Type B Tympanogram
A flat tympanogram trace showing no identifiable peak, indicative of absent or severely reduced middle ear mobility, most commonly associated with middle ear effusion.
Full Definition
In the Jerger classification system, a Type B tympanogram is characterised by a flat or rounded curve with no discernible peak across the tested pressure range. This pattern typically indicates that the tympanic membrane is not moving freely, most often due to the presence of fluid in the middle ear (otitis media with effusion) or a perforated tympanic membrane with a large ear canal volume. The distinction between these two causes requires consideration of the equivalent ear canal volume: a large volume with a flat trace suggests perforation, while a normal volume suggests effusion. Editors must ensure the Jerger type designation is capitalised and accompanied by the ear canal volume data for the finding to be clinically interpretable.
Usage
Usage note: Always capitalise the Jerger type designation (Type A, Type B, Type C). Include equivalent ear canal volume to support interpretation.
In Context
- "A Type B tympanogram was obtained in the right ear, consistent with middle ear effusion confirmed on otoscopy." — Paediatric audiology report
- "Authors should capitalise 'Type B' and include the equivalent ear canal volume when reporting a flat tympanogram trace." — Editorial checklist for audiological reports