Saito S, Møller A R, Jannetta P J, Jho H D
Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pennsylvania.
Acta Neurochir (Wien). 1993;124(2-4):92-8. doi: 10.1007/BF01401129.
Electromyographic (EMG) recordings from patients undergoing microvascular decompression (MVD) operations to relieve spasmodic torticollis were studied. When EMG potentials were recorded from the sternocleidomastoid muscle in response to electrical stimulation of the spinal accessory nerve (SAN) at the neck, an abnormal (delayed) response was seen in 9 of 12 patients who had unilateral symptoms. In 5 patients with bilateral symptoms, no such delayed response was seen. We assume that this abnormal muscle response depends on an abnormal cross-transmission. Neural conduction time measurements, using electrical stimulation of the intracranial portion of the SAN, indicated that the location of this cross-transmission was more central than the vascular compression of the SAN. We hypothesize that this location might be in the motonucleus of the SAN. Similarities between these abnormal EMG findings in patients with spasmodic torticollis and those reported earlier in patients with hemifacial spasm (HFS) are presented.
对接受微血管减压术（MVD）以缓解痉挛性斜颈的患者进行了肌电图（EMG）记录研究。当在颈部对副神经（SAN）进行电刺激时，从胸锁乳突肌记录EMG电位，12例单侧症状患者中有9例出现异常（延迟）反应。5例双侧症状患者未出现这种延迟反应。我们假设这种异常肌肉反应取决于异常的交叉传导。通过对SAN颅内部分进行电刺激来测量神经传导时间，结果表明这种交叉传导的位置比SAN的血管压迫更靠近中枢。我们推测该位置可能在SAN的运动核中。本文呈现了痉挛性斜颈患者这些异常EMG表现与早期报道的面肌痉挛（HFS）患者异常EMG表现之间的相似性。
