迷路障害例の遮眼文字--書軸長の短縮と延長について

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The blindfolded vertical writing test using the right hand was conducted on eight patients with definite vestibular impairment. This included three cases of inner-ear impairment due to Streptomycin sulfate, one case of vestibular neuritis and four cases of Ménière's disease.The test showed four patients to have abnormal deviations, and five patients with shortening or elongation of the writing axes that was considered to be abnormal when compared to a normal control group. In total, seven of the eight were evaluated to be abnormal.Simultaneous to this writing test, the arm-tonus-reaction (ATR) test was given to five patients. For patients with a shortened writing axis, the right upper limb of ATR was located in the upper position, whereas for the elongated writing axis patients, it was located in the lower position.The authors therefore studied upper limb deviations in seven healthy male subjects in their twenties:With the posture for the ATR as an index, the deviations of the upper limb were observed after rotating each semicircular canal. From this observation it was shown that stimulation of only the lateral semicircular canal produced the deviation specifically to the left or right, and that stimulation of the vertical semicircular canal produced deviation of the upper limb to the upper or lower positions, i. e. raising or lowering of the upper limb was produced.From these findings, it was considered that deviation to the left and right during the writing test suggested impairment of the lateral semicircular canal, and that the shortening or elongation of the writing axes showed impairment of the vertical semicircular canal.
耳鼻咽喉科臨床学会の論文

迷路障害例の遮眼文字--書軸長の短縮と延長について

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