実験的めまいと平衡失調 : ―めまいの客観化に必要な検査について―

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The character of vertigo suffered by patients is various.There are not only typical rotatory sensation but unsteadiness, dizziness and black out.In order to standardize the methods to get an objective evidence of these kinds of vertigo, the following study was carried out.Otologists can induce vertigo by experimental labyrinthine and optokinetic stimuli. Ataxia ac- companied by experimental vertigo was observed by means of cephalograph, writing test, discus throw- er position, nystagmus and electroencephalography. The relationship between the character of vertigo and distinctive character of ataxia was investigated. A) Studies on relationship between experimen- tally induced labyrinthine vertigo and ataxia. 1) On the relationship between vertigo and ataxia caused by rotatory stimulation. 2) On the relationship between vartigo and ataxia caused by thermic stimulation. 3) On the relationship between vertigo and ataxia caused by galvanic stimulation. 4) On the relationship between vertigo and ataxia caused by linear movement. B) Studies on relationship between experimen- tally induced optokinetic verigo and ataxia. As the result of these studies it was found that the vertigo induced by labyrinthine stimuli is various in character depending on whether it is induced by rotatory, caloric and galvanic stimula- tion and or by linear movement. Rotatory stim- ulation induced sensation of rotation (Drehschwin- del), thermic stimulation induced unsteadiness, weakness or dizziness, galvanic stimulation induced sensation of falling and linear movement induced unsteadiness or dizziness (Schwankschwindel). Corresponding with to these varieties of character of vertigo, the nature of ataxia differed in appear- ance as indicated by observations of swinging of the body, labyrinthine deviation, arm-tonus-reaction and nystagmus. Therefore, in order to get objec- tive evidence of various kinds of vertigo suffered by patients, tests of righting reflex, labyrinthine deviation and nystagmus are necessary. Optokinetic and postrotatory vertigo and nystag- mus in these subjects showed that labyrinthine vertigo was the complaint while postrotatory nys- tagmus was occuring, but optokinetic vertigo was present when optokinetic nystagmus had diminished in spite of continued stimulation. Namely, the relationship between optokinetic nystagmus and vertigo is opposited to the relationship between postrotatory nystagmus and vertigo.
社団法人日本耳鼻咽喉科学会の論文

実験的めまいと平衡失調 : ―めまいの客観化に必要な検査について―

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