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KMID : 0361020000430040363
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Korean Journal of Otolaryngology - Head and Neck Surgery
2000 Volume.43 No. 4 p.363 ~ p.368
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Distortion Product and Spontaneous Otoacoustic Emissions in Normal Neonates
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Chang Sun-O
Oh Seung-Jun
Koo Ja-Won
Lim Duk-Hwan
Hwang Chan-Ho
Kim Chong-Sun
Choi Jung-Hwan
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Abstract
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Background and Objectives : Distortion Product otoacoustic emission (DPOAE) offers an alternative to
transiently evoked OAE as a neonatal hearing screening, and may provide frequency specific information
of the cochlea. The purpose of this study is to establish the relevant characteristics of spontaneous OAE
(SOAE) and DPOAE of neonates and their efficacy as a neonatal screening method for hearing loss.
Materials and Methods : From July to September 1999, 72 healthy newborns (144 ear) were included in
this study and test was performed within 3 days after birth at nursery. DP audiogram, input/output (I/O)
curve at 3 kHz, and SOAE were recorded.
Results : The DP audiogram had characteristics with two broad peaks of amplitude at Fe (geometric
mean of two primaries) frequencies of 3 kHz and 6 kHz. From the Fe near 3 and 6 kHz, DPOAE was
found over 95% of 144 ears. Median threshold of 3 kHz I/O curve was 40 dB. The threshold in 3 kHz
could be obtained even in 7 ears that had failed to pass DP audiogram. The thresholds of the ears that
failed in DP audiogram were not statistically different from those that passed the test. The amplitude in
DP audiogram was not correlated with the threshold in 3 kHz I/O curve. The positive rate for SOAE was
45% (39% in male, 53% in female, 51% in right ear, 38% in left ear, respectively). All the SOAE positive
cases passed DP audiogram test.
Conclusions : DPOAE has a potential for neonatal screening test for hearing loss. Near 3 kHz and 6 kHz,
DPOAE were highly positive, and these frequencies can be used in screening test. The duration of a
diagnostic test would be shorter by excluding certain frequencies. Using the 3 kHz I/O curve in addition
to DP audiogram may increase the validity and the efficacy of the test. SOAE has limitations as a single
modality of neonatal screening test for hearing loss.
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KEYWORD
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Neonate, Screening test, Hearing loss, SOAE, DPOAE
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