眼振とその診断—メマイ・平衡障害における自発ならびに誘発眼振の鑑別診断的意義

DIAGNOSTIC SIGNIFICANCE OF SPONTANEOUS AND POSITIONAL NYSTAGMUS IN CASES WITH VERTIGO AND DISEQUILIBRIUM

　Ⅰ．はじめに

　眼球は身体のなかでもつとも微細に，しかも滑らかに動く器官であるが，この眼球運動を詳細に検討することがいろいろの疾患の診断にきわめて重要な役割を果す場合が少なくない。

　たとえば前庭系になんらかの障害が存在するとひとつにはそれが眼振として顕著に，しかも他覚的に観察されるため前庭系の機能を考察するうえでこの眼振の観察が重要な指針となる。

Based on examination results of 539 cases of vertigo and disquilibrium in whom the diag-nosis was confirmed by means of surgery, detailed neurological examinations or postm-ortem examination, observations were made on the diagnostic significance of spontaneous and positional nystagmus. Spontaneous and gaze nystagmus were classified into 10 different types and an attempt was made to correlate each of them to corresponding peri-pheral and central lesions.