[Influence of chronic sinusitis on middle ear function].
OBJECTIVE: To study the effect of range size and duration of chronic sinusitis on middle ear function. METHOD: Eustachian tube function, tympanogram and air hearing threshold were measured with an acoustic impedance audiometer and pure tone audiometer in 56 patients (112 ears). RESULT: Eustachian tube function was disturbed in 48.3% cases, tympanogram was abnormal in 42.0% cases, and air hearing threshold was increased in 33.9% cases. Comparison of middle ear function between anterior sinusitis and pan-sinusitis showed significant difference (P < 0.01), middle ear function between the course of less 5 years and of more than 5 years had significant difference (P < 0.05). CONCLUSION: The damage of middle ear function become more serious with the extent of lesion and with the longer course of disease in paranasal sinuses.