Yin S, Sun L, Li D
Jinzhou Medical College.
Zhonghua Er Bi Yan Hou Ke Za Zhi. 1994;29(5):274-7.
Comparative analysis of low frequency (0.01-0.64Hz) sinusoidal harmonic acceleration (SHA) responses of 50 patients with bilateral caloric weakness (summed slowphase velocities SSVs < or = 20 degrees/s) revealed that SHA stimuli reflected not only the existence of bilateral caloric weakness but also the impairment degree. The phase values of the patients with SSVs < or = 10 degrees/s were greater than that of the patients with SSVs > 10 degrees/s and the normals, and the gain values of the patients with SSVs < or = 10 degrees/s were smaller than those with SSVs > 10 degrees/s and the normals. The patients with SSVs < or = 10 degrees/s showed more severe impairments than those with SSVs > 10 degrees/s. However, even in the frequencies having higher impairment identifying rate, such as 0.01 and 0.02 Hz, about 30 percent of the patients with SSVs < or = 10 degrees/s revealed rotational responses that were within normal limits. These findings indicated that even marked bilateral caloric reduction is in sufficient to diagnose vestibular loss.
对50例双侧冷热试验减弱（慢相速度总和SSV≤20度/秒）患者的低频（0.01 - 0.64Hz）正弦谐波加速度（SHA）反应进行比较分析，结果显示SHA刺激不仅反映了双侧冷热试验减弱的存在，还反映了损伤程度。SSV≤10度/秒患者的相位值大于SSV＞10度/秒的患者和正常人，而SSV≤10度/秒患者的增益值小于SSV＞10度/秒的患者和正常人。SSV≤10度/秒的患者比SSV＞10度/秒的患者损伤更严重。然而，即使在损伤识别率较高的频率，如0.01和0.02Hz，约30%的SSV≤10度/秒患者的旋转反应仍在正常范围内。这些发现表明，即使双侧冷热试验明显降低也不足以诊断前庭功能丧失。
