Auditory evoked potentials in premature and full-term infants

Abstract

Accurat e 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. Aim:To analyze the clinical applicability of TB ABR and ASSR at 2 kHz in infants, comparing responses in full-term and premature neonates. Material and Method: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. Results: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. Conclusions: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. Braz J Otorhinolaryngol. 2011;77(5):622-7. BJORL ORIGINAL ARTICLE

A influência da proporcionalidade corporal em crianças nascidas pequenas para a idade gestacional: estudo da maturação da via auditiva

“…The results of the present study showed the lack of asymmetry between the ears in the evaluated groups, in contrast with a study that found higher wave V amplitude and lower BAEP wave latency in the right ear, suggesting that the right ear is favored in auditory processing along the auditory pathway (15) . Our results are consistent with the current literature, concluding that the maturational process along the central auditory pathways occurs simultaneously in both ears (16)(17)(18)(19) . During the neonatal period, the comparison between the AGA and SGA groups (Table 1) showed no differences, except for wave I, which was significantly more precocious in the AGA group.…”

“…The preparation of all NBs for BAEP testing was conducted as follows: prior cleaning of the skin with abrasive paste and fixation of Kendal® Meditrace-200 disposable pediatric electrodes on the forehead (Fpz) and the right and left mastoids (M 2 and M 1 ), according to the International Electrode Systems standards (IES [10][11][12][13][14][15][16][17][18][19][20]. The acoustic stimulus was presented by a pair of ER-3A insertion earphones, eliciting the responses.…”

Potenciais evocados auditivos corticais em neonatos nascidos a termo e pré-termo

“…Other researchers have observed influence of age in the amplitude and latency responses in humans (27) . Using the BAEP, some authors concluded that there is no difference in hearing development between the right and left ears, which occurs simultaneously (9,(28)(29)(30) . Such findings are similar to those of the present study, considering that no statistically significant difference was found between the ears for the latency values of the components P1 and N1, as well as there were no significant results when comparing the presence and absence of the components P2 and N2 between the ears and the groups surveyed.…”

Efeitos da prematuridade na aquisição da linguagem e na maturação auditiva: revisão sistemática

“…Some of the studies verified impairments related to language outcomes in premature children, these having presented compromised language in relation to full-term children (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32) . A study (19) also found association with hearing impairment.…”

“…One of the papers (31) sought to investigate the clinical applicability, in premature and full-term infants, of auditory brainstem evoked potential with tone burst stimulus (ABEP TB) and auditory steady-state response (ASSR) at 2 kHz, and another one (37) examined the auditory pathway through transient evoked otoacoustic emissions (EOAE-T). Significant differences were observed in the duration of ASSR and at 3 kHz and 4 kHz frequency bands in the EOAE-T.…”