RESUMO
OBJECTIVE: To analyze audiometric data after surgical manipulation of the membranous labyrinth during plugging of superior semicircular canal dehiscence (SSCD) or posterior semicircular canal occlusion (PSCO) for benign paroxysmal positional vertigo. STUDY DESIGN: Retrospective chart review. SETTING: Tertiary referral center. PATIENTS: Patients undergoing plugging of SSCD or PSCO between 2009 and 2019. MAIN OUTCOME MEASURES: Pre- and postoperative audiometric data were collected per AAO-HNS guidelines. Hearing outcomes at initial and last follow-up were compared. Subanalyses were performed for surgical approach and age. RESULTS: Eighty-seven total procedures in 76 patients including 43 middle cranial fossa for SSCD, 29 transmastoid SSCD, and 15 PSCO. Mean preoperative air-conduction-pure-tone averages was 21.1±14.9âdB compared with 26.1â±â19.6âdB at initial follow-up and 24.4â±â18.6âdB at last follow-up (pâ=â0.006). Mean preoperative bone-conduction-pure-tone average was 14.3â±â11.9âdB compared with 18.3â±â15.6âdB at initial follow-up and 18.5â±â16.9âdB at last follow-up (pâ<â0.001). There were five cases of hearing loss >20âdB including one case of profound sensorineural hearing loss >55âdB. PSCO resulted in the most hearing loss at initial follow-up but largely resolves with time. Transmastoid approaches for SSCD resulted in more hearing loss compared with middle cranial fossa. Hearing outcomes were generally stable for SSCD approaches but showed improvement over time for PSCO. Age >50 was associated with greater hearing loss of 5.2â±â11.1âdB compared with 1.3â±â10.5âdB but did not reach statistical significance (pâ=â0.110). CONCLUSIONS: Surgical manipulation of the membranous labyrinth results in statistically significant hearing loss in a pooled analysis. Transient hearing loss is observed in PSCO and TM SSCD plugging was associated with postoperative hearing loss. There was a trend toward increased hearing loss in patients >50âyears old.