Eustachian Tube Dysfunction
Pronunciation: yoo-STAY-shun toob dis-FUNK-shun
Also written as: ETD — Eustachian Tube Dysfunction
Impaired function of the Eustachian tube that disrupts pressure equalisation in the middle ear, contributing to conductive hearing loss and tympanometric abnormalities.
Full Definition
The Eustachian tube connects the middle ear to the nasopharynx and normally opens to equalise middle ear pressure with atmospheric pressure. Eustachian tube dysfunction (ETD) occurs when this tube fails to open appropriately (obstructive ETD) or remains abnormally patent (patulous ETD), resulting in pressure imbalance, muffled hearing, and, in chronic cases, middle ear effusion. Tympanometry typically reveals a type C tympanogram (negative middle ear pressure) in obstructive ETD. Editors must distinguish ETD from OME: ETD is a functional diagnosis whereas OME refers to the specific presence of fluid. The term 'patulous Eustachian tube' describes the opposite failure—chronic opening—and must not be conflated with obstructive ETD.
Usage
Usage note: Distinguish between obstructive and patulous forms; the two have opposing symptoms and must not be grouped under a single umbrella in clinical writing.
In Context
- "Eustachian tube dysfunction was suspected following a type C tympanogram with a peak at –180 daPa." — Audiological diagnostic report
- "The author conflated Eustachian tube dysfunction with OME; these are related but distinct diagnoses that require separate entries in the report." — Editor's annotation