Infant Air and Bone Conduction Tone Burst Auditory Brain Stem Responses for Classification of Hearing Loss and the Relationship to Behavioral Thresholds

Abstract

AC- and BC-TBABR results can be readily obtained in young infants under natural sleep and were used to classify the type of HL based on the absolute threshold and the size of the ABG. Differences in wave V latency functions for TBABR by AC and BC and wave I and V latencies of the high-level click ABR also distinguish between infants with and without TBABR ABGs. Ear-specific behavioral responses can be obtained at levels under 20 dB HL in normal-hearing infants younger than 1 yr using VRA, and these behavioral thresholds correlate well with TBABR thresholds obtained on average 6.5 mo previously in this population. The current results suggest that protocols for obtaining AC- and BC-TBABR and behavioral thresholds that meet guidelines for early intervention are clinically feasible.

Potencial evocado auditivo de tronco encefálico por frequência específica por via aérea e via óssea em neonatos ouvintes normais

“…This finding corroborate several studies 14,[16][17][18][19][20] , in which the mean MRL were different from the present study by less than 10 dB. A meta-analysis and a study conducted in 2007 both showed lower MRL -19.6 and 18.4 dBnHL, respectively 11,21 .…”

“…At the intensity of 30 dBnHL, some studies have found mean latencies similar to those in the present study 18,20,35 . In the frequency of 1000 Hz, at 80 dBnHL, the latency time was 8.61±0.38 ms, shorter than the results of another study conducted in Brazil frequency suggest responses at intensities lower than 20 dBnHL 10,14,[19][20][21][22] . However, in the present research, the newborns were in natural sleep and not sedated, as in some o these previous studies, which justified the option for the minimum intensity level of 20 dBnHL, as previously described in the methods.…”

“…In literatures, the MRL varied in this frequency. Some studies 10,19,21 have observed MRL lower than 20 dBnHL while others have found MRL between 25 and 35 dBnHL for this frequency 20,23 . In the present research, the minimum intensity considered was 20 dBnHL.…”

“…Some studies have found MRL below 20 dBnHL 10,14,[19][20][21] . A Brazilian study from 2009 found a mean MRL of 32.5 dBnHL in the right ear, and 32.2 dBnHL in the left ear.…”

Potencial evocado auditivo de tronco encefálico por condução óssea: uma revisão integrativa

“…A minimum of two recordings per intensity were used to determine wave reproducibility, and provide more test reliability. diagnosis, primarily in characterizing hearing loss 4,6,28,34 .…”