Evangelopoulos Maria E, Humpert Sebastian, Rösler Kai M
*Department of Neurology, Eginition Hospital, National and Kapodistrian University of Athens, Athens, Greece; and †Department of Neurology, Inselspital, University of Bern, Bern, Switzerland.
J Clin Neurophysiol. 2017 May;34(3):243-247. doi: 10.1097/WNP.0000000000000361.
Saphenous nerve conduction studies are difficult, because the nerve is hard to localize and evoked responses are small. Ultrasound imaging may assist in the accurate localization and optimal positioning of surface (SE) and needle electrodes (NE).
The study population included 39 subjects and was divided into two groups. Group A consisted of 20 healthy subjects, whereas group B of 19 patients with polyneuropathies. Orthodromic conduction was measured by distal supramaximal nerve stimulation. Surface electrode and NE recordings were compared.
In the control group, SEs recorded responses in 17 of 20 healthy subjects, whereas NEs in 19. In the patients' group, SEs recorded responses in 7 of 19 patients, whereas NEs in 16. In all healthy subjects and patients, sensory nerve action potentials recorded by NEs were significantly larger than those obtained by SEs (healthy subjects: 5.85 ± 3.01 μV vs. 1.98 ± 1.37 μV, P < 0.0001; patients 3.05 ± 2.35 μV vs. 0.71 ± 1.14 μV, t-test P < 0.0001).
Ultrasound guidance allows precise electrode positioning for saphenous nerve electrophysiological testing. Amplitudes of the recorded sensory nerve action potentials are clearly higher with ultrasound-guided needle than with surface recordings.
隐神经传导研究具有挑战性，因为该神经难以定位且诱发反应较小。超声成像可能有助于表面电极（SE）和针电极（NE）的准确定位和最佳放置。
研究人群包括39名受试者，分为两组。A组由20名健康受试者组成，而B组由19名患有多发性神经病的患者组成。通过远端超强神经刺激测量顺向传导。比较表面电极和针电极记录。
在对照组中，20名健康受试者中有17名通过表面电极记录到反应，而通过针电极记录到反应的有19名。在患者组中，19名患者中有7名通过表面电极记录到反应，而通过针电极记录到反应的有16名。在所有健康受试者和患者中，针电极记录的感觉神经动作电位明显大于表面电极记录的（健康受试者：5.85±3.01μV对1.98±1.37μV，P<0.0001；患者：3.05±2.35μV对0.71±1.14μV，t检验P<0.0001）。
超声引导可为隐神经电生理测试实现精确的电极放置。超声引导下针电极记录的感觉神经动作电位幅度明显高于表面记录。
