下眼瞼向垂直性眼振のベクトル変化に関する考察

概要

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Down beat nystagmus was analysed by two channel electronystagmography and influences of the head and eye positions on the horizontal and vertical components of nystagmus were discussed. From the results of this investigation, down beat nystagmus was classified into two types: typical and atypical.In the typical type of down beat nystagmus, the vertical component always appeared simultaneously with the onset of the horizontal component, and the direction of nystagmus was shown as the vector of two components.Such simultaneity of the two components was not always observed in the atypical type of down beat nystagmus. When the vertical component did not correspond with the onset of the horizontal component, pure vertical nystagmus was observed. However, when the two components appeared at same time, the direction of nystagmus changed irregularly by the influence of the horizontal component. The typical type was observed in patients of syringobulbia and basilar impression. The atypical type was seen in those of spinocerebelar degeneration and subdural abscess.
耳鼻咽喉科臨床学会の論文