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I.緒言
慢性関節リウマチ(rhcumatoid arthritis以下RAと略す)は,四肢の多発性関節炎を主徴とする全身疾患であり,関節の病変,主としで胃の破壊・癒着をきたすとされている。耳鼻咽喉科領域でも,喉頭の病変,特に輪状披裂関節については,古くから議論され,最近では大石1)により臨床的ならびに病理組織学的に詳細な研究がなされている。
一方,耳小骨連鎖系においても,キヌタ・アブミ関節は関節包につつまれた関節2)であり,四肢の関節と同様の変化をきたすことが推測される。この点についてRA患者のtympanogramを中心に検討を試みたので,若干の考察を加えて報告する。
Impedance audiometric measurements were obtained in 24 patients with classical rheumatoid arthritis and their tympanograms were studied. A Madsen ZO 72 impedance audiometer was used and probe tone frequencies were 226 and 660Hz. At both frequencies, more than 30% of the ears showed other types rather than type A tympanogram. Only at 660Hz probe tone were there the notched tympanograms in 13% of the ears. Therefore we postulated the relationship between a notched tympanogram and a middle ear function damaged by rheumatoid arthritis, and concluded that the middle ear function might be changed by rheumatoid arthritis. Further study on the types of tympanograms and ankylosis of the incudostapedial joint should be needed.
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