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A Method of Diagnosis of the Functional State of Afferent Pathways of the Spinal Cord by Magnetic Stimulation

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Abstract

The authors suggest a method for quantitative diagnosis of the functional state of the afferent pathways of the spinal cord by magnetic stimulation in the projection of the vertebrae CVI–CVII and LIII–LIV. The induced motor response (IMR) was recorded from the orbicular muscle of the eye. The velocity of propagation of excitation (VPE) along the afferent pathways between the vertebrae CVI–CVII and LIII–LIV was measured as the ratio of the distance between two stimulation points (along the coil center) to the difference between the latent periods of the recorded IMRs. In healthy adults, VPE was 77.93 ± 4.93 m/s, and in healthy children, 7- to 14-years old, it was 77.60 ± 4.12 m/s. In patients with disseminated sclerosis, this index was 40.15 ± 14.81 m/s. The asymmetry value (AV) was 5.31 ± 1.20 m/s. The VPE and AV in patients with disseminated sclerosis differed significantly from those in healthy subjects of same sex and age (p < 0.05).

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Authors and Affiliations

  1. Altai State Medical University, Barnaul, Russia

    K. V. Smirnov, V. P. Kulikov, Yu. V. Smirnova & A. G. Remnev

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  1. K. V. Smirnov
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  2. V. P. Kulikov
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  3. Yu. V. Smirnova
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  4. A. G. Remnev
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Smirnov, K.V., Kulikov, V.P., Smirnova, Y.V. et al. A Method of Diagnosis of the Functional State of Afferent Pathways of the Spinal Cord by Magnetic Stimulation. Human Physiology 28, 417–419 (2002). https://doi.org/10.1023/A:1016525830610

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