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[1]. 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[2][3][4] (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[5].
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- ^ McBride, David; Williams, Sheila (2001-01-01). "Characteristics of the audiometric notch as a clinical sign of noise exposure". Scandinavian Audiology. 30 (2): 106–111. doi:10.1080/010503901300112211. ISSN 0105-0397. PMID 11409787.
- ^ Coles, R.r.a.; Lutman, M.e.; Buffin, J.t. (2000-08-01). "Guidelines on the diagnosis of noise-induced hearing loss for medicolegal purposes". Clinical Otolaryngology & Allied Sciences. 25 (4): 264–273. doi:10.1046/j.1365-2273.2000.00368.x. ISSN 1365-2273.
- ^ Jansen, E. J. M.; Helleman, H. W.; Dreschler, W. A.; Laat, J. A. P. M. de (2008-04-11). "Noise induced hearing loss and other hearing complaints among musicians of symphony orchestras". International Archives of Occupational and Environmental Health. 82 (2): 153–164. doi:10.1007/s00420-008-0317-1. ISSN 0340-0131.
- ^ Wilson, Richard h.; McArdle, Rachel. "Characteristics of the audiometric 4,000 Hz notch (744,553 veterans) and the 3,000, 4,000, and 6,000 Hz notches (539,932 veterans)" (PDF). The Journal of Rehabilitation Research and Development. 50 (1). doi:10.1682/jrrd.2011.11.0225.
- ^ McBride, David; Williams, Sheila (2001-01-01). "Characteristics of the audiometric notch as a clinical sign of noise exposure". Scandinavian Audiology. 30 (2): 106–111. doi:10.1080/010503901300112211. ISSN 0105-0397. PMID 11409787.