Effectiveness of Intratympanic Dexamethasone Injection for Tinnitus Treatment: A Systematic Review and Meta-Analysis

Objectives. Intratympanic dexamethasone injection (ITDI) has been introduced as a treatment option for subjective tinni-tus. However, the effects of ITDI on patients with tinnitus remain unclear. In the present systematic review and meta-analysis, we evaluated the effectiveness of ITDI for tinnitus treatment. Methods. We searched Medline, the Cochrane Central Register of Controlled Trials, and Embase. Four double-blind ran-domized controlled trials that tested the efficacy of ITDI compared with a placebo were deemed eligible for a quantitative meta-analysis, while four prospective studies and seven retrospective studies reporting the effectiveness of ITDI on tinnitus treatment were included in a qualitative synthesis. Results. In the four studies included in the quantitative meta-analysis, ITDI did not show evidence of tinnitus improvement compared with placebo (odds ratio [OR], 1.38; 95% confidence interval, 0.53–3.61). In the 11 studies included in the qualitative synthesis, seven retrospective studies without controls reported rates of tinnitus improvement after ITDI ranging from 35.9% to 91.3%. In the four prospective studies with controls, ITDI seemed to be effective when combined with other drugs for tinnitus treatment. Conclusion. ITDI alone did not show a significant effect for treating tinnitus compared with placebo. However, the poten-tial of combination treatment of ITDI with other drugs for tinnitus therapy should be further studied in more systematic research.