Maico MI 34 Operating Instructions Manual page 39

Operating Instructions MI 34 / MI 34 H
severe negative middle ear pressure. The ear canal volume is normal and
the reflex is either absent or at an elevated level.
Eustachian tube disfunction 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 and the reflex may be
present, depending on the degree of involvement.
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