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[Motor nerve conduction velocity in children: normal values and application to a few pathologic cases]
Insights
Nerve conduction velocity (NCV) in children rapidly increases after birth, reaching adult values by age 5. These measurements are crucial for diagnosing pediatric neurological conditions and monitoring treatment effectiveness.
Area of Science:
- Pediatric Neurology
- Neurophysiology
- Developmental Neuroscience
Background:
- Nerve conduction velocity (NCV) is a key electrophysiological measure.
- Understanding age-related changes in NCV is essential for pediatric neurodiagnosis.
- Limited data exists on normative NCV values across early childhood.
Purpose of the Study:
- To establish age-specific reference values for various nerve conduction parameters in children.
- To compare motor and sensory NCV, as well as proximal and distal conduction.
- To assess the clinical utility of NCV in diagnosing pediatric neurological disorders.
Main Methods:
- Measured motor distal ulnar, motor distal tibial, proprioceptive tibial, proximal, VIIth superior branch, and XIIth cranial nerve conduction velocities.
- Included a cohort of children from birth to 15 years of age.
- Analyzed NCV data in relation to age and compared different nerve pathways.
Main Results:
- NCV was 45-50% of adult values in the first month, rapidly increasing to 90% within 18 months.
- Adult NCV values were attained between 2 and 5 years of age.
- Proprioceptive and proximal NCV were significantly higher than motor and distal NCV, respectively. Ulnar NCV exceeded tibial NCV.
Conclusions:
- NCV exhibits rapid maturation in early childhood, with distinct patterns for different nerve types.
- NCV measurements are valuable diagnostic tools for conditions like Krabbe's disease, metachromatic leukodystrophy, and toxic neuropathies.
- NCV aids in assessing nerve injury severity and monitoring patients undergoing chronic hemodialysis.
Abstract:
Nerve conduction velocity (NCV), according to age, was studied in normal children. Motor distal ulnar NCV (in 63 children, from 1 day to 4 years of age), motor distal tibial NCV (in 93 children, from birth to 15 years of age), proprioceptive tibial NCV (in 59 children, from birth to 5 years of age) and proximal CV (in 133 children from birth to 15 years of age), as well as VIIth superior branch CV (in 67 children) and XIIth CV (in 56 children) from birth to 3 years of age, were measured. These measurements showed that NCV changes were similar; NCV was 45-50% of the adult value during the first month of life. Then NCV increased very quickly, the progression being 90% of the first month's value during the first 18 months of life. The adult value was reached between 2 and 5 years of age. Proprioceptive NCV was 8-13 m/sec higher than motor NCV; proximal NCV was also 10-13 m/sec higher than distal motor tibial NCV. Ulnar NCV remained higher than tibial NCV, although changes in velocity as a function of age remained parallel. These NCV measurements proved significant in some diseases. The were useful for diagnosis of Krabbe's disease or of metachromatic leucodystrophy and to calculate the degree of disturbance in toxic polyneuritis, polyradiculoneuritis and some cranial nerve injuries; they were also useful in following up children undergoing chronic haemodialysis. In each case, NCV was only one aspect of a more complete neurophysiological study.