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Biobehavioral pain responses in former extremely low birth weight infants at four months' corrected age
T F Oberlander1, R E Grunau, M F Whitfield
1Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada. timothyo@interchange.ubc.ca
Insights
Extremely low birth weight (ELBW) infants showed similar overall pain responses compared to term-born infants. However, subtle differences in autonomic responses and behavioral recovery were noted in ELBW infants.
Area of Science:
- Neonatalogy
- Developmental Pediatrics
- Pain Research
Background:
- Extremely low birth weight (ELBW) infants experience significant pain during neonatal intensive care.
- Understanding long-term biobehavioral pain responses in these vulnerable infants is crucial.
- Previous research suggests altered pain responses in former ELBW infants.
Purpose of the Study:
- To compare acute pain-induced biobehavioral responses at 4 months corrected age.
- To assess differences between former ELBW infants and term-born controls.
- To investigate potential long-term effects of neonatal pain exposure.
Main Methods:
- Compared facial behavior and cardiac autonomic reactivity in 21 ELBW infants and 24 term-born controls during a finger-lance procedure.
- Quantified neonatal painful procedures experienced by both groups.
- Analyzed responses during baseline, pain (lance), and recovery phases.
Main Results:
- Overall behavioral and cardiac autonomic responses to acute pain were similar between ELBW and control infants.
- ELBW infants exhibited less parasympathetic withdrawal during the lance and sustained sympathetic response during recovery.
- Distinct behavioral recovery patterns (early and late) were observed in ELBW infants post-procedure.
Conclusions:
- Biobehavioral pain responses are largely similar between former ELBW infants and term-born controls at 4 months corrected age.
- Subtle differences in autonomic regulation and behavioral recovery suggest potential lingering effects of early pain experiences or developmental lags.
- Findings contrast with some prior studies and highlight the complexity of assessing long-term pain responses in preterm infants.
Objective:
To compare biobehavioral responses to acute pain at 4 months' corrected age between former extremely low birth weight (ELBW) infants and term-born controls.
Methodology:
Measures of facial behavioral and cardiac autonomic reactivity in 21 former ELBW infants (mean birth weight = 763 g) were compared with term-born infants (n = 24) during baseline, lance, and recovery periods of a finger-lance blood collection. Further, painful procedures experienced during neonatal care were quantified in both groups.
Results:
Overall, behavioral and cardiac autonomic responses to the lance were similar between groups. However, the ELBW group seemed to have a less intense parasympathetic withdrawal in the lance period and a more sustained sympathetic response during recovery than the control group. Further, in the recovery period, two behavioral patterns (early recovery and a late recovery) were apparent among the ELBW group.
Conclusions:
Biobehavioral pain responses were similar overall between both groups of infants. Subtle differences were observed in cardiac autonomic responses during the lance period and in behavioral recovery among ELBW infants. Whether these findings represent a long-term effect of early pain experience or a developmental lag in pain response remains unclear. The lack of an overall difference runs counter to previously reported findings of reduced behavioral response in former ELBW infants. biobehavioral pain response, premature infants, repetitive pain, heart rate variability.