Eustachian tube patency refers to how much the eustachian tube is open. The eustachian tube runs between the middle ear and the throat. It controls the pressure behind the eardrum in the middle ear space. This helps keep the middle ear free of fluid.
The eustachian tube is normally open, or patent. However, some conditions can increase pressure in the ear such as:
These can cause the eustachian tube to become blocked.
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O'Reilly RC, Levi J. Anatomy and physiology of the eustachian tube. In: Flint PW, Francis HW, Haughey BH, et al, eds. Cummings Otolaryngology: Head and Neck Surgery. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 130.
Review Date 7/28/2022
Updated by: Charles I. Schwartz, MD, FAAP, Clinical Assistant Professor of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, General Pediatrician at PennCare for Kids, Phoenixville, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.