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Fourteen patients with severe bilateral carotid artery stenosis underwent carotid endarterectomy. Intra-operative ischemia was monitored by somatosensory evoked potentials (SSEP) bilaterally. Neuropsychological evaluations were completed within two days before operation and 4-9 days after operation. Complete loss of N1-P1 or P1-N2 components of the SSEP(More)
Detailed neuropsychological assessments were performed before and shortly after carotid endarterectomy in thirty-four patients. The degree of intraoperative ischemia was assessed by monitoring the somatosensory evoked cortical potential change upon carotid clamping. Changed neuropsychological performance was found to be related to intraoperative ischemia(More)
Twelve patients with multiple occlusive neck vessel lesions were thought to possess low flow-endangered brains. These patients were studied before and after carotid reconstruction with a battery of neuropsychologic tests emphasizing memory and mental agility. A closely matched control group was selected from patients undergoing endarterectomy for(More)
Of four patients having Angelman's syndrome admitted to a state mental facility who were clinically and electroencephalographically evaluated, 2 patients had CT scan studies of the brain. The most impressive and striking features that help in the diagnosis are the mental and physical retardation, nondevelopment of speech despite adequate visual and auditory(More)
Scalp recorded somatosensory evoked cortical responses (SSEP) may be measured under general anesthesia to assess the electrical responsiveness of the brain. Such potentials were measured in 25 patients undergoing carotid endarterectomy without shunt. Electrical unresponsiveness occurred bilaterally in one patient and unilaterally in one patient. The patient(More)
An 8-year-old child developed acute mental confusion, and choreoathetosis without a preceding history of acute rheumatic fever. Serial EEGs showed focal suppression of sleep spindle activity over the right cerebral hemisphere along with high-amplitude polymorphic slow-wave complexes. CT scan studies on 4 occasions and MRI scan failed to show focal lesions(More)
We believe that somatosensory and brainstem auditory evoked response studies help in the understanding of the dysfunction of the ascending sensory pathyways at various levels. In some patients where EEGs showed a significant contamination of muscle and background noise, the SEP studies helped to identify the level of dysfunction. The severity of the(More)
We analyzed 320 electroencephalograms done on 60 patients having tuberous sclerosis. The main features in EEGs were diffuse slowing in the background activity, slow spike-wave discharges, focal and multifocal spike discharges, and amplitude asymmetries. No significant changes occurred in EEGs during the follow-up. No characteristic pattern was identified(More)