Document Detail

Effect of prematurity and intrauterine growth restriction on H-reflex recovery cycle in neonates.
MedLine Citation:
PMID:  20816919     Owner:  NLM     Status:  In-Process    
OBJECTIVE: The purpose of this work was to assess the effects of prematurity and intrauterine growth restriction on spinal cord synapses using H-reflex.
METHODS: 33 babies were investigated at birth. 14 were full term appropriate for gestational age (FT AGA), 10 were full term intrauterine growth restricted (FT IUGR) and 9 were preterm appropriate for gestational age (PT AGA). The maximum amplitude of H-reflex (Hmax), H-reflex latency (HRL), H/M ratio, H-reflex conduction velocity (HRCV), and H-reflex response to double stimuli (conditioning and test) for H-reflex recovery cycle (HRRC) were recorded in right lower limb (soleus muscle) in all the three groups.
RESULTS: Percentage recovery values of H-reflex were significantly higher in FT AGA and FT IUGR babies compared to PT AGA neonates for most of inter-stimulus intervals. No significant differences were observed in H-reflex parameters between FT AGA and FT IUGR groups, but HRL and HRCV were significantly affected in PT AGA group.
CONCLUSIONS: Delayed H-reflex recovery in preterms may be due to a prolonged state of neurotransmitter delay in Ia terminals following initial activation by the conditioning stimuli. The cause of such prolonged depletion of neurotransmitters could be attributed to a poor neurotransmitter store in synaptic vesicles of spinal cord in preterm neonates.
B D Bhatia; Ayan Kumar; Deepshikha; Udai Prakash
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Publication Detail:
Type:  Journal Article     Date:  2010-09-17
Journal Detail:
Title:  Neuroscience letters     Volume:  488     ISSN:  1872-7972     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  107-11     Citation Subset:  IM    
Copyright Information:
Copyright © 2010. Published by Elsevier Ireland Ltd.
Department of Pediatrics, Unit of Neonatology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India. baldev
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