User guide
BABYS
C
REEN
ECH001XN121-A4 – 07/2022
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Chapter 4. Otoacoustic emission (TEOAE and DP-gram)
4.1 Presentation
By varying the frequencies of the 2 primaries f1 and f2, it is possible to gather together the different distortion products
and establish a curve known as
DP-gram
(a graphic of the distortion products, similar to an audiogram). By observing
the cochlear spectrum, from 1000 Hz to 5kHz, we can estimate the impairment severity of the OHCs and thus estimate
the level of deafness.
This makes the
DP-gram
a simple and fast test which can be reproduced and which, above all, is not invasive. The
presence of PDAs allows us to affirm (when there is no transmissional deafness) the cochlear functionality of the OHCs.
The
DP-gram
study is recommended for the early screening of deafness at the maternity stage, following up infants in
neonatology intensive care units, in pediatric audiological evaluation, in following up abrupt deafness, professional and
toxic deafness.