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Assessing auditory function in neonates using ipsilateral suppression of transient evoked otoacoustic emissions

Falkman Johnsson, Lovisa (2012)
Logopedics, Phoniatrics and Audiology
Abstract
The present study investigated suppression of transient evoked otoacoustic emissions (TEOAEs) in neonates with an ipsilateral noise suppressor method using a forward masking paradigm. Participants were 26 full-term neonates (36-42 weeks gestational age) with a mean gestational age of 39.7 weeks (SD = 1.4 weeks) and mean chronological age of 1.96 days (SD = 0.8 day). Their mean birth weight was 3.4 kg (SD = 0.5 kg). Only one ear in each neonate was tested. The TEOAE spectra obtained were analysed using the Kresge EchoMaster program comparing assessments with and without noise suppressor. The results show a prevalence of suppression in 85% of the neonates when suppression in at least one frequency band was counted. The mean suppression... (More)
The present study investigated suppression of transient evoked otoacoustic emissions (TEOAEs) in neonates with an ipsilateral noise suppressor method using a forward masking paradigm. Participants were 26 full-term neonates (36-42 weeks gestational age) with a mean gestational age of 39.7 weeks (SD = 1.4 weeks) and mean chronological age of 1.96 days (SD = 0.8 day). Their mean birth weight was 3.4 kg (SD = 0.5 kg). Only one ear in each neonate was tested. The TEOAE spectra obtained were analysed using the Kresge EchoMaster program comparing assessments with and without noise suppressor. The results show a prevalence of suppression in 85% of the neonates when suppression in at least one frequency band was counted. The mean suppression effect was small (< 0.5 dB) across all frequency bands from 1 to 4 kHz and time windows from 8 to 18 msec, with large variations in suppression amplitude (SD = 1.4-2.4 dB). Three different patterns of suppression were found, with 91% and 9% of neonates demonstrating suppression effects in the 1-3 kHz and 3.5-4 kHz frequency ranges, respectively. A significant negative correlation was found between suppression amplitude and birth weight. The suppression amplitude was negatively correlated to ambient noise, although the correlation was not significant at the 0.05 level. The presence of robust spontaneous otoacoustic emissions (SOAEs) could influence TEOAE suppression amplitude, resulting in reverse suppression. The present study found that males showed greater suppression in left ears and females showed greater suppression in right ears. However, this finding should be interpreted with caution in view of the small sample size of the study. Further research using a large sample size is required to confirm these findings and establish normative data for the neonatal population. (Less)
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author
Falkman Johnsson, Lovisa
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
Transient evoked otoacoustic emissions, Ipsilateral suppression, Neonates, Newborn, Efferent System, Medial olivocochlear bundle
language
English
id
3167075
date added to LUP
2012-11-12 19:01:31
date last changed
2012-11-12 19:03:14
@misc{3167075,
  abstract     = {The present study investigated suppression of transient evoked otoacoustic emissions (TEOAEs) in neonates with an ipsilateral noise suppressor method using a forward masking paradigm. Participants were 26 full-term neonates (36-42 weeks gestational age) with a mean gestational age of 39.7 weeks (SD = 1.4 weeks) and mean chronological age of 1.96 days (SD = 0.8 day). Their mean birth weight was 3.4 kg (SD = 0.5 kg). Only one ear in each neonate was tested. The TEOAE spectra obtained were analysed using the Kresge EchoMaster program comparing assessments with and without noise suppressor. The results show a prevalence of suppression in 85% of the neonates when suppression in at least one frequency band was counted. The mean suppression effect was small (< 0.5 dB) across all frequency bands from 1 to 4 kHz and time windows from 8 to 18 msec, with large variations in suppression amplitude (SD = 1.4-2.4 dB). Three different patterns of suppression were found, with 91% and 9% of neonates demonstrating suppression effects in the 1-3 kHz and 3.5-4 kHz frequency ranges, respectively. A significant negative correlation was found between suppression amplitude and birth weight. The suppression amplitude was negatively correlated to ambient noise, although the correlation was not significant at the 0.05 level. The presence of robust spontaneous otoacoustic emissions (SOAEs) could influence TEOAE suppression amplitude, resulting in reverse suppression. The present study found that males showed greater suppression in left ears and females showed greater suppression in right ears. However, this finding should be interpreted with caution in view of the small sample size of the study. Further research using a large sample size is required to confirm these findings and establish normative data for the neonatal population.},
  author       = {Falkman Johnsson, Lovisa},
  keyword      = {Transient evoked otoacoustic emissions,Ipsilateral suppression,Neonates,Newborn,Efferent System,Medial olivocochlear bundle},
  language     = {eng},
  note         = {Student Paper},
  title        = {Assessing auditory function in neonates using ipsilateral suppression of transient evoked otoacoustic emissions},
  year         = {2012},
}