Murofushi T, Mizuno M
Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan.
ORL J Otorhinolaryngol Relat Spec. 1994;56(1):40-4. doi: 10.1159/000276606.
We investigated the postcaloric nystagmus related to positional change. Twenty-two healthy subjects were examined (experiment 1). A caloric test was carried out in the supine position. Following the cessation of the primary phase, the subject was reoriented to the upright position. An additional 10 subjects were also examined with other positional changes (experiment 2): following the cessation of the primary phase, the subject was reoriented to the lateral positions, irrigated-ear-up and irrigated-ear-down positions. As a control study, 6 subjects were examined without positional change (experiment 3). In 37 (84%) ears, postcaloric nystagmus was observed in the upright position. Furthermore, in 12 of 20 (60%) ears in the irrigated-ear-up position and in 13 of 20 (65%) ears in the irrigated-ear-down position, the horizontal component of postcaloric nystagmus was observed. Without positional change, no postcaloric nystagmus was observed. These findings indicate that caloric nystagmus is modified by an adaptive process and that postcaloric nystagmus as it relates to positional change might be attributed mainly to the vestibular adaptation.
我们研究了与体位变化相关的冷热试验性眼震。对22名健康受试者进行了检查（实验1）。在仰卧位进行冷热试验。在主相停止后，受试者重新调整为直立位。另外10名受试者还接受了其他体位变化的检查（实验2）：在主相停止后，受试者重新调整为侧卧位、灌洗耳向上位和灌洗耳向下位。作为对照研究，对6名受试者未进行体位变化检查（实验3）。在37只（84%）耳朵中，在直立位观察到冷热试验性眼震。此外，在灌洗耳向上位的20只耳朵中的12只（60%）以及灌洗耳向下位的20只耳朵中的13只（65%）观察到冷热试验性眼震的水平成分。未进行体位变化时，未观察到冷热试验性眼震。这些发现表明冷热试验性眼震通过适应性过程发生改变，且与体位变化相关的冷热试验性眼震可能主要归因于前庭适应。
