![]() ![]() Tympanograms may be grouped into 1 of 3 categories ( Fig. An ear filled with middle-ear fluid generally has a very noncompliant TM and therefore a flattened tympanogram tracing. In simple terms, anything tending to stiffen the TM, such as TM scarring or middle-ear fluid, reduces the TM compliance, which is recorded as a flattening of the curve of the tympanogram. The stiffness of the membrane is least, and accordingly its compliance is greatest, when the air pressures impinging on each of its surfaces-middle-ear air pressure and external canal air pressure-are equal. The absorption of sound by the TM varies inversely with its stiffness. The tympanogram provides information about TM compliance in electroacoustic terms that can be thought of as approximately equivalent to TM mobility as perceived visually during pneumatic otoscopy. ![]() Tympanometry, or acoustic immittance testing, is a simple, rapid, atraumatic test that, when performed correctly, offers objective evidence of the presence or absence of MEE. Kliegman MD, in Nelson Textbook of Pediatrics, 2020 Tympanometry ![]()
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