الفهرس 
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Abstract
The Patulous Eustachian Tube (PET) has long been considered a unique but less far common disorder that has an estimated incidence from 0.3 % to 6.6 % in general population PET is more likely to develop after weight loss, radiation therapy, allergies, or gastroesophageal reflux, but it is idiopathic in the majority of patients.
The most common PET symptoms are autophony (hearing one’s own speech) and aerophony (hearing one’s own breathing), as well as aural fullness
The gold standard for diagnosing PET is synchronized movement of the TM with respiration during ear endoscopic examination; however, the acoustic reflex decay test is an essential test for diagnosing patulous ET. The acoustic immittance to a probe tone is measured in this test state using the ”reflex-decay” settings in commercial tympanometers. (usually 226 Hz). The TM’s inward and outward excursions during respiration cause a cyclical change in immittance.
The aim of this research is to determine the sensitivity of the acoustic reflex decay test in diagnosing patients with patulous Eustachian tubes in the ENT department of Suez Canal University Hospitals.
The study enrolled adults who seek medical advice in the ENT department at Suez Canal University complaining of autophony or aural fullness and diagnosed with patulous Eustachian tube using endoscopic testing of synchronous movement of tympanic membrane with respiration.