The maturational process of the auditory system in the first year of life characterized by brainstem auditory evoked potentials
J. appl. oral sci
;
17(spe): 57-62, 2009. graf, tab
Article
in English
| LILACS
| ID: lil-576856
ABSTRACT
The study of brainstem auditory evoked potentials (BAEP) allows obtaining the electrophysiological activity generated in the cochlear nerve to the inferior colliculus. In the first months of life, a period of greater neuronal plasticity, important changes are observed in the absolute latency and inter-peak intervals of BAEP, which occur up to the completion of the maturational process, around 18 months of life in full-term newborns, when the response is similar to that of adults. OBJECTIVE:
The goal of this study was to establish normal values of absolute latencies for waves I, III and V and inter-peak intervals I-III, III-V and I-V of the BAEP performed in full-term infants attending the Infant Hearing Health Program of the Speech-Language Pathology and Audiology Course at Bauru School of Dentistry, Brazil, with no risk history for hearing impairment. MATERIAL ANDMETHODS:
The stimulation parameters were rarefaction click stimulus presented by the 3ª insertion phone, intensity of 80 dBnHL and a rate of 21.1 c/s, band-pass filter of 30 and 3,000 Hz and average of 2,000 stimuli. A sample of 86 infants was first divided according to their gestational age in preterm (n=12) and full-term (n=74), and then according to their chronological age in three periods P1 0 to 29 days (n=46), P2 30 days to 5 months 29 days (n=28) and P3 above 6 months (n= 12).RESULTS:
The absolute latency of wave I was similar to that of adults, generally in the 1st month of life, demonstrating a complete process maturity of the auditory nerve. For waves III and V, there was a gradual decrease of absolute latencies with age, characterizing the maturation of axons and synaptic mechanisms in the brainstem level.CONCLUSION:
Age proved to be a determining factor in the absolute latency of the BAEP components, especially those generated in the brainstem, in the first year of life.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Auditory Perception
/
Evoked Potentials, Auditory, Brain Stem
Type of study:
Etiology study
/
Incidence study
/
Observational study
/
Prevalence study
/
Risk factors
Limits:
Humans
/
Infant
/
Infant, Newborn
Language:
English
Journal:
J. appl. oral sci
Journal subject:
Dentistry
Year:
2009
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
University of São Paulo/BR
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