If the middle ear pressure is more negative than –400 dePa, the tympanogram tracing may appear flat, even without a middle ear effusion. Type “B” tympanogram pattern is not diagnostic of ...

This is a flat tympanogram with no peak. It suggests that there is little to no movement of the eardrum and middle ear system in response to changes in air pressure.

Kjell K. Helenius, MD, of the department of pediatrics at Turku University Hospital in Finland, and colleagues examined 514 children aged 6 to 35 months and compared tympanograms with pneumatic ...