眼震电图检查儿童先天性眼震的意义

目的：探讨眼震电图对先天性眼震患者手术效果的评定及其临床意义。方法：对42例儿童先天性眼震患者行手术前后眼震电图检测,中间位检查方法为令患者头正位注视正前方50cm处与双眼平行的目标光点;代偿位检查时令患者放松以平时视物最佳位为准,在此位患者眼震最小。观察中间位和代偿位眼震的速度、幅度和频率。眼震幅度、频率和速度计算均取最大眼震反应期10s时期内的平均值。结果：眼震电图可以记录到跳动型和钟摆型两种不同的眼震波,跳动型呈锯齿波,钟摆型呈正弦波。手术后中心位和代偿位的眼震与术前相比有明显降低。42例患者的眼震速度在中心位和代偿位有不同程度的下降或消失,占88.09%,42例患者中眼震幅度下降者35例,占83.3%（P〈0.01）。术后眼震频率在中心位和代偿位也均有下降,但以中心位明显,其中16例患者代偿位眼震的频率、幅度和速度降为零。结论：眼震电图检查可以作为儿童先天性眼震的量化标准来指导手术,评价手术治疗效果。

Detection and assessment of electronystagmography on children with congenital nystagmus

Objective To assess the therapeutic effects of electronystagmography(ENG) in surgical treatment on congenital nystagmus(CN) as well as investigate its clinical significance. Methods Forty-two children with CN were included as surveyed targets and ENG was performed to each patient. The medium position examination was to ask the patients to fix their eyes at the objective spot which is 50 cm in front and paralleled to the eyes. Substitutional position examination was designed to make the patients relax and look at the spots optimally as usual and in this case, the nystagmus of the patients was the minimal. The velocity, amplitude and frequency of nystagmus in the medium and substitutional positions were observed, and their average values within the maximal hystagmus response period of 10s were calculated. Results ENG recorded two kinds of nystagmus waveforms: subsultus waveform as saw tooth wave, and pendulum waveform as sinusoidal wave. The postoperative velocity, amplitude and frequency of nystagmus were significantly decreased in the medium and substitutional positions, compared with that of the three factors in preoperative periods. The velocity of nystagmus in the medium and substitutional positions was decreased or even vanished postoperatively in 88.09% (37/42) cases. The amplitude of nystagmus was decreased postoperatively in 83.3% (35/42) cases. The frequency of nystagmus was significantly decreased in the medium position postoperatively (P<0.01). The disappearances of velocity, amplitude and frequency in the substiltutional position postoperatively were observed in 38.09% (16/42) cases. Conclusion These results may suggest that ENG could be used as an objective quantification method for the evaluation of the surgical intervention's therapeutic effects on children with CN.