Tympanogram
Pronunciation: tim-PAN-oh-gram
The graphical record produced by tympanometry, plotting middle ear admittance against ear canal air pressure to indicate middle ear status.
Full Definition
A tympanogram is the visual output of a tympanometry test, displaying acoustic admittance (or compliance) on the vertical axis against applied ear canal air pressure (in daPa) on the horizontal axis. The shape and peak of the tympanogram are classified using the Jerger classification system (Types A, As, Ad, B, and C), with each type associated with specific middle ear conditions. Editors must not use 'tympanogram' and 'tympanometry' interchangeably: tympanometry is the test procedure; the tympanogram is the result. When reporting classification, the type designations (A, B, C, etc.) should be italicised or placed in quotation marks according to the house style, but must be applied consistently. Sub-type designations (As, Ad) require subscript formatting in print.
Usage
Usage note: Distinguish clearly from 'tympanometry' (the procedure). Subscript formatting is required for type sub-designations (As, Ad) in print publications.
In Context
- "A Type B tympanogram with reduced peak admittance was consistent with middle ear effusion." — Paediatric audiology report
- "'Tympanogram' refers to the graphical result; do not use it as a synonym for the test procedure 'tympanometry.'" — Clinical writing style note