Abstract
We evaluated sonotubometrical test of eustachian tube function on 41 ears with improved prognoses after middle ear surgery. In 58.5% of ears at the first examination, the active opening of the eustachian tube was positive. However, this result was worse than expected, so we reexamined the negative cases that might include false negative findings, because they showed better clinical and morphological findings. As a result, 6 of 17 negative ears were positive, and so active opening of the eustachian tube was shown in 73.2% of 41 ears. It suggested that we need consider false negative findings when judging eustachian tube function by sonotubometry after middle ear surgery.
