Dvorák J, Herdmann J, Theiler R
Department of Neurology, Spine Unit, Wilhelm Schulthess Hospital, Zürich, Switzerland.
Spine (Phila Pa 1976). 1990 Mar;15(3):155-60.
Painless transcranial magnetic stimulation has been performed on 53 healthy adults in order to obtain normal values of central motor pathway conduction times to cervical segments innervating upper limb muscles. Central motor latency was 5.1 msec when recording from the biceps brachii and 5.2 msec when recording from the abductor pollicis brevis or abductor digiti minimi muscles. The plexus motor latency as the conduction time between the cervical motor root and the proximal nerve trunks in the axillary region was 2.2 msec and 2.6 msec when recorded from the abductor pollicis brevis and abductor digiti minimi muscles, respectively. Conduction times higher than mean latency + 2 standard deviation may indicate a pathologic conduction slowing. Magnetic stimulation of the motor system is a new painless neurophysiologic technique enabling examination of the central motor pathways in awake subjects. With respect to spinal cord diagnostics, this method is useful in conditions such as compression of the spinal cord or of the motor root in the intervertebral foramen or canal.
为了获得支配上肢肌肉的颈段中枢运动通路传导时间的正常值，对53名健康成年人进行了无痛经颅磁刺激。从肱二头肌记录时，中枢运动潜伏期为5.1毫秒；从拇短展肌或小指展肌记录时，中枢运动潜伏期为5.2毫秒。丛运动潜伏期（即颈运动神经根与腋窝区域近端神经干之间的传导时间），从拇短展肌记录时为2.2毫秒，从小指展肌记录时为2.6毫秒。传导时间高于平均潜伏期加2个标准差可能表明存在病理性传导减慢。运动系统的磁刺激是一种新的无痛神经生理技术，能够在清醒受试者中检查中枢运动通路。就脊髓诊断而言，该方法在诸如脊髓受压或椎间孔或椎管内运动神经根受压等情况下很有用。
