Patulous Eustachian Tube is a clinical condition characterized by abnormal patency of the eustachian tube. This anomaly permits the movement of air into and out of the middle ear by means of the eustachian tube during nasal breathing.
The tympanic membrane moved outward when the patient exhales, owing to the transmission of positive nasopharyngeal air pressure (relative to the atmospheric pressure) to the middle ear. When the patient inhales, the tympanic membrane moved inward because of the opposite mechanism.
Adopting a recumbent position relieved the symptoms because of increased venous stasis and passive compression of the eustachian tube. A patulous eustachian tube is associated with pregnancy, rapid weight loss, mucosal atrophy (e.g., that due to atrophic rhinitis or occurring after radiotherapy), or muscular dysfunction. In many instances, however, a satisfactory explanation cannot be found.
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