小児腺様増殖症治療指針へのチンパノメトリーの応用

概要

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Tympanograms and stapedial reflexes using otoadmittance meter, and audiograms were analyzed in 215 children (430 ears) between 4 to 12 years of ages who were diagnosed as having adenoid vegetation in ENT clinic of Kitano Hospital during january in 1975 and September in 1978. Adenoidectomy was performed in 109 patients under general anesthesia.In children of adenoid vegetation, B type tympanogram was observed in more than half cases. Many cases with B type tympanograms showed hearing disorders and negative stapedial reflexes. On the other hand, normal audiograms were obtained in the most cases with A type tympanograms.After adenoidectomy, the improvement of hearing threshold in an averaged speech frequency range and 4kHz was observed in the first place, then, B type tympanogram was aluered to A or C type, and lastly, stapedial reflexes became positive in about 70 percent of the operated cases. The improvement in the hearing threshold, the tympanogram pattern and the stapedial reflex were noted within 30 to 60 days after adenoidectomy. It was concluded that adenoidectomy was indicated in the cases showing B type tympanogram with hearing disorder, and the postoperative observation should be continued til the positive stapedial reflex was obtained.
社団法人日本耳鼻咽喉科学会の論文