Evaluation of noninvasive eustachian tube function tests in normal adults

Area of Science:

• Otolaryngology
• Physiology
• Medical Diagnostics

Background:

• Eustachian tube (ET) dysfunction is causally linked to otitis media (OM).
• Establishing normative data for ET function (ETF) is crucial for diagnosing ET dysfunction.
• Noninvasive methods are preferred for assessing ETF in otologically normal populations.

Purpose of the Study:

• To present normative data for ETF in an otologically normal college-age population.
• To compare the agreement and repeatability of two noninvasive ETF assessment methods: nine-step tympanometry and sonotubometry.
• To determine the combined diagnostic utility of these methods for identifying normal ETF.

Main Methods:

• Recruited 107 otologically normal college-age subjects.
• Utilized nine-step tympanometric testing and sonotubometry to assess ETF.
• Evaluated test agreement, repeatability across three sessions, and combined test performance.

Main Results:

• A 78% agreement was observed between nine-step tympanometry and sonotubometry in single test sessions.
• Repeatability rates were 52% for nine-step testing and 34% for sonotubometry over three sessions.
• The combination of both tests identified 96% of subjects as having some degree of normal tubal function.
• Sonotubometry was considered more physiologic, despite similar information on tubal opening.
• Normal population data: average nine-step category 2, mean dilation 0.40s, mean middle-ear pressure -12 mm H2O.

Conclusions:

• Both nine-step tympanometry and sonotubometry can assess ETF, with sonotubometry offering a more physiologic measure.
• The combination of these noninvasive tests is highly effective in identifying normal eustachian tube function.
• Normative data were established for college-age individuals, aiding in the diagnosis of ET dysfunction and related conditions like otitis media.