Responses to Median and Tibial Nerve Stimulation in Patients with Chronic Neuropathic Pain |
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| Authors: | Peter J Theuvenet Zbigniew Dunajski Maria J Peters Jan M van Ree |
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| Institution: | (1) Department of Anesthesiology, Medical Centre of Alkmaar, The Netherlands;(2) Institute of Biomedical Engineering, Warsaw University of Technology, Warsaw, Poland;(3) Low Temperature Division, Faculty of Physics, University of Twente, The Netherlands;(4) Rudolf Magnus Institute for Neuro Sciences, Utrecht University, Utrecht, The Netherlands |
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| Abstract: | Somatosensory evoked magnetic fields and electrical potentials were measured in eight patients with unilateral neuropathic pain. After median nerve stimulation on the painful side, the amplitudes of the evoked responses were enhanced 2 to 3 times at a latency of about 100 ms compared to the responses of the contralateral, unaffected side. After posterior tibial nerve stimulation an enhancement was found at latencies around 110 ms and 150 ms. The scalp distribution of the magnetic field at the latencies of  abnormal responses was dipolar and the responses could be ascribed to a current dipole. Three (of the eight) patients underwent spinal cord stimulation (SCS) for their pain. The enhancement of the evoked responses to stimulation of the painful side decreased after spinal cord stimulation. After a long period of spinal cord stimulation only (e.g., a year) during which the patient reported to be pain free, these abnormal responses were no longer observed. |
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| Keywords: | Pain Evoked fields Evoked potentials Spinal cord stimulation Electroencephalography Magnetoencephalography Neuromagnetism |
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