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Motor nerve conduction velocity & Hoffman's reflex latency in newborns
B D Bhatia1, U Prakash, S K Gupta
1Department of Paediatrics, Banaras Hindu University, Varanasi.
The Indian Journal of Medical Research
|October 1, 1993
Summary
Preterm infants show lower motor nerve conduction velocity and higher Hoffman
Area of Science:
- Neonatal Neurology
- Developmental Pediatrics
- Neurophysiology
Background:
- Differentiating between full-term and preterm infants, especially those with low birth weight, is crucial for appropriate medical care.
- Nerve conduction studies and reflex assessments can provide objective measures of neurological development in newborns.
- Understanding variations in motor nerve conduction velocity (MNCV) and Hoffman's reflex latency (H-RL) can aid in identifying developmental differences.
Purpose of the Study:
- To evaluate the influence of various factors on the motor nerve conduction velocity (MNCV) and Hoffman's reflex latency (H-RL) in newborns.
- To determine if MNCV and H-RL can effectively differentiate between full-term appropriate for gestational age (FT-AGA), preterm appropriate for gestational age (PT-AGA), and full-term intrauterine growth retarded (FT-IUGR) infants.
Main Methods:
- A study involving 72 newborn infants and their mothers.
- Measurement of motor nerve conduction velocity (MNCV).
- Assessment of Hoffman's reflex latency (H-RL).
Main Results:
- Preterm appropriate for gestational age (PT-AGA) infants exhibited significantly lower MNCV and significantly higher H-RL compared to full-term appropriate for gestational age (FT-AGA) infants.
- PT-AGA infants also showed significantly lower MNCV and higher H-RL compared to full-term intrauterine growth retarded (FT-IUGR) infants.
- Full-term intrauterine growth retarded (FT-IUGR) infants had significantly reduced MNCV compared to FT-AGA infants, but no significant difference in H-RL.
Conclusions:
- Motor nerve conduction velocity (MNCV) and Hoffman's reflex latency (H-RL) are valuable electrophysiological parameters for distinguishing between different newborn classifications.
- Lower MNCV and higher H-RL are characteristic findings in preterm infants, indicating potential neurological differences.
- Reduced MNCV in full-term intrauterine growth retarded infants suggests impaired nerve development.