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DIAGNOSIS OF AUDITORY DISORDERS
DISORDERS AND THEIR SYMPTOMS
82
Chap. 9
9.1
available in Tymp. Advanced Mode (not Version 2.x of the ZODIAC
901).
9.1.6 FLABBY TYMPANIC MEMBRANE
A flabby (flaccid) tympanic membrane may be due to aging, healed per-
forations, or surgery. It will result in a static compliance which is greater
than normal. Reflexes are usually absent.
9.1.7 IMPACTED CERUMEN (DRIED EAR WAX)
Excessive production of earwax will reduce the Ear Canal Volume, and
may completely obstruct the ear canal. In this case the tympanogram
will exhibit an absence of a peak.
9.1.8 PATULOUS EUSTACHIAN TUBE
A patulous (spread) Eustachian Tube will not close, with the result that
the patient's breathing interferes with hearing. The static compliance
will be normal but the tympanogram will be broadened (abnormally
large tympanogram width) and may exhibit irregularities because of in-
terference from the patient's breathing. If the eardrum is not perforated,
this condition may be investigated using the Intact Eardrum test avail-
able in Tymp. Advanced Mode (not Version 2.x of the ZODIAC 901).
9.1.9 COCHLEAR HEARING LOSS
Cochlear and retrocochlear hearing loss will be characterized by in-
creased reflex thresholds and increased air conduction thresholds. The
tympanogram should not be affected.
GN Otometrics
ZODIAC 901 Middle-Ear Analyzer
Operation Manual
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