Pain-related somatosensory evoked potentials following CO2 laser stimulation of foot in man |
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| Institution: | 1. Department of Brain Pathophysiology, Kyoto University Faculty of Medicine, Shogoin, Sakyo-ku, Kyoto 606 Japan;2. Department of Anesthesiology, Kyoto University Faculty of Medicine, Shogoin, Sakyo-ku, Kyoto 606 Japan;3. Department of Neurology, Kyoto University Faculty of Medicine, Shogoin, Sakyo-ku, Kyoto 606 Japan;4. Department of Clinical Neuropsychology, National Hospital for Neurology and Neurosurgery, Queen Square, London UK;1. Department of Materials Science and Engineering, Graduate School of Green Energy Technology, Chungnam National University, Daejeon 34134, South Korea;2. Department of Anticounterfeit Center, Korea Minting, Security Printing & ID Card Operating Corp., Daejeon 34132, South Korea;3. Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, South Korea;1. George Washington School of Medicine and Health Sciences, 2300 Eye St, Washington, DC, 20037, USA;2. Stavros Niarchos Foundation Complex Joint Reconstruction Center, Hospital for Special Surgery, 535 E 70th St, New York, NY, 10021, USA;3. Department of Orthopedic Surgery, George Washington University, 2300 M St NW, Washington DC, 20037, USA;4. Adult Reconstruction and Joint Replacement, Hospital for Special Surgery, 535 E 70th St, New York, NY, 10021, USA;1. Department of Orthopaedic Surgery, Juntendo University Shizuoka Hospital, Japan;2. Department of Orthopaedic Surgery, Juntendo University, Japan |
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| Abstract: | Since our previous study of pain somatosensory evoked potentials (SEPs) following CO2 laser stimulation of the hand dorsum could not clarify whether the early cortical component NI was generated from the primary somatosensory cortex (SI) or the secondary somatosensory cortex (SII) or both, the scalp topography of SEPs following CO2 laser stimulation of the foot dorsum was studied in 10 normal subjects and was compared with that of the hand pain SEPs and the conventional SEPs following electrical stimulation of the posterior tibial nerve recorded in 8 and 6 of the 10 subjects, respectively. Three components (N1, N2 and P2) were recorded for both foot and hand pain SEPs. N1 of the foot pain SEPs was maximal at the midline electrodes (Cz or CPz) in all data where that potential was recognized, but the potential field distribution was variable among subjects and even between two sides within the same subject. N1 of the hand pain SEPs was maximal at the contralateral central or midtemporal electrode. The scalp distribution of N2 and P2, however, was not different between the foot and hand pain SEPs. The mean peak latency of N1 following stimulation of foot and hand was found to be 191 msec and 150 msec, respectively, but there was no significant difference in the interpeak latency of Nl-N2 between foot and hand stimulation. It is therefore concluded that NI of the foot pain SEPs is generated mainly from the foot area of SI. The variable scalp distribution of the N7 component of the foot pain SEPs is likely due to an anatomical variability among subjects and even between sides. |
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