Luk K D, Hu Y, Lu W W, Wong Y W
Department of Orthopaedic Surgery, Duchess of Kent Children's Hospital, The University of Hong Kong, 12 Sandy Bay Road, Hong Kong, China.
J Spinal Disord. 2001 Jun;14(3):247-51. doi: 10.1097/00002517-200106000-00010.
The effect of the stimulus duration on the amplitude and latency of intraoperative somatosensory evoked potential (SEP) was studied in 30 patients with idiopathic scoliosis undergoing surgery. Constant current square-wave electrical stimulation was applied to the posterior tibial nerve at a rate of 5.1 Hz. The effects of both the pulse duration and the stimulus current density on the intraoperative SEP were evaluated. Amplitudes and latencies of SEP were analyzed by one-way parametric analysis of variance. SEP signal recording was found to be difficult if the stimulus duration was less than 0.05 ms. The stimulus duration had no significant effect on the latencies of the SEP, but the amplitude of the SEP showed significant changes with differing stimulus durations. The SEP amplitudes were found with significant increases in pulse durations less than 0.3 ms. Stimulus pulse duration has a significant effect on SEP amplitude, and this should be taken into consideration during intraoperative SEP monitoring. A pulse duration of 0.3 ms is recommended for SEP using posterior tibial nerve stimulation.
对30例接受手术的特发性脊柱侧凸患者，研究了刺激持续时间对术中体感诱发电位（SEP）波幅和潜伏期的影响。以5.1Hz的频率对胫后神经施加恒流方波电刺激。评估了脉冲持续时间和刺激电流密度对术中SEP的影响。通过单向参数方差分析对SEP的波幅和潜伏期进行分析。发现如果刺激持续时间小于0.05ms，则SEP信号记录困难。刺激持续时间对SEP的潜伏期无显著影响，但SEP的波幅随刺激持续时间的不同而有显著变化。发现脉冲持续时间小于0.3ms时SEP波幅显著增加。刺激脉冲持续时间对SEP波幅有显著影响，术中SEP监测时应予以考虑。推荐在使用胫后神经刺激进行SEP检查时，脉冲持续时间为0.3ms。
