Partial promontory technique in stapedotomy cases with narrow niche.

Abstract

The objective of this study was to examine clinical and audiometric outcomes of a laser partial promontory technique in stapedotomy cases with a narrow oval window niche. We conducted a retrospective chart review. This study was conducted at a tertiary referral center. We studied 59 patients who underwent a partial promontory technique with stapedotomy between 1994 and 2000. Seventy-two patients who underwent primary stapedotomy without promontory technique served as a control group. Preoperative and postoperative audiometric results were obtained for 59 patients undergoing laser stapedotomy with a narrow oval window niche. The partial promontory removal was performed with a KTP laser. Results were compared with 72 primary laser stapedotomy cases without the promontory technique within the same time period and analyzed using paired Student t test. Ninety percent of the partial promontory cases were successful (air-bone gap [ABG] <10 dB). The mean postoperative ABG was 5.1 dB, which was comparable to the non-promontory cases (p = 0.7). The mean change in postoperative bone conduction was also comparable (p = 0.98). There were no cases of sensorineural hearing loss. An overhanging facial nerve was present in 32% of the narrow niche cases and a dehiscent facial nerve was encountered in 17% of these cases. Partial laser removal of the promontory as an adjunct to laser stapedotomy cases with a narrow oval window niche is a safe, effective technique with comparable results to primary laser stapedotomy.