Application of Intraoperative EABR in the Young Deaf With Cochlear Implants / 听力学及言语疾病杂志

ABSTRACT

Objective The aim of the study was to investigate the intraoperative EABR as a reference of beginning of fitting the cochlear implant(CI)and predicting the result.Methods Intraoperative EABR were recorded in two young children(two years,and three and half years)receiving the Digisonic DX 10 Cochlear Implant.Electrodes 15,13,10,7 and 4 were investigated using Digistim Stimulation Mode.Results During the surgery,wave Ⅲ and Ⅴ were clearly seen in the EABR.It was to demonstrate that the function of the auditory pathway of cochlear nerve and brainstem would be good.Measuring behavioral thresholds after implanted chochlea in patient was similar to predict the result.In young child the EABR thresholds were 15 ?s?60 ?V,20 ?s?60 ?V,25 ?s?60 ?V,30 ?s?60 ?V and 30 ?s?60 ?V at electrodes 15,13,10,7 and 4,whereas in another child the EABR thresholds had 15 ?s?50 ?V,20 ?s?50 ?V,25 ?s?50 ?V,20 ?s?50 ?V,and 20 ?s?50 ?V.Based upon the EABR thresholds,the amplitude for beginning of fitting was set at the 15～20 ?V differences between the Digisonic PDX10 and the EAB stimulation.Minima threshold level was set at 15 dB for starting of the number of electrode 15, and then the number of electrodes were decreased with increasing minima threshold levels(2～3 step).This was also achieved by increasing the maximum electrical thresholds.Conclusion It is confirmed that the intraoperative EABR could predict the result,and could be more precise and sensitive for beginning of fitting the cochlear implant as a reference.