慢性中耳炎・真珠腫性中耳炎の軽症化についての検討

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  • Increase of the incidence of a mild type in chronic and cholesteatoma otitis media.

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The purpose of this report is to analyze the degree of inflammation in chronic otitis media (COM) and cholesteatoma at preoperative states.<BR>Primary ear surgery was preformed on 299 ears from December 1994 to November 1998 at Hyogo College of Medicine. COM was found in 170 ears (56.8%) and cholesteatoma in 129 ears (43.2%). The types of cholesteatoma included pars flaccida type in 93 ears (72.1%), pars tensa type in 26 (20.2%), and congenital type in 10 (7.7%). Preoperative states were investigated from operative records, regarding chief symptoms, hearing level, surgical methods and intraoperative findings.<BR>Results of COM were as follows: ears without otorrhea were found in more than 40%, and ears suffering from continuous otorrhea were less than 15%. Bone conduction hearing levels within 20dB were found in about 45%. Intact ossicular chains were found in about 85%, and tympanoplasty type I and simple underlay myringoplasty were performed in about 85%.<BR>Results of cholesteatoma were as follows: bone conduction hearing levels within 20 dB were found in 60% of pars flaccida type, and in 35% of pars tensa type. Ears with intact ossicular chains were found in 50% of pars flassida type, and in 25% pars tensa type.<BR>These findings suggested that cases of mild inflammation have recently increased in COM and cholesteatoma.

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