An Analysis of Auditory Brainstem Responses at High Stimulate Rate in Patients with OSAHS / 听力学及言语疾病杂志

ABSTRACT

Objective To investigate the characteristics of auditory nerves and brainstem pathways,patho-physiological and nerve damages and the correlation between oxygen indexes,and the values of high stimulation ABR in patients with OSAHS.Methods Auditory brain stem responses (ABR)at rates of 11.1 times/s,31.1 times/s,51.1 times/s were performed in both the moderate-to-severe OSAHS group(5 cases of moderate and 34 cases of severe,in total of 39 cases ,78 ears)and the control group (34 cases,68 ears).According to the character-istics of ABR,the correlation with parameters of blood oxygen was studied.Results At the rate of 11.1 times/s, wave V latencies (5.79±0.22 ms)in OSAHS patients were longer than that in the control group.At the rate of 31.1 times/s,wave V latencies (5.98±0.19 ms)and waveⅠ(1.85±0.18 ms)in OSAHS patients were prolonged more than those in the control group.At the rate of 51.1 times/s,wave V latencies (6.09±0.25 ms)and waveⅠ(1.94±0.26 ms)in OSAHS patients were longer than those in the control group.Increasing stimulation rates from 11.1 times/s to 31.1 times/s showedΔⅠwas longer in OSAHS group(0.12±0.17 ms)than in the control group (0.07±0.11 ms).Increasing stimulation rates from 11.1 times/s to 51.1 times/s showedΔⅠwas longer in OS-AHS group(0.21±0.25 ms)than in the control group(0.15±0.10 ms).All above had correlations with hypoxia. Conclusion High stimulation rates in ABR by amplifying the waveⅠ latency confirm cochlear and auditory nerve damages near the cochlear segment in patients with moderate to severe OSAHS.Therefore the study of nerve injury in OSAHS patients should take blood oxygen saturation and hypoxia percentage rather than AHI.