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Purpose The purpose of this study is the evaluation of post-operative hearing threshold after revision surgery and obliteration of troublesome canal wall down mastoidectomy cavities (CWDMCs). The ability to use and tolerate conventional hearing aids (CHAs) was also evaluated. Methods A retrospective chart analysis of 249 patients with chronically draining CWDMCs who underwent revision surgery including obliteration of the mastoid cavity between 2007 and 2017 at the AMC location of the Amsterdam University Medical Centers (Amsterdam UMC) was performed. Patient characteristics, pre- and post-operative Merchant grade, surgical outcomes, pre- and post-operative hearing thresholds, and the ability/necessity to use a CHA or the ability/necessity to use a Bone Conduction Device (BCD) were recorded. Results Dry ears were found in 95% of the total cohort. Residual disease was detected in 1.6% during MRI follow-up with no residual cholesteatoma in the obliterated area. In 3.2% of the patients, recurrent disease was found. A significant improvement in mean air conduction level, mean bone conduction level, and mean air-bone gap (ABG) was found post-operatively (p p p Conclusion This study shows that revision surgery and obliteration of CWDMCs enable successful CHA rehabilitation post-operatively. Upon this type of surgery, hearing thresholds improve significantly, but the need for rehabilitation with a CHA remains necessary in most cases.

The main type of acquired hearing impairment is presbycusis (age-related hearing impairment). In presbycusis, mainly the high tones are no longer heard properly. In the Netherlands, approximately 2 million people are hard of hearing. About one third of all hearing impaired people have 1 or 2 hearing aids. 90% of the group of hearing aid users consists of people over 65. 15% of hearing aid users never or rarely use their hearing aid. The main complaint of hearing aid users is a reduced understanding of speech in noise. When the hearing impaired start to avoid a noisy setting, this can lead to symptoms of sadness and loneliness. Hearing aids live only partially up to promises. Both more information about hearing aids and more support for hearing aid users are necessary to achieve greater satisfaction.