Operating Instructions
18
An extremely flaccid tympanic membrane or an ossicular chain discontinuity will yield a very high peak
compliance in the presence of normal middle ear pressure and ear canal volume will be normal.
A fixation of the ossicular chain, as in otosclerosis, will produce a tympanogram with very low
compliance in the presence of normal middle ear air pressure while ear canal volume is normal.
Middle ear fluid such as in serious otitis media will yield a very flat tympanogram with no definite peak
and negative air pressure. A resolving case or beginning case may produce a reduced peak in the
presence of severe negative middle ear pressure. The ear canal volume is normal and the reflex is either
absent or at an elevated level.
Eustachian tube dysfunction in the absence of fluid will show a normal compliance curve, but it will be
displayed to the negative side of the tympanogram. Ear canal volume will be normal.
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