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Electrically evoked auditory brainstem responses in patients with absence of cochlear modiolus receiving cochlear implantation

WANG Zhenxiao;WANG Lin′e;GONG Shusheng;HAN Shuguang;GAO Fenqi;Department of Otolaryngology Head and Neck Surgery,Beijing Friendship Hospital,Capital Medical University;  
Objective:The purpose of this study was analyzing the characteristic of the electrically evoked auditory brainstem responses(EABR)of cochlear implantation(CI)patients with absence of cochlear modiolus(ACM)and comparing the EABR results in deaf patients with normal anatomic structures.Also we assessed the auditory rehabilitation of ACM patients after cochlear implantation.Method:Twenty-eight profoundly deaf patients were contained,14 of them were ACM(group A)and the rest were normal anatomic structures(group B).They all received Austria cochlear implants from 2004 to 2015.Postoperative EABR were measured and recorded with No.2,6,11 electrodes in patients receving cochlear implantation.The lead-out rate and threshold of EABR between groups were compared and analyzed.Result:The lead-out rates of EABR in group A was 71.4% and group B was100%.The thresholds of EABR in group A were higher than group B(P0.05).In group A,there were no statistical difference in the thresholds of EABR among electrodes No.2,6and 11.However,in group B,there were statistical difference in the thresholds of EABR between electrodes No.2 and 11(P0.05),and the thresholds of No.2was lower than No.11.Conclusions:EABR could be used in assessing the objective auditory rehabilitation in ACM patients after cochlear implantation.
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