Noise induced hearing loss
Noise induced hearing loss refers to the sensorineural hearing loss caused by long-term exposure to noise or high-intensity noise. Noise induced hearing loss can be divided into two categories: one is temporary threshold up shift, that is, hearing loss is temporary, which is common in the short-term exposure to strong noise environment, such as temporary hearing loss after singing in the concert hall. The other is permanent hearing loss, which is often caused by long-term exposure to noise. The second is more harmful than the temporary threshold. This kind of noise hearing loss is permanent sensorineural hearing loss, but once formed, there is no way to restore hearing by medical means. In order to improve the quality of life of patients with severe noise induced hearing loss, hearing aid must be used. Therefore, the most important thing of noise hearing loss is prevention
Teenagers and headphones
At present, more and more young people use earphones. It is reported that 17% of American teenagers have noise induced hearing loss. The longer the time and frequency of listening to songs with headphones, the more serious the degree of hearing loss. The hearing loss caused by wearing headphones is related to the volume used. The higher the volume is, the more serious the hearing loss will be. Tinnitus is easy to occur when listening to music with headphones for more than 3 hours each time. If you listen to music every day and the volume is greater than 85dB (a), your hearing will be reduced by 2. At present, scholars have begun to pay attention to the effect of headphones on hearing loss. The average hearing of young people in Ningxia University who have used earphones for 4 years or more is 15.79dbhl in the right ear and 14.80db HL in the left ear.
Noise induced hearing loss begins with high frequency hearing loss
Research shows that noise induced hearing loss begins with high-frequency hearing loss and forms a notch at 4-6khz. With the application of extended high-frequency in clinical practice, it is found that long-term use of headphones in the early stage will lead to extended high-frequency (9, 10, 11, 13, 14, 15, 16KHz) hearing loss. Extended high frequency refers to the frequency above 8kHz. In the early stage of noise induced deafness, the high frequency part of hearing loss is expanded. Because these frequencies are not within the range of speech frequency, the patients will not feel hearing loss. When further hearing loss occurs in the frequency range of 0.25khz ~ 8kHz, the patient can feel hearing loss and communication disorder. Therefore, extended high-frequency hearing screening can improve the detection rate of noise induced hearing loss. If the high-frequency extended hearing test can be found in time before the decrease of speech frequency, it can prevent the further development of noise induced hearing loss in time, while the hearing loss staying in the extended high-frequency part does not affect daily life, so patients can get a good quality of life.
By detecting whether the extended high frequency of young people who wear earphones for a long time decreases, we can find the trend of hearing loss in the early stage of young people, and timely remind and stop young people to avoid noise exposure and hearing loss within the range of speech frequency. Therefore, it is of great significance to detect extended high frequency hearing loss and prevent noise induced hearing loss in time.
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