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Otoacoustic emissions and brainstem auditory evoked potentials in children with neurological afflictions
C Ferber-Viart1, R Duclaux, C Dubreuil
1Service d'Exploration Neurosensorielle, Hôpital Debrousse, Lyon, France.
Insights
Evoked otoacoustic emissions (EOAEs) are consistently present in children with normal brainstem auditory evoked potentials (BAEPs). Absence of EOAEs often indicates cochlear or middle ear damage, while their presence suggests retrocochlear damage in pediatric hearing loss.
Area of Science:
- Audiology
- Neuroscience
- Pediatrics
Background:
- Pediatric hearing loss diagnosis relies on audiological and neurological assessments.
- Brainstem auditory evoked potentials (BAEPs) evaluate the auditory pathway from the cochlea to the brainstem.
- Evoked otoacoustic emissions (EOAEs) assess cochlear outer hair cell function.
Purpose of the Study:
- To investigate the diagnostic utility of EOAEs in conjunction with BAEPs for childhood hearing loss.
- To differentiate between cochlear, middle ear, and retrocochlear pathologies using combined audiological tests.
Main Methods:
- EOAEs and BAEPs were recorded in 22 children with neurological conditions and abnormal BAEPs (41 ears).
- Analysis focused on the correlation between EOAE presence/absence and BAEP findings indicating different types of auditory damage.
Main Results:
- EOAEs were always present in children with normal BAEPs.
- Absence of EOAEs correlated with middle ear (transmission) or cochlear (endocochlear) damage.
- EOAEs were consistently present in cases diagnosed with retrocochlear damage via BAEPs.
Conclusions:
- Combined EOAE and BAEP testing provides precise etiological diagnosis for pediatric hearing loss.
- The presence of EOAEs when BAEP waves are unidentifiable strongly indicates retrocochlear damage.
Abstract:
Findings are reported for evoked otoacoustic emissions (EOAEs) recorded from 22 children with neurological afflictions, whose brainstem auditory evoked potentials (BAEPs) were pathological on at least one side (41 ears explored). Our results confirmed that EOAEs are always present in children and infants having normal BAEPs. Absence of EOAE (n = 22) was almost always related to middle ear or cochlear damage with BAEPs indicating diagnoses, respectively, of transmission damage (n = 7) or endocochlear damage (n = 16). Conversely, for BAEP diagnoses of retrocochlear damage (n = 12), EOAEs were always present. EOAEs associated with BAEPs, therefore, appear to offer a well-adapted technique for precise etiological diagnosis of childhood hearing loss. When no wave is identifiable by BAEP recording, EOAE presence indicates retrocochlear damage.