Reker U, Rudert H
Laryngol Rhinol Otol (Stuttg). 1976 Oct;55(10):860-6.
A pseudocaloric nystagmus is, in its strict sense, a spontaneous nystagmus activated by the unspecific stimulus of syringing the auditory canal. 40 patients with a unilateral, peripheral-vestibular defect were examined electronystagmographically. With most patients the 30 degrees caloric stimulation gave an incorrect result of the degree of hypoexcitability with all parameters (duration, maximum frequency and maximum intensity). This incorrect result was most pronounced with patients after neurectomy of the vestibular nerve, who frequently had a heavily reduced reaction of the healthy ear. For quantitative measurement of genuine pseudocaloric effects, by a special method of examination (as for instance by consideration of the "maximum spontaneous nystagmus"), the "real" vestibular excitability was calculated. Data exceeding this value were regarded as genuine pseudocaloric nystagmus. At stimulation temperatures of 44 degrees to 17 degrees C they were so low as to be negligible. They were only found with 5 of the 40 patients and amounted to only 10-20% of the reaction of the healthy ear. However, with ice water there frequently were considerable pseudocaloric reactions. So testing with ice water is not appropriate.
严格来说，伪热眼震是由冲洗耳道这一非特异性刺激激活的自发性眼震。对40例单侧周围性前庭缺陷患者进行了眼震电图检查。对于大多数患者，30度冷热试验在所有参数（持续时间、最大频率和最大强度）上都给出了关于兴奋性降低程度的错误结果。在前庭神经切除术后的患者中，这种错误结果最为明显，这些患者健康耳朵的反应常常大幅降低。为了定量测量真正的伪热效应，通过一种特殊的检查方法（例如考虑“最大自发性眼震”）计算“真正的”前庭兴奋性。超过该值的数据被视为真正的伪热眼震。在44摄氏度至17摄氏度的刺激温度下，这些数据非常低以至于可以忽略不计。在40例患者中只有5例出现这种情况，且仅占健康耳朵反应的10% - 20%。然而，用冰水刺激时常常会出现相当大的伪热反应。所以用冰水进行测试并不合适。
