Abstract:
Objective:
Investigate the impact of obstructive sleep apnea (OSA) on complex auditory brainstem response (C-ABR).Also, the evaluation C-ABR affection degree corresponded with the severity of OSAS.

Methodology:
C-ABR has been employed in a prospective study on 30 individuals with obstructive sleep apnea. Results were compared to those of normal people.
Results: All participants had the seven C-ABR waves. In the waves of the filter element (transients) wave V (onset), wave C (transition), offset peak O, there was a significant statistical difference between the control and study, indicating that OSAS patients had abnormal neural synchrony affecting the filter element. However, there was no statistically significant difference in C-ABR latencies in the waves on the source elements (D, E, F).
Conclusion:
OSAS patients had aberrant neuronal synchronization that affected the filter elements (transients) and waves (V, C, O), but not the source elements.

Key words
Obstructive sleep apnea (OSA), Click evoked auditory brain stem response (click-ABR), Complex –auditory brain stem response (C-ABR), Apnea hypopnea index (AHI),Polysomnography.