Mapping of tibial nerve evoked magnetic fields over the lower spine |
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| Affiliation: | 1. Neurophysics Group, Department of Neurology, Universitätsklinikum Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, 12200 Berlin, Germany;2. Physikalisch-Technische Bundesanstalt, Berlin, Germany;1. Instituto de Fisiologia, Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal;2. Department of Neurology, Hospital de Egas Moniz, Centro Hospitalar de Lisboa Ocidental, Lisbon, Portugal;3. Department of Neurology, Hospital Garcia de Orta, Almada, Portugal;4. Department of Neurosciences, Hospital de Santa Maria, Centro Hospitalar de Lisboa Norte, Lisbon, Portugal;1. VA Boston HealthCare System, 150 South Huntington Avenue, Boston, MA 02130, USA;2. Department of Neurology, Boston University School of Medicine, 72 East Concord Street, B-7800, Boston, MA 02118, USA;3. Chronic Traumatic Encephalopathy Program, Boston University School of Medicine, 72 East Concord Street, B-7800, Boston, MA 02118, USA;4. Department of Pathology, Boston University School of Medicine, 72 East Concord Street, B-7800, Boston, MA 02118, USA;5. Bedford Veterans Affairs Medical Center, 200 Springs Road, Building 18, Room 118, Bedford, MA 01730, USA;1. Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 chemin SteFoy, Université Laval, Québec G1V4G5, Canada;2. Department of Community Medicine and Rehabilitation, Section of Physiotherapy. Umeå University, Umeå, Sweden;3. ELEGI and COLT Laboratories, Queen''s Medical Research Institute, The University of Edinburgh, 47 Little France Crescent, Edinburgh EH16 4TJ, UK;4. Department of Respiratory Medicine, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh EH 16 4SA, UK;1. Aarhus University, Dept. of Food Science, Kirstinebjergvej 10, 5792 Årslev, Denmark;2. Department of Horticultural Engineering, Leibniz Institute for Agricultural Engineering, Potsdam, Germany |
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| Abstract: | Using a low-noise 49-channel dc-SQUID system spinal somatosensory evoked fields (SEF) were recorded which were generated by compound action currents evoked upon posterior tibial nerve stimulation. The SEF mapping showed the action current propagation along the sciatic nerve, lumbosacral plexus and cauda equina in parallel to simultaneously recorded electrical potentials (SEP). For a reliable intraindividual side-to-side comparison of spinal SEFs the right and left tibial nerves were stimulated in alternating order; this procedure minimizes artifactual inter-nerve SEF map differences due to eventual patient-to-sensor displacements which might occur in serial measurements. These large-area lumbar SEF mappings open up several clinical perspectives for magnetoneurography, in particular with respect to the 3D-localization of proximal conduction blocks. |
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