Vertiginous flyer: a review of 6 years' experience of the aeromedical consultation service.
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A 43-year-old woman was found to have multiple cranial neuritis affections, present as an isolated disorder over a long period, and characterized by bilateral deafness and associated lesions of the VII and V cranial nerves. On investigation, visual disturbances were discovered which were of a transitory nature and made up a total clinical picture suggesting Cogan's syndrome. Neuropathological examination revealed the presence of typical periarteritis nodosa lesions in the cranial nerves. The authors suggest, therefore, that certain cases described as Cogan's syndrome are in fact particular forms of periarteritis nodosa.
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In order to investigate otolith function, horizontal eye displacement in total darkness during tilting laterally about body axis was examined in 23 normal subjects and 29 patients with vestibular lesions. The mean and standard deviation of this eye displacement in normal subjects were 18.9 + 6.1 degrees at 15 degrees of body-tilt. Thus, eye displacement below the lower tolerance limit of normal eye displacement at 15 degrees of body-tilt, that is, 8.8 degrees, was judged to be abnormal. Meanwhile, 12 cases or 41.4% of 29 patients with vestibular lesions showed abnormal eye displacement in this test. Especially in cases with positional vertigo and/or dizziness, the occurrence of abnormal results in this test (69%) was far higher compared with that of cases where vertigo and/or dizziness was not associated with postural changing (19%). Therefore, these abnormal results seem to be closely related to the disorder of otolith system.
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