Tehran University of Medical Sciences Auditory and Vestibular Research 2423-480X 25 4 2016 12 11 215 220 EN Mansoureh Adel Ghahraman Department of Audiology, School of Rehablitation, Tehran University of Medical Sciences, Tehran, Iran Seyed Hadi Samimi Ardestani Department of Otorhinolaryngology, Amiralam Hospital, Tehran University of Medical Sciences, Tehran, Iran Khosro Sadeghniiat Haghighi Occupational Sleep Research Center, Baharlou Hospital, Tehran University of Medical Sciences, Tehran, Iran 2016 08 30 2016 11 22 Background and Aim: Some risk factors for obstructive sleep apnea (OSA) such as upper respiratory airways abnormalities and obesity overlap with the risk factors for Eustachian tube dysfunction (ETD). In this study, we investigated the prevalence of ETD in a population of patients with OSA. Methods: Tubal dysfunction was determined by tympanometry and inflation-deflation test in 36 patients diagnosed with severe OSA and 20 normal participants. Results: More than 80% of patients with OSA had concomitant ETD at least in one ear. Obese participants had a smaller tympanometric peak pressure (TPP) shift after inflation-deflation test than non-obese subjects. There was no signifycant correlation between TPP shift and duration of OSA. Conclusion: High prevalence of concomitant ETD was determined in patients with severe OSA and obese individuals. Tubal function testis suggested in patients referred for OSA evaluation. https://avr.tums.ac.ir/index.php/avr/article/view/119 https://avr.tums.ac.ir/index.php/avr/article/download/119/64