(A427) The Effect of Cosmetic Surgery on Eustachian Tube Function

Introduction: Enrolled were 268 patients (60 males and 208 females; mean age, 24.3 years old) who were diagnosed with jaw anamorphosis symptom and underwent ort hognathic surgery of the lower jaw, and who were tested for auditory tube func tion before and after the surgery at our hospitals the period between Dec. 2012 and Feb. 2023.

Methods: As regards auditory tube function tests, the impedance test, or tymp anometry, (hereinafter refer to as TM), was Sonotubometry (SON) and tubo-tympa no-aerodynamic graphy (TTAG) were conducted using Auditory Tube Function Test Apparatus ET-500 (manufactured by Nagashima Co.). The tests were conducted as a rule the day before and after operation. Patients whose auditory tube ondu cted using Impedance Audiometer RS-21 (manufactured by RION Co.). dysfunction was found to be aggravated were observed with daily TM testing until the funct ion recovered to the pre-operative level.

Results: The incidence of post-operative auditory tube dysfunction 　Post-o perative auditory tube Dysfunction was noted　subjectively in 49patients(18.3%) and determined by TM in 162(60.4%).
Lowered auditory tube function was found by TM at a high rate following orthognathic surgery for lower jaw. Approximately 30% of patients with TM aggravation complained ear symptoms.

Conclusions: Pre-and post-operative auditory tube functions were investigated u sing TM, SON and TTAG in patients (n=268) who underwent cosmetic surgery for lower jaw.
Post-operative auditory tube dysfunction recovered spontaneously an average of 3.48 days without providing ventilation treatment while patients were placed under observation.
Patients with post-operative auditory tube dysfunction that lasted longer tha n 4 days or with complaints of subjective symptoms were given ventilation trea tment. All cases were cured within 14 days.