THE EVALUATION OF THE HEARING AFTER TYMPANOPLASTY

The authors examined the hearing of the patients before and after tympanoplasty by the pure tone and speech audiometry.As the standard of the evaluation of the bearing, Social Adequacy Index (S.A.I.)was adopte3 in the speech audiogram, and Average Hearing Loss (A.H.L.)in the pure tone audiogram. The following data were given. S.A.I.A.H.L. hearing improvement +15or more +11db or more hearing no change from+14 to-14 from +10db to -10 db hearing worse -15 or more -11db or more According to these data the hearing of 100 cases, operated in the Departmen of O- torhinolaryngology of Nagasaki University Medical School, was evaluated as follows: hearing improved 25 cases hearing no change 61 cases hearing worse 14 cases They studied also the relationship of the improvement of the hearing after the o- pperations to the grade of the preoperative hearing loss. A.H.L.before the op.the hearing after the op. from 0 db to 29 db worse from 30 db to 39 db no change 40 db or more (mostly)improvement The indication of tympanoplasty for chronic otitis media should be judged on the basis of this results.