[Developmental study of somatosensory evoked potentials in the median nerve in children].
By evaluation of the findings in 134 healthy children aged one month to 14 years the authors obtained normal values of SEP of the median nerve and investigated developmental changes which involved among others an increased rate of conduction along the fibres of the peripheral neuron and changes of the distance between electrodes. From the findings ensued that the conduction velocity in mixed fibres of the median nerve in the portion wrist- Erb's point increased most in children aged 2-4 years where it increased to as much as 10 ms-1, while at the age of 1 month to 2 years the increase was 6 ms-1. This difference can be explained by a different maturity of fibres transmitting the impulses. The great scatter in the youngest children confirmed this view. The latency of the cortical response (N 18) in the youngest children was longest and declined gradually. At the age of 2-4 years it was even lower than in older children which may be explained by a more rapid transmission of the impulse in this age group than was the increment of distances between electrodes. Later, on the other hand, the growth of the extremities was more manifested. The above changes were less apparent in latencies of the spinal wave (N 13) and in values of the central conduction time where some part may have been played also by the relative maturity of structures of the brain stem.
Lehovský
M
M
Dĕtská neurologická klinika FN Motol.
Hotová
Z
Z
Kraus
J
J
D000293:Adolescent; D000375:Aging / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D005073:Evoked Potentials, Somatosensory; D006801:Humans; D007223:Infant; D008475:Median Nerve / Q000502:physiology*; D011930:Reaction Time
Vývojová studie SEP n. medianus u dĕtí.