慢性中耳炎におけるめまいの様相

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  • Vertigo Related to Chronic Otitis Media
  • マンセイ チュウジエン ニ オケル メマイ ノ ヨウソウ

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Neurotological examinations were performed in patients with vertigo caused by chronic otitis media. The total number of patients was 23, consisting of 11 males and 12 females. Age distribution ranges from 25 to 71 years with an average of 50 years. Patients' complaints were varied, however whirling type of vertigo was a common complaint in several cases with active labyrinthitis. Under wearing Frenzel's glass, spontaneous nystagmus of more than I degree was observed in 40% of the patients, positional nystagmus in 27% and positioning nystagmus in 32%. Under electronystagmography, the detection rate of spontaneous nystagmus was increased. Although most of the cases with spontaneous nystagmus were directed toward the intact side, a few cases were directed toward the lesion side. Saccadic or unidirectional saccadic pursuit was found in 30% and an abnormality in optokinetic after nystagmus test was found in 70%. The occurrence rate of abnormalities in the equilibrium examinations was somewhat high in cases with decreased hearing acuity. In two cases, a fistula was found in the lateral semicircular canal during surgery, however positive fistula sign were not observed preoperatively.

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