Late hearing results in 627 ears (574 patients) operated on radically for chronic otitis media are presented. Clinically, the ears were followed-up annually for 5–14 years. The results are correlated with the severity of histopathological changes in the tympanic cavity and in the mastoid air-cell system and also with the management of the tympanic mucosa and ossicular chain at operation.
The mean post-operative air-bone gap was significatly better in ears with mild histopathological changes than in ears with sever histopathological changes in the middle ear (17.0 db./33.1 db.; p<0.001) or mastoid (29.0 db./34.2 db.; p<0.01) at operation. The difference in hearing results in favour of the former group was more significant in ears in which the tympanic mucosa had been saved at operation (p<0.01/p<0.001) than in ears in which the mucosa had been removed (p<0.05).
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