Abstract
THE EFFECTS OF TYMPANIC MEMBRANE PERFORATIONS ON THE DETECTION OF DISTORTION PRODUCT OTOACOUSTIC EMISSIONS

Nemer AlKhtoum Ebeorl-Hns Facs*, Hussein Alqassem phd, Shawkat AlTamimi MD, Osama Alalwan MD and Abedlrazzaq Alrfooh MD

ABSTRACT

Objectives: To investigate the effects of human’s tympanic membrane perforations on distortion product otoacoustic emissions. Patients and Methods: 42 patients who had tympanic membrane perforations aged between 16 and 60 years of both genders were included in the study which carried out at King Hussein Medical centre (Jordan) between 4th of august 2015 and 10th of May 2021. Otoscopic examination performed by ENT doctors, followed by pure tone audiometery using clinical diagnostic audiometer and distortion product otoacoustic emissions using Escort system were carried out on each ear of the subjects by a qualified audiologist and in an isolated booth. Results: Distortion product Otoacoustic emissions (DPOAEs) in ears with small perforation size less than 25% were significantly lower than those in the intact membranes at low frequencies P <0.05 but not significantly lower at high frequencies. Perforation size of 40-50% severely affected DPOAEs results; they were significantly lower than those in the intact membranes P< 0.05. Perforation size more than 70% severely affected DPOAEs results that the emissions did not differ from the noise floors P < 0.05. Conclusion: presence of small tympanic membrane perforations doesn’t preclude the detection of distortion product otoacoustic emissions. However, large perforations affected the detection of emissions in the low frequencies region.

Keywords: Distortion product otoacoustic emissions, Tympanic membrane perforation, pure tone audiometery, conductive hearing loss, hearing threshold.


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