鼓膜張筋けいれんを伴ったいわゆる耳管性耳鳴の一症例

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  • Tubal tinnitus with contractions of the tensor tympani muscle: A case report.

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A 30-year-old man complained of clicking sound in both ears. Sound analysis showed that the tinnitus had a duration of 0.12 second, a frequency range of 2 to 4.8kHz and an irregular rhythm of 60-120per minute. Nasopharyngoscopy under local anesthesia disclosed spasmodic lateral movements of the lateral tubal wall. Electromyography revealed that only the tensor veli palatini muscle showed drastic and involuntary contractions during episode of tinnitus. Tinnitus disappeared when a bougie was inserted into the tube. These findings showed that the tinnitus was caused by contractions of the tensor veli palatini muscle, what is called a tubal tinnitus.<br>Inward movement of an incised tympanic membrane demonstrated simultaneous contractions of the tensor tympani muscle and the tensor veli palatini muscle during tinnitus.<br>An experimental middle ear and tubal model demonstrated that a decrease in the impedance of the tympanic membrane during tinnitus might be attributed to volume expansion of the external auditory meatus by an inward movement of the drum.

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