Auditory evoked potentials in premature and full-term infants

Accurate information about type, degree, and configuration of hearing loss are necessary for successful audiological early interventions. Auditory brainstem response with tone burst stimuli (TB ABR) and auditory steady-state response (ASSR) exams provide this information. To analyze the clinical app...

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Bibliographic Details
Published in:Brazilian journal of otorhinolaryngology 2011-09, Vol.77 (5), p.622-627
Main Authors: de Almeida Porto, Maria Angélica, de Azevedo, Marisa Frasson, Gil, Daniela
Format: Article
Language:English
Subjects:
Acoustic Stimulation
audiometry
Audiometry, Evoked Response - methods
auditory
Auditory Threshold - physiology
Cross-Sectional Studies
evoked potentials
Evoked Potentials, Auditory, Brain Stem - physiology
evoked response
Female
hearing
Humans
infant
Infant, Newborn
Infant, Premature - physiology
Male
Original
OTORHINOLARYNGOLOGY
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Summary:Accurate information about type, degree, and configuration of hearing loss are necessary for successful audiological early interventions. Auditory brainstem response with tone burst stimuli (TB ABR) and auditory steady-state response (ASSR) exams provide this information. To analyze the clinical applicability of TB ABR and ASSR at 2 kHz in infants, comparing responses in full-term and premature neonates. The study was cross-sectional, clinical and experimental. Subjects consisted of 17 premature infants and 19 full-term infants. TB ABR and ASSR exams at 2000 Hz were done during natural sleep. The electrophysiological minimum response obtained with TB ABR was 32.4 dBnHL (52.4 dBSPL); the ASSR minimum was 13.8 dBHL (26.4 dBSPL). The exams required 21.1 min and 22 min, respectively. Premature and full-term infant responses showed no statistically significant differences, except for auditory steady-state response duration. Both exams have clinical applicability at 2 kHz in infants, with 20 min of duration, on average. In general, there are no differences between premature and full-term individuals.
ISSN:1808-8694
1808-8686
1808-8686
DOI:10.1590/S1808-86942011000500015