Otoacoustic emissions in normal and hearing‐impaired children and normal adults

Abstract

Although distortion-product otoacoustic emissions (DPOEs) have been studied in adults recently, there is little information regarding them in young children. DPOEs and click-evoked otoacoustic emissions (CEOEs) were measured from a same group of normal and hearing-impaired children (age 4 through 10 years) and normal adults (age 22 through 29 years). Measurements of DPOEs in 13 children's ears with normal hearing showed higher levels of emissions in the 700- to 1400-Hz and 5.7-kHz regions relative to the data obtained in 10 normal adult ears. The 22 ears of children with sensorineural hearing loss demonstrated agreement between pure-tone audiograms and "DPOE audiograms." Measurements of CEOEs revealed that the average level of emission in 15 normal-hearing children's ears was slightly lower than that previously obtained in newborns, but slightly higher than that of adults. In children, the CEOE spectral components in the 4- to 6-kHz region were lower than in newborns, but higher than in adults. These results support the view that the DPOEs and CEOEs comprise a valuable tool in assessment of cochlear function in subjects of all ages.

A retrospective study of the spectral probability of spontaneous otoacoustic emissions: Rise of octave shifted second mode after infancy

“…A level peak close to 4 kHz was not observed. Data from 15 ears of children, aged 4-10 years (Spektor et al, 1991), showed that CEOAE prevalence in the 4.5-6 kHz range was intermediate between that of neonates and adults. Smurzynski and Kim (1992) calculated the median CEOAE level vs. frequency from the data of 30 adult ears (age 21-30 years).…”

Otoacoustic Emissions in Young Children with Autism

“…The mean ages of the children in the other studies were 9.5 years [6] , 5.7 years [12] , 10.6 years [17] , and 8.9 years [21] . Studies that included typically developing cases found that TEOAE amplitudes were higher in the first year of life [30,31] . Studies also showed that the DPOAE responses of children aged 1-3 years were higher than those of teenagers and that amplitudes fell much more rapidly in the first 6 years of life than in the subsequent years [32][33][34] .…”

Iron Deficiency Anemia and Hearing

“…Stimuli were generated and DPOAEs were measured using pre viously described procedures [ 17,18], except for the incorporation of insert ear phones and a subminiature microphone system. DPOAEs were elicited for animals with a computer-based, digital-signal pro cessor to generate two equilevel (Li = Li) primary signals at fi and f> frequencies, with f2 being greater than f| by a constant ratio of 1.3.…”

“…The outer hair cell motility presum ably modulates basilar membrane motion to enhance cochlear sensitivity and tuning [14]. Monitoring outer hair cell status has been shown to provide an extremely sensitive index of cochlear damage [15][16][17], One method of monitoring outer hair cell function is via measurement of DPOAEs. The DPOAEs are measured acoustically in the ear canal when two primary tones designated fi and f2 (where the frequency of fi < f2) are presented to the ear simultaneously [18].…”