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Comparison of pure tones and noise stimuli in sonotubometry
T Palva1, T Marttila, T Jauhiainen
1Department of Otolaryngology, Helsinki University Hospital, Helsinki, Finland.
Abstract:
Sonometric data on the Eustachian tube opening response to swallowing and to pressing the mandible down were evaluated in 51 normal ears and 62 ears with chronic disease. Testing with a narrow-band noise which was centered on 7 and 8 kHz gave the best results. The limit for a positive response was set at 3 dB, and of the normal ears, 80% showed a positive response in a short routine test. The data correlated reasonably well with surgical results. If test results point to tubal insufficiency, measures should be taken to prevent the formation of retraction pockets.
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