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Comparison of auditory steady-state response (ASSR) and tone-burst auditory brainstem response (Tb-ABR) thresholds


Comparison of auditory steady-state response (ASSR) and tone-burst auditory brainstem response (Tb-ABR) thresholds

A study that compare the thresholds of auditory brainstem response (Tb-ABR) and auditory steady-state responses (ASSR) in adult.

Aims:
To compare the thresholds of auditory brainstem response (Tb-ABR) and auditory steady-state responses (ASSR) in adult.


Methods:
This was a Case Control study, which was conducted in a clinical skill laboratory of faculty of medicine of Aleppo university From March 2011 to February 2012, 78 subjects )156 ears) (51 control group, 27 patients group with sensorineural hearingloss) were included in this study. Three commonly used frequencies (500, 1000, 2000 Hz) were evaluated. All subjects received ASSR, and Tb-ABR tests for threshold measurement (calibrated in dBHL). The correlation of ASSR thresholds with and Tb-ABR thresholds were assessed.


Results:
Mean Tb-ABR thresholds were significantly higher than ASSR; 34.23 vs 26.35 dB HL at 500 Hz (P<0.0001), 35.96 vs 25.77 dB HL at 1000 Hz (P<0.0001), 37.31 vs 28.85 dB HL at 2000 Hz (P<0.0001). Mean difference between the Tb-ABR and ASSR thresholds were 7.88, 10.19 and 8.46 dB, respectively, This difference was almost less 10 dB in different frequencies between control and patients group. There were positive correlation (r) between ASSR and Tb-ABR thresholds; 0.856, 0.895, and 0.850 respectively.


Conclusion:
The Tb-ABR thresholds were significantly higher than ASSR, When the degree of hearing loss increased the mean difference between the Tb-ABR and ASSR thresholds decreased, The mean difference in control group was always higher than patients group.


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Source :

Hatem Dalati, MD
Department of Otolaryngology, Head and Neck Surgery
faculty of Medicine, Aleppo University Hospital, Aleppo, Syria






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