幼小児における各種難聴耳のティンパノグラムとその分類について
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概要
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Tympanometry using Danplex ZA-20 with a probe-tone of 220Hz was performed on the total of 1470 ears with normal hearing and various kinds of hearing impairment. The subjects ranged in age from 2 to 15 years. Nine tympanic patterns from type I to IX were classified based upon tympanic membrane compliance, peak pressure and shape of tympanogram. The classification of tympanogram adopted in this study was almost similar to the one described by Jerger et al. in 1972 : Type 1 corresponded to type A of Jerger, tye II to tye AD, type III to type As, typ IV and type V to type C, and type VIII to type B. However, type VI and type VII were characterized by great tympanic membrane compliance, displacement of the peak toward the side of high negative pressure and a sharp peak at the point of maximum amplitude. These types did not correspond to any of Jergers classification and the others. The characteristic patterns of type VI and type VII have been frequently found clinically among patients with flaccid tympanic membrane, and the resolving stage of fluid in the middle ear. Type IX was an unusual pattern which did not apparently fit into any of the above classifications. Tympanometry is particularly useful in a pediatric population were middle ear disease is so frequently encountered. Nevertheless, peak pressure value and tympanic membrane compliance value were not necessarily a reliable indicator for differentiation of normal middle ears and pathological middle ears from each other. The sharp of maximum peak in compliance as a function of the pressure must also be evaluated
- 社団法人 日本耳鼻咽喉科学会の論文
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