OBJECTIVETo assess the value of multi-slice spiral CT (MSCT) and impedance audiometry in preoperative evaluation of eustachian tube function in patients with otitis media.

METHODSMSCT and impedance audiometry were performed in 61 patients with otitis media (63 ears), and the results were graded to analyze the correlation between the two examinations. The pathological changes at the tympanic orifice were recorded during surgical exploration of the eustachian tube, and the results were compared with those by MSCT and impedance audiometry.

RESULTSMSCT revealed normal findings in 8 ears, mild pathological changes in 19 ears, and severe changes in 36 ears. Soft tissue shadows at the tympanic orifice was found in 16 ears, and 47 ears were free of the shadows. Impedance audiometry showed normal findings in 20 ears, mild pathological changes in 15 ears, and severe changes in 28 ears. In surgical exploration, tympanic orifice lesions were detected in 22 ears, and were not detected in 41 ears. The rank correlation coefficient between MSCT and impedance audiometry was 0.706, suggesting a correlation between the two examinations. Goodness-of-fit test showed good match of the results of MSCT and surgical exploration (P=0.000, kappa=0.627).

CONCLUSIONMSCT combined with impedance audiometry provides a means for comprehensive evaluation of eustachian tube function and lesions, which greatly facilitates surgical planning and treatment of the lesions.