Compare Signatures

Place any two tympanometric signatures side by side, or overlay them on one set of axes.

-400-300-200-10001002000.00.51.01.52.02.53.0Ear-canal pressure (daPa)Admittance (mmho)

■ Normal middle ear ■ Otitis media with effusion

Normal middle ear

A single, well-defined peak near 0 daPa with static admittance and width inside adult normative limits.

Type AReflex: present

Otitis media with effusion

A flat (type B) trace with a normal equivalent ear-canal volume — the hallmark of fluid loading the middle-ear system.

Type BReflex: absent