[Clinical observation of attic retraction pocket by otoendoscopes].

Objective:To explore the clinical effect, key points and techniques of otoendoscopic surgery in patients with attic retraction pocket. Method:Data of 25 patients (25 ears) of chronic suppurative otitis media who treated with transcanal endoscopic ear surgery for attic retraction pocket were retrospectively analyzed. Patients were examined by otoendoscopes at postoperative 1, 3 and 6 month，respectively. Patients were tested by pure tone audiometry，tympanometry test and high resolution CT of temporal bone at postoperative 6 month. Result:The healing rate of perforation was 100% in 25 patients (25 ears) at postoperative 1 month. There was no infection, tinnitus, vertigo, decrease of air-bone conduction hearing and other complications. All patients had good tympanic membrane shape, no perforation, no invagination or adhesion in tympanic membrane at postoperative 6 month.The mean preoperative air conduction threshold was (39.59±8.37)dB HL, while it was (26.21±7.51)dB HL at postoperative 6 month (t=8.265，P<0.01).The mean preoperative air-bone gap was (28.67±6.58)dB HL, while it was (13.63±7.33)dB HL at postoperative 6 month (t=11.862，P<0.01).The mean air conduction threshold and the mean preoperative air-bone gap were significantly improved compared with those preoperative (P<0.01). Tympanometry test was "A" type at postoperative 6 month. Conclusion:The treatment of attic retraction pocket by otoendoscopes through external auditory canal has the advantages of clear image, wide field of vision, simple operation, less trauma, short operation time, accurate effect, and can reduce the residual and recurrence of lesions.