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[Developmental study of somatosensory evoked potentials in the median nerve in children]
M Lehovský1, Z Hotová, J Kraus
1Dĕtská neurologická klinika FN Motol.
Insights
This study establishes normal median nerve sensory nerve conduction values in children. Conduction velocity and cortical response latency change significantly with age, reflecting nerve fiber maturation and body growth.
Area of Science:
- Neuroscience
- Developmental Biology
- Pediatric Neurology
Context:
- Nerve conduction studies are crucial for diagnosing pediatric neurological disorders.
- Understanding normal developmental changes in nerve conduction is essential for accurate interpretation.
- Previous research has not comprehensively detailed age-related normative values for median nerve SEP in children.
Purpose:
- To establish normative values for sensory evoked potentials (SEP) of the median nerve in healthy children aged one month to 14 years.
- To investigate developmental changes in peripheral nerve conduction velocity and cortical response latency.
- To correlate these changes with neuronal fiber maturity and physical growth.
Summary:
- Conduction velocity in the median nerve (wrist to Erb's point) showed the most significant increase (10 ms-1) in children aged 2-4 years, compared to a 6 ms-1 increase in those aged 1 month to 2 years.
- Cortical response latency (N18) was longest in the youngest children and gradually decreased, being shortest in the 2-4 year age group, suggesting faster impulse transmission relative to electrode distance changes.
- Spinal wave latency (N13) and central conduction time showed less pronounced changes, potentially influenced by brainstem structure maturity.
Impact:
- Provides essential normative data for pediatricians and neurologists evaluating nerve function in children.
- Enhances the diagnostic accuracy of neurophysiological tests in pediatric populations.
- Contributes to the understanding of neurodevelopmental processes in early childhood.
Abstract:
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.