ETIOLOGY, INCIDENCE AND PREVALENCE OF OSSICULAR CHAIN EROSION AMONG MUCOSAL AND SQUAMOUS TYPES OF CHRONIC SUPPURITIVE OTITIS MEDIA- AN OBSERVATIONAL STUDY
Background: Chronic suppurative otitis media (CSOM) implies a permanent abnormality of the tympanic membrane, either in its pars tensa part or pars flaccid part, which is most likely a result of earlier acute otitis media, negative middle ear pressure, trauma or otitis media with effusion.
Objectives: We have conducted this study to evaluate prevalence, incidence and common etiology of ossicular chain erosion among both mucosal and squamous types of CSOM patients.
Methods: Admitted patients with CSOM were subjected to detailed history taking, complete general examination, systemic examination, otoscopic examination, audiological tests like conversation test, whisper test, tuning fork tests, vestibular function tests and examination under microscope. The patients also underwent investigations like PTA and radiological investigations like Modified Mayer X ray, Law’s view x ray for all patients or CT scan of the temporal bone when necessary.
Results: Out of 150 patients, mucosal CSOM was found in 87 cases (58%) and squamous CSOM was found in 63 cases (42%). The most commonly affected age group in CSOM patients of our study was between 16 and 25 years. Incus erosion was seen in 42% of cases, stapes erosion in 20.67%, malleus erosion in 15.33%, 24% of cases had discontinuation of malleo– incuidal joint and 37.34% of cases had incudo– stapedial joint discontinuity.
Conclusion: We have successfully observed the ossicular chain status of 150 cases of CSOM to find out the causes of ossicular erosion among the mucosal and squamous types of CSOM. The results were promising and definite for forming any conclusion. This study will help in future research for diagnosing CSOM.
Keywords: Chronic Suppurative Otitis Media (CSOM), Hearing Loss, Incus, Malleus, Stapes, Ossicular Erosion.