to assess the hearing function of the cochlea and to reflect objective information of specific frequency in the cochlea. We hypothesize that after applying a broad band noise (BBN), the outer hair cell’s function will change and cause reduction in the amplitude of DPOAEs and signal to noise ratio (SNR).
Subjects and Method: We performed the examination on 40 subjects (80 ears) who have a normal hearing function. DPOAEs were recorded before and after BBN stimulation (intensity: 90 dB HL, duration: 10 minutes).
Results: After the BBN stimulation, the amplitude of DPOAEs and SNR were decreased at all frequencies. The amplitude of DPOAEs and SNR decreased 0.3-1.6 dB SPL, 0.6-1.5 dB SPL, respectively. Decreases in the amplitude had statistical significances after 3 and 6 minutes in 1 kHz, 3 and 6 minutes in 2 kHz, immediately after noise exposure, and after 3 and 6 minutes in 6 kHz. However, the SNR changes had statistical significance only after 3 minutes in 1 kHz. After the stimulation, pure tone threshold at 4 kHz increased 3.2±3.9 dB HL. After the BBN exposure, the amplitude of DPOAEs and SNR decreased at all frequencies and most of them recovered within 12 minutes.
Conclusion: These results suggest that DPOAE could be a clinically useful method for the purpose of screening, managing and assessing the prognosis of acoustic trauma and noise induced sensorineural hearing loss.
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KEYWORD
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Otoacoustic emissions, Noise, Auditory fatigue
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