User:Chandramaas/sandbox

Audiometric Notches

Audiometric “notches” are audiogram configurations that indicate noise induced hearing loss. This notch occurs in the high frequencies of 3000, 4000, or 6,000 with a recovery at 8,000 Hz and can often be used as an early indication for NIHL. Peer-reviewed journal articles have many ways of classifying audiometric notches. Several studies indicate that the difference between the threshold at the notch frequency (3-, 4-, or 6 kHz) and the 2 kHz threshold and the difference between threshold at the notch frequency and the 8 kHz threshold are both greater than or equal to 10 dB  (Wilson 2013,, Wilson 2011, hsu 2013, dud 2008). Whereas in some studies, consider a pure tone average of 25dB or greater at 3-, 4-, 6 kHz to be a notched audiogram. Audiometric notches among musicians typically occur at 6000 Hz (emmerich 2007, kahari 2004, jansen 2008), and notches among industrial workers typically occur at 4000 Hz.

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