Audio Traveler AA222, Operation Manuals, Page: 21 / 141

AA222 Operation Manual Page 21
Examples of Interpretation
In the following, some typical compliance curves, reflex curves and the
possibly associated pathology are shown. The curves are idealised
and only one expected pathology is described for each combination of
tympanogram and reflex.
A combination of variables always has to be taken into consideration.
E.g. the combination of a stiff middle ear system and a floppy eardrum
may result in a tympanogram falling within the normal category. The
interpretations stated here are generalised examples taken from the
currently available literature and they can, of course, vary with each
individual case.
The diagnostic value of tympanograms showing a "D" or "E" shape is
reduced today. A probe tone higher than 226 Hz has been preferred
for these particular tympanograms.
Pathology : Normal ear.
Volume : Normal.
Pressure : -100 daPa to +100 daPa.
Ventilation : Present.
Reflex
: Present.
Audiogram : No hearing loss.
Pathology : Cochlea lesion.
Volume
: Normal.
Pressure : -100 daPa to +100 daPa.
Ventilation : Present.
Reflex
: Present or absent.
Audiogram : Sensory neural hearing loss.