[Somatosensory cortical stimulus response evoked potentials in unilateral symptoms caused by cerebrovascular disorders or brain tumors].

Comparative investigations of somatosensory evoked potentials in 23 patients with hemisyndromes following acute ischemia of the middle cerebral artery region and in 12 patients with similar hemisyndromes on the base of cerebral neoplasms revealed marked differences. Whereas in 87% of the patients with ischemic lesions the primary cortical complex of the SEP was severely altered there were similar abnormalities in only one of the patients with neoplasm. The SEP changes were not dependent on the neurologic (sensory) symptoms nor on focal or diffuse EEG abnormalities.