Golež Ana, Rodi Zoran
Institute of Clinical Neurophysiology, University Medical Centre Ljubljana, Ljubljana, Slovenia.
J Clin Neurophysiol. 2015 Dec;32(6):501-4. doi: 10.1097/WNP.0000000000000213.
To record responses in the abductor hallucis muscle after lumbosacral stimulation with a figure-of-eight magnetic coil. To compare magnetic stimulation (MS), electrical stimulation (ES), and the peripheral motor conduction time.
M and F waves and compound muscle action potentials were recorded after L1 MS, S1 MS, and L1 ES.
The compound muscle action potential latency on L1 MS was 26.9 ± 2.6 milliseconds and on L1 ES was 25.6 ± 2.2 milliseconds, and the peripheral motor conduction time was 27.0 ± 2.5 milliseconds (analysis of variance P = 0.0008). The compound muscle action potential amplitude was 12 ± 11% of M-wave on L1 MS, 32 ± 18% on S1 MS, and 31 ± 17% on L1 ES.
Dorsal MS reliably elicits responses in the abductor hallucis muscle. The latency of compound muscle action potentials on L1 MS is comparable to peripheral motor conduction time. A potential drawback of MS may be too weak stimulation at the proximal end of the cauda equina.
记录使用8字形磁线圈进行腰骶部刺激后拇展肌的反应。比较磁刺激（MS）、电刺激（ES）以及外周运动传导时间。
在L1磁刺激、S1磁刺激和L1电刺激后记录M波和F波以及复合肌肉动作电位。
L1磁刺激时复合肌肉动作电位潜伏期为26.9±2.6毫秒，L1电刺激时为25.6±2.2毫秒，外周运动传导时间为27.0±2.5毫秒（方差分析P=0.0008）。L1磁刺激时复合肌肉动作电位幅度为M波的12±11%，S1磁刺激时为32±18%，L1电刺激时为31±17%。
背部磁刺激能可靠地诱发拇展肌的反应。L1磁刺激时复合肌肉动作电位的潜伏期与外周运动传导时间相当。磁刺激的一个潜在缺点可能是在马尾近端刺激较弱。
