title: Evaluation of improvement of hearing in type I tympanoplasty & its influencing factors.
abstract: study included 40 patients treated for CSOM with central perforation. Only type I tympanoplasty was done in 30 patients with dry central perforation and simple mastoidectomy with type I tympanoplasty was performed in 10 patients with moist or discharging perforation. Type I tympanoplasty utilizing an underlay technique with TFG shows high probability of success (85%). Presence of bilateral perforations lowers the success rate (66.66%). Status of non-operated ear is a significant factor for success rate. An overall hearing gain of about 10db was achieved. Poor pre-operative hearing status of elderly adversely influences post-operative improvement of hearing. Typel tympanoplasty with simple mastoidectomy results excellent surgical success rate (100%) but gives less improvement of hearing (closure of A-B gap= 3.3db). In type I tympanoplasty alone surgical success rate drops to 80-75% but is offers more improvement of hearing (closure of A-B gap = 6.708 db).
authors.affiliation: Department of Otorhinolaryngology, North Bengal Medical College, West Bengal.
authors.forename: Asok K
authors.initials: AK
authors.lastname: Saha
authors.forename: D M
authors.initials: DM
authors.lastname: Munsi
authors.forename: S N
authors.initials: SN
authors.lastname: Ghosh
keywords: CSOM; Hearing gain; influencing factors; type I tympanoplasty