Eustachian tube function in tympanoplasty.

Prognostic value of preoperative Eustachian tube function was examined in 77 ears subjected to type 1 tympanoplasty. Eustachian tube function was evaluated by positive and negative pressure equalization tests, and clearance test. Based on the results of these three tests, the ears were classified into four grades. The outcome of the ear surgery was judged by postoperative hearing, presence of otorrhea, atelectasis and perforation of the eardrum. Results of the positive pressure equalization and clearance tests of the tube were correlated with the outcome of ear surgery, although the negative pressure equalization test had no correlation with it. The percentage of unsuccessful outcomes increased with the grade of tubal dysfunction, indicating that tubal function is closely associated with the outcome of ear surgery. Thus, it was revealed that the preoperative tubal function test including positive pressure test and clearance test are useful for predicting the prognosis of ear surgery.