The benefit of tympanometry for certain ear diseases

Adnan Yaqoop,Hussam Salman,Rafid Y Almaidi

doi:10.33762/bsurg.2021.130727.1007

Abstract

Tympanometry is an objective test measure the mobility (compliance) of the tympanic membrane as a function of applied air pressure in external canal, It is particularly useful in assessing the secretory otitis media during childhood. This is a prospective study performed at ENT department of the Basrah Teaching Hospital for the period from November / 2013 to February / 2014. The study is to assess the advantage of tympanometry as a diagnostic tool and to audit the uses of tympanometry in the ear diseases in ENT department of Basrah Teaching Hospital. The statistical calculations were carried out using chi-square test. The p value >0.05 was considered statistically insignificant. Fifty patients aged (4—84years) who were referred by otolaryngologist to our audiological unit for audiological assessment were included in the study. Out of these 50 patients (55 ears had otitis media with effusion, 12 ears had Eustachian tube dysfunction, 4 ears had barotraumas, 7 ears had acute otitis media, 4 ears had chronic suppurative otitis media, 2 ears had otosclerosis and 15 ears were normal on clinical examination). The clinical diagnoses was compared with tympanometric findings and the coincidence between two, was as follow; 80% in otitis media with effusion, 75% in barotraumas , 100% in acute otitis media. In conclusion; tympanometry is an important tool in the diagnosis of some of the ear diseases. It is not necessary to performed in every case as the clinical examination could clarify the diagnosis in most cases . Keywords: benefit , tympanometry

Highlights

The term acoustic admittance describes the mobility of vibrating structure
The tympanometry coincide with clinical diagnoses in 80 % of cases this result does not goes with Helsinki, Finland study which showed that tympanometry was technically successful in 94% of ears 3
Another study was done in king Saud university, Riyadh showed that prevalence rate of type B tympanometry was 8.2% and prevalence of otitis media with effusion (OME) was 7.5 % 7, while our study showed percentage of type B tympanometry was 50 % and percentage of OME was 55 %, because not all cases gives type B tympanogram 3

Summary

Introduction

The term acoustic admittance describes the mobility of vibrating structure It is the ratio of velocity of the middle ear displacement to the applied sound pressure, it measures at low frequency 220Hz. Ahighly mobile ear will present at high admittance to an incoming sound wave. (Middle ear pressure, acoustic admittance, and tympanometric gradient are the main test parameters). The range of normal middle ear pressure is between (-100...+50mmH2O) and represent normal Eustachian tube function. 3. Type C seen in negative ear pressure or when there is Eustachian tube dysfunction, this subdivided into C1 middle ear pressure between –100 to-199 mmH2o , C2 ,middle ear pressure between –200----to –400 it indicates retracted tympanic membrane. Eustachian tube with mild dysfunction demonstrated as type C tympanogram, the conductive hearing loss does not exceed 25 dB. Type Ad deep type or hyper complaint in flaccid tympanic membrane or disarticulation or partial or total ossicular chain loss

Patients and methods

Results

Discussion

Conclusion