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Diagnosis of Patulous Eustachian Tube (PET)
These diagnostic method will not be applied unless the otologist is actively considering Patulous Eustachian Tube in his differential diagnosis.
G E Shambaugh(1938)
- The diagnosis of continuously open eustachian tube is easily made with an auscultation tube fro the patient's ear to the examiner's ear. If the tube is open, the patient's voice is heard clearly though the auscultation tube and has a rough, hollow quality, while his breathing is heard as an intermittent hollow roaring sound.
P J Robinson(1989)
- The diagnosis can often be made on the history alone. Carefull examination of the tympanic membrane may reveal movement synchronous with nasal respiration. The microscope may be used, with the patient sitting upright to facilitate detection of small movements of the pars flaccida, which disappear when the patient is supine. Similar movement may also be detected on tympanometry.
S Ishikawa(1992)
- The diagnosis of PET is made by abnormal tympanic membrane movement synchronous with hyperventilation, which is detected with impedance audiometry(reflex mode).
 At Rest
 Hyperventilation
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