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Modified
version of Nakashima's classification was used to identify the pattern of hearing loss. High-frequency hearing loss (the difference between the average hearing losses at 4 kHz and 8 kHz exceeds the average hearing losses at 250 Hz and 500 Hz by 30 dB or more) Low-frequency hearing loss (the difference between the average hearing losses at 250 Hz and 500 Hz exceeds the average hearing losses at 4 kHz and 8 kHz by 30 dB or more) "Flat-type" hearing loss (there is approximately equal hearing losses at each frequency) Profound hearing loss (there is scaling-out, - i.e. no response from the patient at the audiometer's maximum intensity - at two or more frequencies) "Other" hearing loss Reference: Nakashima T, et al. Laryngoscope 1993;103:1145-49. |