Becker G D, Davis J L, Parell J
Arch Neurol. 1978 Feb;35(2):93-4. doi: 10.1001/archneur.1978.00500260031007.
Pseudocaloric nystagmus (PCN) is an appropriately beating nystagmus induced by cold caloric irrigation of an ear with abolished vestibular function. The nystagmus is not the result of endolymph flow but probably represents unmasking a latent nystagmus by altering the patient in this case, through tactile (caloric) stimulation. Pseudocaloric nystagmus has the following characteristics: (1) mild intensity (eyes closed-slow phase velocity usually less than 8 degrees/sec), it has not been observed with the eyes open, (2) always beats away from the diseased ear; therefore, any nystagmus induced by cold irrigation will be appropriately (contralateral) beating while that induced by warm irrigation will be inappropriately (contralateral beating; 3) the induced nystagmus will not reverse direction after inverting the ampulla. Establishing bidirectional sensitivity of the cupula by demonstrating appropriately beating nystagmus to ampullopetal and ampullofugal flow of endolymph not only assures that the lateral semicircular canal (SCC) is functionally intact to caloric stimulation but will avoid errors in electronystagmorgraphic (ENG) interpretation.
伪热眼震（PCN）是通过对前庭功能已丧失的耳朵进行冷热水冲洗诱发的一种方向正常的眼震。这种眼震并非内淋巴流动的结果，而可能是通过触觉（冷热）刺激改变患者状态，从而使潜在眼震显现出来。伪热眼震具有以下特点：（1）强度较弱（闭眼时慢相速度通常小于8度/秒），睁眼时未观察到；（2）总是背离患侧耳朵方向跳动；因此，冷冲洗诱发的任何眼震方向都正常（向对侧跳动），而热冲洗诱发的眼震方向异常（向对侧跳动）；（3）壶腹倒置后诱发的眼震方向不会反转。通过证明内淋巴向壶腹和离壶腹流动时眼震方向正常来确立壶腹嵴的双向敏感性，不仅能确保外半规管（SCC）对冷热刺激功能完整，还能避免眼震电图（ENG）解释出现错误。
