Prognostic and influencing factors of tinnitus in chronic otitis media after tympanoplasty

The purpose of this study is to investigate what characteristics of tinnitus in patients with chronic otitis media was reduced after tympanoplasty and to assess the relationship between post-operative tinnitus reduction and pre-operative tinnitus tone, tinnitus duration, post-operative hearing recovery, and tympanogram. Medical records were prospective between March 2013 and May 2016. Audiologic evaluation by pure tone audiometry and acoustic impedance and tinnitus assessment using scores on the Tinnitus Handicap Inventory (THI) was conducted preoperatively and 6 months post-operatively. The data were analyzed using the Wilcoxon test, Student’s and paired t test, and ANOVA. The pre-operative incidence of tinnitus in patients with COM was 47%. There was a very significant difference between pre-operative and post-operative mean THI scores (p < 0.05). Tinnitus was reduced or alleviated in 83% of tinnitus patients. Pre-operative low-tone tinnitus was significantly reduced 6 months after surgery. After surgery, air-conducted hearing improvement at 250, 500, and 1000 Hz in the tinnitus significant recovery group was greater than the tinnitus non-significant recovery group (p < 0.05). Tinnitus reduction in tympanogram A was significantly greater than in tympanograms B or C (p < 0.05). There was no statistically significant correlation between tinnitus duration and tinnitus reduction (p > 0.05). There was no significant effect of presence cholesteatoma and dry period on the gain THI (p > 0.05). The types of tympanoplasty had no effect on tinnitus improvement (p > 0.05). No patients experienced new tinnitus after surgery. Following tympanoplasty, most patients experienced a reduction in tinnitus. Pre-operative low-tone tinnitus is easier to reduce after tympanoplasty. Post-operative normal tympanogram and improved low-frequency AC hearing were important to tinnitus reduction.