Livingstone E F, DeLisa J A, Halar E M
Arch Phys Med Rehabil. 1984 Nov;65(11):726-30.
Mid-humerus cadaver determinations of ulnar F-wave, C7 spinal somatosensory evoked potential (SEP), and modified C8 root stimulation (RS) were performed bilaterally on 20 normal subjects to standardize technique and obtain normal values for the segment from mid-humerus to cervical spine. Our cadaver study shows that the best position for upper extremity measurement of mid-humerus-cervical spine distance is at 60 degrees of shoulder abduction, 45 degrees of internal rotation, and at the distance of 35cm, measured by caliper. Using this position and distance the following normal values were obtained: 1) Mid-humerus F-wave minimal, maximal, and mean latencies, and minimal nerve conduction velocity (NCV) were 21.8 +/- 1.2msec, 22.3 +/- 1.2msec, 22.3 +/- 1.1msec, and 59.7 +/- 2.4m/sec, respectively. Latency difference between minimal and maximal F-wave was 1.4 +/- 0.4msec. 2) Cervical spine SEP was 5.1 +/- 0.4msec, with left to right difference of less than 0.9msec. 3) C8 RS and mid-humerus ulnar nerve (UN) pick-up latency and NCV were 4.9 +/- 0.2msec and 71.4 +/- 2.2m/sec, whereas C8 root pick-up and mid-humerus UN stimulation latency and NCV were 5.2 +/- 0.4msec and 66.9 +/- 5.2m/sec, respectively. To evaluate proximal nerve conductivity through the thoracic outlet, the sequential use of the three modified techniques for 35cm mid-humerus-cervical spine distance is recommended.
对20名正常受试者的双侧肱骨中段进行尺神经F波、C7脊髓体感诱发电位（SEP）和改良C8神经根刺激（RS）测定，以规范技术并获取从中段肱骨到颈椎节段的正常值。我们的尸体研究表明，上肢测量肱骨中段至颈椎距离的最佳位置是肩部外展60度、内旋45度，并用卡尺测量距离为35厘米处。采用此位置和距离，获得了以下正常值：1）肱骨中段F波最小、最大和平均潜伏期，以及最小神经传导速度（NCV）分别为21.8±1.2毫秒、22.3±1.2毫秒、22.3±1.1毫秒和59.7±2.4米/秒。最小和最大F波之间的潜伏期差异为1.4±0.4毫秒。2）颈椎SEP为5.1±0.4毫秒，左右差异小于0.9毫秒。3）C8 RS和肱骨中段尺神经（UN）采集潜伏期和NCV分别为4.9±0.2毫秒和71.4±2.2米/秒，而C8神经根采集和肱骨中段UN刺激潜伏期和NCV分别为5.2±0.4毫秒和66.9±5.2米/秒。为评估通过胸廓出口的近端神经传导性，建议在肱骨中段至颈椎距离为35厘米时依次使用三种改良技术。
