Preliminary Application of Intra-Operative Hearing Monitoring by Tone Pip Abr Via Loudspeakers

Conclusion: This method might be an effective intra-operative way to access hearing threshold under general anesthesia in the operating room.Objective: To develop an intra-operative hearing monitoring method for surgeons to access hearing threshold under general anesthesia in the operating room.Method: System establishment and calibration was done firstly. Normal hearing (NH) and conductive hearing loss (CHL) participants were recruited. This study applied pure tone audiometry (PTA) to all subjects and tone pip ABR (tp-ABR) via loudspeakers in sound booth and operating room for NH and CHL subjects, respectively. For NH subjects, Bland Altman was conducted to compare 1k Hz PTA and tp-ABR threshold. For CHL participants, Paired t-test, Satterth waite t'-test, and linear correlation analysis were used to compare the two methods. p<.05 was considered statistically different.Results: (1) Bland Altman showed all plots were inside the 95% confidence interval, indicating that there was no difference between the two methods for NH subjects. (2) The two methods had a high correlation (Pearson's coefficient =0.872>0.6, p<.05) in assessing hearing threshold in the operating room. (3) Satterth waite t'-test showed the ossicular chain malfunction enlarged the deviation of threshold by the two methods (.01