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Prematurity and neonatal noxious events exert lasting effects on infant pain behaviour

Huda M Abdulkader1, Yvonne Freer, Emer M Garry

  • 1Department of Child Life and Health, University of Edinburgh, UK.

Early Human Development
|October 30, 2007
PubMed

Insights

Heel prick sensitivity is altered in preterm infants compared to full-term infants for up to one year. This suggests prolonged effects of preterm birth or procedures on infant nervous system development.

Area of Science:

  • Neonatal Neuroscience
  • Developmental Pediatrics
  • Pain Perception

Background:

  • Prolonged exposure to noxious stimuli may impact the developing nervous system of preterm infants.
  • Understanding the long-term effects of common neonatal procedures is crucial for infant care.

Purpose of the Study:

  • To investigate the medium and long-term effects of repeated heel pricks on pain sensitivity in infants.
  • To compare pain threshold responses between preterm and full-term infants throughout the first year of life.

Main Methods:

  • Two studies were conducted: a longitudinal study (2 days and 4 weeks post-heel prick) and a cross-sectional study over the first year.
  • Participants included healthy preterm (PT) and full-term (FT) infants, grouped by postterm age.
  • Pain sensitivity was assessed by measuring threshold responses (flexion withdrawal, gross body movements, grimace) to mechanical stimuli.

Main Results:

  • Preterm infants exhibited significantly lower (increased sensitivity) pain thresholds compared to full-term infants for flexion withdrawal and gross body movements.
  • These differences persisted throughout the first year of life.
  • While pain thresholds generally increased with age in both groups, preterm infants consistently remained more sensitive.

Conclusions:

  • Preterm birth or associated medical procedures significantly alter pain sensitivity thresholds in preterm infants.
  • These altered sensitivity thresholds persist for at least the first year of life, indicating potential long-term neurological effects.
  • Findings highlight the need for careful pain management strategies in preterm infants.
Abstract

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