The present results indicated that the type AD of tympanogram and respiring waves which appeared in tympanogram might not be sensitive indications of diagnosing Eustachian tube closing failure.

• 指出AD型的鼓室导抗图和鼓室导抗图上出现的呼吸波是否为诊断咽鼓管异常开放的灵敏指标值得探讨。