Katsarkas A
Department of Otolaryngology, Royal Victoria Hospital, Montreal, Quebec, Canada.
Acta Otolaryngol. 1991;111(2):193-200. doi: 10.3109/00016489109137374.
In 285 patients, the observed nystagmus during episodes of PPV was compatible with excitation of the posterior semicircular canal. In these cases, divided in two groups, routine ENG recordings were retrospectively reviewed. In Group A (n = 241), the ENG was performed during the time the vertigo could be elicited; in Group B (n = 44), during the time it could not. In Group A: 1) the velocity of positional nystagmus (not the paroxysmal) was less than 6 degrees/s in 93% of cases; 2) there was no statistical difference of positional nystagmus and post-caloric preponderance of opposite directions, with 66% of cases having symmetrical responses; 3) the velocity of positional nystagmus and the post-caloric preponderance were higher than in Group B. It is concluded that: (i) in most cases no concomitant vestibular dysfunction could be detected; (ii) there was a tendency to restore right-left asymmetricity when the episodes subsided; (iii) ENG recordings were not pathognomonic and did not localize the affected side; (iv) there were ENG findings suggestive of concomitant involvement of other vestibular sensors (canals), in a small number of cases.
在285例患者中，观察到的PPV发作期间的眼球震颤与后半规管兴奋相符。在这些病例中，分为两组，对常规ENG记录进行回顾性分析。A组（n = 241），在能诱发眩晕时进行ENG检查；B组（n = 44），在不能诱发眩晕时进行检查。A组：1）93%的病例中位置性眼球震颤（非阵发性）速度小于6度/秒；2）位置性眼球震颤和冷热试验后向对侧优势无统计学差异，66%的病例反应对称；3）位置性眼球震颤速度和冷热试验后优势高于B组。结论如下：（i）大多数情况下未检测到伴随的前庭功能障碍；（ii）发作缓解时有恢复左右不对称的趋势；（iii）ENG记录不具有特征性，也不能定位患侧；（iv）少数病例中有ENG结果提示其他前庭感受器（半规管）同时受累。
