title: [Evaluation of bone conduction after chronic ear surgery and after stapedectomy].
abstract: The bone conduction threshold changes of 295 ears which underwent chronic ear surgery (177 ears) or stapedectomy (118 ears) were determined by comparing last preoperative with 4 to 6 weeks postoperative audiogram. Three types of middle ear operations were evaluated: radical mastoidectomy, modified radical mastoidectomy and intact wall mastoidectomy with tympanoplasty (first stage). A total stapedectomy was performed with adipose seal and tarflen prosthesis. The preoperative mean bone conduction thresholds of radical mastoidectomy at 2000-4000 Hz frequency range was significantly worse when compared to radical modified mastoidectomy and to mastoidectomy with tympanoplasty (first stage). A significant deterioration of mean bone conduction thresholds at 500 Hz, 1000 Hz, 2000 Hz and 4000 Hz was observed after open techniques and at 2000 Hz and 4000 Hz after intact wall mastoidectomy with tympanoplasty (first stage). After stapedectomy a positive change (improvement of mean bone conduction) was noted at 1000 Hz and 2000 Hz. It seems that observed changes in the bone conduction thresholds may be due to damaging risk of surgical procedure (chronic ear surgery and stapedectomy) and influence of ossicular chain mobilisation on bone conduction transmission (stapedectomy).
authors.affiliation: Kliniki Otolaryngologii Akademii Medycznej w Lodzi.
authors.forename: M
authors.initials: M
authors.lastname: Lukowski
authors.forename: L
authors.initials: L
authors.lastname: Białaczewski
mesh_terms: D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D000368:Aged; D001299:Audiometry; D001309:Auditory Threshold; D001844:Bone Conduction; D002908:Chronic Disease; D004432:Ear, Middle / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008416:Mastoid / Q000601:surgery; D008875:Middle Aged; D010033:Otitis Media / Q000503:physiopathology / Q000601:surgery*; D013201:Stapes Surgery; D014433:Tympanoplasty
vernacular_title: Ocena przewodnictwa kostnego po leczeniu operacyjnym przewlekłego zapalenia ucha środkowego oraz po stapedektomii.