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“Round window reinforcement versus transmastoid superior canal occlusion in the treatment of superior semicircular canal dehiscence syndrome”

Horace Cheng, Kevin Krysiak, Sumit Agrawal, Lorne Parnes


Objective: Outcome study of round window reinforcement (RWR) and canal occlusion (CO) in the treatment of superior canal dehiscence (SSCD) syndrome.

Methods: A prospective case series of patients with diagnosis of SSCD undergoing primary surgery between 2010–2016. Twenty-three RWR and sixteen CO procedures were included.  Patient symptoms were studied using a published nine-item questionnaire.  Pre-operative and post-operative audiometric results were analyzed.

Results: Both groups achieved statistically significant (p<0.001) improvement in symptom scores: 40% for RWR and 56.5% for CO.  Improvement in symptom score was more pronounced in CO compared to RWR though the difference did not reach statistical significance (p=0.012) with Holm-Bonferroni correction. Audiometric data showed no difference in hearing outcomes using the two surgical interventions.

Conclusion: RWR and CO are both effective and safe surgical options.  The former is less invasive while the latter seems more effective. This work provides valuable outcome data for informed consent discussions.

Learning Objectives

  1. Understand the round window reinforcement and transmastoid canal occlusion approaches in the management of superior semicircular canal dehiscence syndrome (SSCD).
  2. Appraise the efficacy and safety profiles of the two procedures.
  3. Become familiarized with a nine-item questionnaire for evaluation of SSCD symptom severity.

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Scheduling Details

This 7 minute presentation is scheduled to take place on June 4, 2019 at 14:39 in the Salon 8.

Authors' Contact Details

Corresponding Author: Dr. Horace Cheng

Senior Author: Dr. Lorne Parnes

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