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Body sway in the upright standing posture of patients with equilibrium disturbances was examined by stabilometry. Routine and precision tests recommended by the Board of the Japan Society for Equilibrium Research were performed. I. Routine test results Body sway while standing was investigated in 88 patients by routine tests, which included forwardbackward diameter, left-right diameter, Romberg rado and pattern of sway.The 88 patients were classified into 5 groups: (1) 10 with bilateral loss of labyrinthine excitability; (2) 57 with unilateral loss of labyrinthine excitability; (3) 17 with cerebellar disturbances; (4) 3 with spinal disorders; (5) 1 with peripheral neuropathy. 1. In Group 1, forward-backward diameter, leftright diameter and/or Romberg ratio of sway was increased. The sway pattern was of the diffuse type in most. 2. In 29 patients in Group 2, forward-backward diameter, left-right diameter and/or Romberg ratio was increased, and left-right sway was observed. 3. Sixteen patients in Group 3 had a diffuse large sway pattern. 4. Group 4 patients had a large sway, forwardbackward or diffuse. IT. Precision test results Six patients with abnormal sway patterns that were specific for a given localization of the disease were examined by the precision test which included unit locus length, forward-backward and left-right diameter, area, ellipse, center of the sway, velocity, standard deviation, skewness and kurtosis of amplitude probability density distribution, vector of velocity and power spectrum. The diagnoses were bilateral loss of labyrinthine function of unknown origin, right sudden deafness with unilateral loss of labyrinthine excitability, arterio-venous malformation of the cerebellum, infarction of a cerebellar hemisphere, caisson disease and Charcot-Marie-Tooth disease. 1. In the patient with bilateral loss of labyrinthine function, the sway of the center of gravity showed a large forward/backward sway with a regular periodicity of about 0.6 Hz. 2. Body sway of the patient with sudden deaf-ness showed a large left-right sway with 0.08-0.2 Hz. 3. Body sway of the patient with arterio-venous malformation showed a large and diffuse sway with a regular periodicity of about 0.7 Hz. 4. Body sway of the patient with cerebellar infarction indicated a slight increase of the area and velocity of the sway. 5. In caisson disease, the unit locus length, diameter and velocity of the forward-backward sway was markedly increased. 6. In Charcot-Marie-Tooth disease, the area of the sway and the velocity of the forward-backward sway was increased.
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重心動揺検査の検討,検査条件について

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