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[Conduction velocity in peripheral nerves in healthy and sick children]
Insights
Nerve conduction velocity in children reaches adult levels by age 5. Spinal muscular atrophy may present with delayed myelination, indicated by reduced conduction velocity in young children.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Clinical Electrophysiology
Context:
- Peripheral nerve conduction velocity (NCV) is a key indicator of nerve health and myelination.
- Establishing normative NCV data in pediatric populations is crucial for diagnosing neurological disorders.
- Developmental changes in myelination significantly impact NCV during childhood.
Purpose:
- To establish normative data for motor nerve conduction velocity (NCV) in healthy children.
- To compare NCV in children with specific neurological conditions to healthy controls.
- To investigate the relationship between NCV and myelination in pediatric neurological disorders.
Summary:
- Motor nerve conduction velocity (NCV) was assessed in healthy children (4 months to 15 years) and those with spinal muscular atrophy (SMA), untreated phenylketonuria (PKU), myopathies, and infantile cerebral palsy.
- Adult-level NCV in the ulnar and peroneal nerves was achieved around age 3, and in the median nerve by age 4-5.
- NCV was generally normal in children with untreated PKU, myopathies, and infantile cerebral palsy, but reduced NCV in young SMA patients suggested delayed myelination.
Impact:
- Provides normative pediatric NCV data for improved diagnostic accuracy.
- Highlights reduced NCV as a potential early indicator of delayed myelination in infantile spinal muscular atrophy.
- Supports the use of electrophysiological assessments in the early detection and management of pediatric neurological conditions.
Abstract:
Conduction velocity was determined in motor fibres of peripheral nerves in healthy children aged from 4 months to 15 years and in children with spinal muscular atrophy, untreated phenylketonuria, myopathies and infantile cerebral palsy. Conduction velocity equalling that in adults is reached in the ulnar and peroneal nerves at the age of about 3 years, in the median nerve somewhat later (at the age of 4-5 years). In cases of untreated phenylketonuria, myopathies and infantile cerebral palsy conduction velocity was about normal. In spinal muscular atrophy decreased conduction velocity in the youngest children may indicate delayed myelination of peripheral nerves.