1282. Sealing of Superior Semicircular Canal Dehiscence is Associated with Improved Balance Outcomes Post-Operatively Compared to Plugging

Authors: Vivian Lian Wung; Prasanth Romiyo, BS; Edwin Ng; Courtney Duong, BS; Thien Nguyen, BS; David Seo, BS; Isaac Yang, MD; Quinton Gopen, MD (Los Angeles, CA)

Introduction: Superior semicircular canal dehiscence (SSCD) is a condition in which the bony ceiling of the superior semicircular canal thins to create a fistula between the canal and the cranial cavity. SSCD has been effectively repaired using plugging which occludes the canal, and resurfacing or capping which aim to preserve patency of the canal. Because SSCD is rare, evidence is inconclusive as to whether occlusion or preservation of the canal results in better outcomes. In this study, we introduce a fourth method of repair termed “sealing,” and compare its outcomes to plugging. Methods: This study is a retrospective chart review of 136 surgical cases. Postoperative MRIs were assessed for preservation or loss of semicircular canal fluid signal to identify cases of plugging and sealing. We then used a binomial logistic regression to determine association of plugging or sealing with postoperative symptoms. Results: Patients with preservation of fluid signal were less likely to have dizziness postoperatively, with an odds ratio of .158 (p=0.007, OR=.158 , 95% CI: .041-.611). These these patients were more likely to have tinnitus postoperatively, with an odds ratio of 3.5 (p=.028, OR = 3.515, 95% CI: 1.145-10.787). Other relationships were not statistically significant. Conclusion: Superior semicircular dehiscence patients that undergo sealing without plugging have improved balance outcomes but show more tinnitus postoperatively compared to patients that undergo plugging.