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</noscript></div><div class="main"><div id="ency_summary"><p>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.</p><p>The eustachian tube is normally open, or patent. However, some conditions can increase pressure in the ear such as:</p><ul><li><a test="test" href="./000638.htm">Ear infections</a></li><li>Upper respiratory infections</li><li><a test="test" href="./002077.htm">Altitude changes</a></li></ul><p>These can cause the eustachian tube to become blocked.</p></div><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1092t.jpg" alt="Ear anatomy" title="Ear anatomy" class="side-img"/><a href="../imagepages/1092.htm">Ear anatomy</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/9308t.jpg" alt="Eustachian tube anatomy" title="Eustachian tube anatomy" class="side-img"/><a href="../imagepages/9308.htm">Eustachian tube anatomy</a></li>
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</div></div><div class="section-body" id="section-Ref"><p>Kerschner JE, Preciado D. Otitis media. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. <em>Nelson Textbook of Pediatrics</em>. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 658.</p><p>O'Reilly RC, Levi J. Anatomy and physiology of the eustachian tube. In: Flint PW, Francis HW, Haughey BH, et al, eds. <em>Cummings Otolaryngology: Head and Neck Surgery</em>. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 130.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 7/28/2022</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>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. </p>
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