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CZECH MEDICAL ASSOCIATION J. Ev. PURKYNĚ |
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Česky / Czech version | Čes. a slov. Neurol. Neurochir., 68/101, 2005, No. 6, p. 368–372. |
Monophasic Positive Scalp Somatosensory Evoked
Potential Wave in Parietal Tumors Stejskal L.1, Tomáš R.2 1 Department of Neurosurgery, Charles University, 1st Faculty of Medicine, Central Military Hospital Prague 2 Department of Neurosurgery, Charles University, 3rd Faculty of Medicine, Faculty Hospital Královské Vinohrady Prague |
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Summary: We have selected a subgroup of 11 out of 168 patients with a pathological
lesion in or adjacent to the primary sensorimotor cortex assessed by
median nerve somatosensory evoked potentials (SEPs). In this subgroup
a simplification of waveform with predominant deep positivity was
recorded on the lesion side. Similar findings have been previously
reported in patients in deep coma. A mechanism similar to the “killed end
potential” and subcortical origin of deep positivity has been suggested.
Possible mechanisms generating a large positive potential in the terms of
volume conduction principles are discussed.
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