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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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Welch Allyn MicroTymp 3 Handle Istruzioni per gli Interventi Pagina 41