Somatosensory evoked potentials in patients with occlusions of cerebral arteries.
The material consists of 100 patients suffering from occlusion of a cerebral artery, admitted for the performance of arterial bypass. Before the operation SEPs of the median nerve and CT scans were taken. Three main types of SEP were found (symmetric, asymmetric-attenuated, asymmetric-augmented) and pathological changes of latency, amplitude and wave form of the primary complex N1-P2 were described. The changes were correlated with the localization and extent of the hypodense lesion in the cerebral hemispheres. The cause of the decreased latencies on the side of the lesion is discussed and reported in relation to 'travelling waves' (Cracco 1980) in normals. The cause of the increased amplitude on the side of the lesion is also discussed and reported in relation to a disturbance of the suppressor cortex 8s, 19s and of the head of the caudate nucleus.
L
L
Stejskal
J
J
Sobota
D000328:Adult; D001157:Arterial Occlusive Diseases / Q000503:physiopathology*; D002536:Cerebral Arteries; D002561:Cerebrovascular Disorders / Q000503:physiopathology; D004569:Electroencephalography; D005073:Evoked Potentials, Somatosensory; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged