Motor responses in transcranial magnetic stimulation and somatosensory evoked potentials in patients with pain syndromes
Gimranov, R.F.; Shchekut'ev, G.A.; Shabalov, V.A.; Kolyvanov, M.V.
Zhurnal Voprosy Neirokhirurgii Imeni N. N. Burdenko 4: 19-22
2001
ISSN/ISBN: 0042-8817 PMID: 11878212 Document Number: 538622
The main goal was to evaluate the motor and somatosensory systems by recording evoked motor responses (EMRs) during transcranial magnetic stimulation (TMS) and somatosensory evoked potentials (SEPs) in patients with neurogenic pain syndromes before and after implantation of the systems for chronic antipain epidural stimulation. Fifteen patients with neurogenic pain syndromes and a control group of 15 apparently healthy examinees were examined. The patients were found to have a significant reduction in the motor thresholds of EMRs during TMS and an increase in the amplitude of EMRs after implantations of the systems. There were no significant changes in the amplitude-time characteristics of short SEPs as compared to the healthy examinees and after implantation of the systems. Analysis of the amplitude-time characteristics of long SEPs in these patients revealed a significant increase in the amplitude of the component P250 as compared to the normal values and its decrease after implantation of the systems.