[Somatosensory potentials evoked by stimulation of the median nerves recorded during the operation from the surface of the cerebral cortex in patients with temporal lobe epilepsy].
Somatosensory evoked potentials obtained by stimulation of the median nerve were analysed. The potentials were recorded from 237 points of exposed cortex in 34 patients with temporal lobe epilepsy with epileptogenic focus in the left lobe in 17 cases, and in the right lobe in 17 cases. Only N 20 and P 20 responses were analysed, considering potentials with amplitude above 0.3 uV. No response was obtained from 40.7% of points on the right side, and from 48.7% points on the left. On the right side negative potentials prevailed (56.8%) and on the left side positive potentials were more frequent (32.8%). A characteristic feature of the recorded potentials was their low amplitude and shorter latency of the positive deflection in which they differed from the potentials evoked from the primary sensorimotor cortical representation of the hand. The authors put forward the hypothesis that the recorded potentials are generated by secondary sensory areas and sensory representation in the external cortex of the temporal lobes.
Szkiładź
E
E
Kliniki Neurochirurgii Instytutu Chirurgii AM, Warszawie.
Bacia
T
T
Bidziński
J
J
Checiński
S
S
Rakowicz
M
M
D000293:Adolescent; D000328:Adult; D001132:Arm / Q000294:innervation*; D004558:Electric Stimulation; D004833:Epilepsy, Temporal Lobe / Q000503:physiopathology* / Q000601:surgery; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D006801:Humans; D007432:Intraoperative Period; D008297:Male; D008475:Median Nerve / Q000503:physiopathology*; D013003:Somatosensory Cortex / Q000503:physiopathology*
Somatosensoryczne potencjały wywołane draznieniem nerwów pośrodkowych rejestrowane śródoperacyjnie z powierzchni kory mózgowej u chorych z padaczka skroniowa.