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A study of peripheral nerve function in neonates and infants
Insights
Nerve conduction studies in neonates and infants reveal age-related changes. While H-reflex matures in lower limbs, upper limb responses suggest developing nervous system function in these young age groups.
Area of Science:
- Pediatric Neurology
- Neurophysiology
- Developmental Neuroscience
Background:
- Nerve conduction parameters undergo significant changes during early development.
- Understanding these changes is crucial for diagnosing neurological conditions in neonates and infants.
Purpose of the Study:
- To investigate age-related changes in motor and sensory nerve conduction velocity, H-reflex, and F-response in neonates and infants.
- To determine the relationship between age, height, and nerve conduction parameters in this population.
Main Methods:
- Studied motor and sensory nerve conduction velocity, H-reflex, and F-response in neonates and infants.
- Analyzed nerve conduction velocity in upper and lower limbs.
- Assessed H-reflex elicitation in Abductor Pollicis Brevis (APB) and Soleus muscles.
Main Results:
- Neonatal nerve conduction velocities were 25 M/S (upper limb) and 23.75 M/S (lower limb).
- Infant nerve conduction velocities were 34.4 M/S (upper limb) and 32.4 M/S (lower limb).
- Age significantly correlated with nerve conduction parameters in infants but not neonates; H-reflex was less consistently elicited in the hand (APB) in infants compared to neonates.
Conclusions:
- Nerve conduction parameters show significant maturation from neonate to infant stages.
- The developing nervous system impacts H-reflex elicitation, particularly in upper limb muscles.
- Age and height are important factors influencing nerve conduction and H-reflex latency in infants.
Abstract:
Motor and sensory nerve conduction velocity, H-reflex and F-response have been studied in the age group showing maximum changes i.e. neonates and infants. The nerve conduction velocity in upper and lower limbs was 25 M/S and 23.75 M/S respectively in neonate age group; 34.4 M/S and 32.4 M/S respectively in infant group. A significant relationship of age with nerve conduction parameters (velocity, terminal latency) has been observed in infants group but not so in neonate group. H-reflex (late response) was elicited in both Abductor Pollicis Brevis and Soleus. It was present in small muscles of hand (i.e. APB) in all the neonates and 55% of the infants only. This could be attributed to immaturity of nervous system. However, in the lower limb, H-reflex could be elicited in 100% of infants and neonates. In the present study, the relationship of age and height with different nerve conduction parameters as well as H-reflex (latency) has been highlighted.