Conditions Which Cause Negative Middle Ear Pressure
Figure 32
Negative pressure within the middle ear space will produce a tympanogram
with a negative tympanometric peak. Some degree of negative pressure is
normal (see normal TPP values listed in Table 1 on page 18). Negative middle
ear pressure often accompanies a cold or allergies, or can be a result of
eustachian tube dysfunction. Negative middle ear pressure is not usually
associated with effusion when peak Ya is normal.
Conditions Which Cause Positive Middle Ear Pressure
Figure 33
Positive pressure tympanograms reflect positive pressure in the middle ear
space. A positive Tympanometric Peak Pressure (TPP) can be indicative of
acute otitis media, but only if the tympanometric peak is extremely positive.
Appendix A
A-37
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