Özet:

Background: COM is characterized as an inflammatory condition associated with a persisting perforation of the Tympanic membrane (TM) and chronic otorrhoea for more than 3 months. The main purpose of this study was derived from the fact that nasopharynx act as a common portal for drainage for both ears through left and right Eustachian tube, and hence factors responsible for COM on one ear may also affect the other ear. Materials & Methods: This is a prospective study done on 100 patients attending with unilateral COM without perforation or history of ear discharge in the contralateral ear in department of ENT at government medical college, Sikar, Rajasthan during one year period. All age groups were included. Contralateral ear is defined as the asymptomatic ear or the ear with no history of ear discharge or hearing impairment. All the patients were evaluated for the presence of changes in the contralateral ear according to complete history and clinical examination, otoscopic findings, pure tone audiometry, X-ray mastoid (lateral oblique view) and/or high-resolution computed tomography (HRCT) temporal bone wherever indicated. Results: The mean age of patients was 28.7 yrs, male to female ratio was 1.5:1. The incidence of mucosal type of COM was 88% (88 patients) which was more than squamosal type of COM 12% (12 patients). Hearing status in the contralateral ear was analysed and it was found that normal hearing was present among 43 patients of mucosal type of COM and 2 patients of squamosal type of COM. 49 (49%) patients had conductive hearing loss in contralateral ear among which 40 patients had mucosal type of COM and 9 patients had squamosal type of COM in the affected ear. Conclusion: We can conclude that according to our study, those who had squamosal type COM had more abnormal contralateral ears than those who had mucosal type COM.

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