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Titolo:
Somatosensory evoked magnetic fields from the primary somatosensory cortex(SI) in acute stroke
Autore:
Wikstrom, H; Roine, RO; Salonen, O; Lund, KB; Salli, E; Ilmoniemi, RJ; Aronen, HJ; Huttunen, J;
Indirizzi:
Univ Helsinki, Cent Hosp, Med Engn Ctr, BioMag Lab, Helsinki, Finland UnivHelsinki Helsinki Finland Engn Ctr, BioMag Lab, Helsinki, Finland Univ Helsinki, Cent Hosp, Dept Clin Neurosci, Helsinki, Finland Univ Helsinki Helsinki Finland p, Dept Clin Neurosci, Helsinki, Finland Univ Helsinki, Cent Hosp, Dept Radiol, Helsinki, Finland Univ Helsinki Helsinki Finland ent Hosp, Dept Radiol, Helsinki, Finland Kuopio Univ Hosp, Dept Clin Radiol, SF-70210 Kuopio, Finland Kuopio Univ Hosp Kuopio Finland SF-70210 adiol, SF-70210 Kuopio, Finland
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 5, volume: 110, anno: 1999,
pagine: 916 - 923
SICI:
1388-2457(199905)110:5<916:SEMFFT>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAN NERVE-STIMULATION; NON-AFFECTED HEMISPHERE; FUNCTIONAL-ORGANIZATION; UNILATERAL LESIONS; CEREBRAL-LESIONS; POTENTIALS; RESPONSES; REORGANIZATION; LOCALIZATION; DISEASE;
Keywords:
evoked magnetic fields; somatosensory evoked magnetic field; somatosensory cortex; stroke;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Wikstrom, H Univ Helsinki, Cent Hosp, Med Engn Ctr, BioMag Lab, Helsinki, Finland Univ Helsinki Helsinki Finland ioMag Lab, Helsinki, Finland
Citazione:
H. Wikstrom et al., "Somatosensory evoked magnetic fields from the primary somatosensory cortex(SI) in acute stroke", CLIN NEU, 110(5), 1999, pp. 916-923

Abstract

We recorded somatosensory evoked magnetic fields (SEFs) to median nerve stimulation from 15 patients in the acute stage (1-15 days from the onset of the symptoms) of their first-ever unilateral stroke involving sensorimotor cortical and/or subcortical structures in the territory of the middle cerebral artery (MCA). Neuronal activity corresponding to the peaks of the N20m,P35m and P60m SEF deflections from the contralateral primary somatosensorycortex (SI) was modelled with equivalent current dipoles (ECDs), the locations and strengths of which were compared with those of an age-matched normal population. Four patients with pure motor stroke had symmetric SEFs. In one of the 4 patients with pure sensory stroke, and in 5 of the 7 patients with sensorimotor paresis, the SEFs were markedly attenuated or missing. All except one patient with abnormal SEFs had deficient two-point discrimination ability; especially the attenuation of N20m was more clearly correlatedwith two-point discrimination than with joint-position or vibration senses. Of the different SEF deflections, P35m and P60m were slightly more sensitive indicators of abnormality than N20m, the former being affected in two patients with symmetric N20m. Three patients with pure sensory stroke and lesions in the opercular cortex had normal SEFs from SI. We conclude that theSEF deflections N20m, P35m and P60m from SI are related to cutaneous sensation, in particular discriminative to touch. The results also demonstrate that basic somatosensory perception can be affected by lesions in the opercular cortex in patients with functionally intact SI. (C) 1999 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 26/01/20 alle ore 16:08:54