Preoperative determination of attic block. Examined by impedance audiometry.:-Examined by Impedance Audiometry-

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The usefulness of impedance audiometry in determining the presence of attic block was evaluated in 49 patients with chronic otitis media. At operation obstruction between the mastoid antrum and the mesotympanum was found in 22 ears, and no obstruction in 27 ears. The average impedance volume was 3.71ml in the ears without attic block, and 1.36ml in the ears with attic block. The significant differences were observed in impedance volume between the two groups (p<0.01). An impedance volume less than 1.4ml was considered to indicate attic block, while in ears without block the impedance volume was more than 2.0ml. A good correlation was found between the impedance volume and the size of the air-filled ear space in the group without attic block.
耳鼻咽喉科臨床学会の論文