고실성형술 전ㆍ후 순음청각검사 결과와 주관적 청각이득의 관계

Abstract

Background and Objectives：Measuring the therapeutic effect of tympanoplasty is usually dependent on the surgeons view-point and the results of pre- and post-operative pure tone audiometry (PTA). But there is considerable discrepancy between the subjective hearing benefit and the PTA, so the aim of this study is to evaluate the correlation between them among the patients who had tympanoplasty for chronic suppurative otitis media. Subjects and Method：One hundred patients who had tympano-plasty betwen 20 and 201 were studied. Patients were divided into two groups, improved and not-improved group, acording tive hearing benefit. The pre and postoperative air conduction threshold (AC), bone conduction threshold (BC), air-bone gap (ABG) and the amount of increment or decrement of these parameters were compared between the two groups. Results：Analysis of the data showed significant differences betwen the two groups with respect to preoperative ABG , postoperative AC, postoperative ABG , AC decrement and ABG decrement. Especialy, when hearing group was increased very strongly. Conclusion：Among the pre- and post-tympanoplasty PTA results, the most useful indicators of patients subjective hearing benefit are the amount of AC decrement (more than 10 dB) and ABG decrement (more than 20 dB). (Korean J Otolaryngol 2007 ;50 :399-403)