Bischoff C, Liscic R, Meyer B U, Machetanz J, Conrad B
Neurologische Klinik und Poliklinik, Technischen Universität München, Federal Republic of Germany.
Electromyogr Clin Neurophysiol. 1993 Jul-Aug;33(5):265-9.
Magnetically and electrically elicited blink reflexes were studied in 11 normal subjects and in 5 patients with partial peripheral facial nerve palsy. Both methods were able to elicit a reproducible blink reflex. In both groups the latencies of the magnetically elicited reflexes were equal to those that followed electrical stimulation. The magnetic stimulation technique offered 2 advantages over the electrical stimulation: (1) it was less painful and therefore better tolerated and (2) the coil position in the middle of the forehead was sufficient to elicit a bilateral blink reflex because the windings of the stimulation coil excited both supraorbital nerves simultaneously. This bilateral response enables one to reduce the number of stimuli and can be used in the examination of patients that have peripheral facial nerve palsies without the concomitant impairment of the reflex pathway in the brainstem. The magnetic technique can also elicit a blink reflex at stimulation points distant from the supraorbital notch. This finding offers an alternative explanation of the late responses of facial muscles following transcranial magnetic stimulation of the motor cortex.
对11名正常受试者和5名部分周围性面神经麻痹患者进行了磁刺激和电刺激诱发眨眼反射的研究。两种方法均能引出可重复的眨眼反射。两组中磁刺激诱发反射的潜伏期与电刺激后的潜伏期相等。磁刺激技术相对于电刺激具有两个优点：（1）疼痛较轻，因此耐受性更好；（2）前额中部的线圈位置足以引出双侧眨眼反射，因为刺激线圈的绕组同时刺激了双侧眶上神经。这种双侧反应能够减少刺激次数，可用于检查周围性面神经麻痹患者，而不会同时损害脑干中的反射通路。磁刺激技术还能在远离眶上切迹的刺激点引出眨眼反射。这一发现为经颅磁刺激运动皮层后面部肌肉的迟发反应提供了另一种解释。
