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  • Title: Middle-ear pressure and eustachian tube function.
    Author: Virtanen H, Marttila T.
    Journal: Arch Otolaryngol; 1982 Dec; 108(12):766-8. PubMed ID: 7150069.
    Abstract:
    In 92 healthy persons with the common cold, 184 ears were examined and 786 coincidental sonotubometric and tympanometric measurements were taken. There was a good tubal function when the middle-ear pressure was 0 to -25 mm H2O, with 91% of the tubes opening during swallowing. A systematically reduced tubal opening was noted as the middle ear pressure decreased from 0 to -200 mm H2O. The present study discloses that a negative middle-ear pressure evaluated by tympanometry does not always denote a closed tube, nor does a flat tympanogram necessarily indicate a middle-ear effusion. No definite limits could be ascertained for the normal middle-ear pressure; the middle ear is extremely dynamic, and middle-ear pressure can change for many reasons.
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