Determining behavioural and physiological responses to pain in infants at risk for neurological impairment

Area of Science:

• Neonatal care
• Pain assessment
• Neurology

Background:

• Infant pain assessment is validated, but data on infants at risk for neurologic impairment (NI) is limited.
• Understanding pain responses in neurologically at-risk infants is crucial for appropriate care.

Purpose of the Study:

• To compare pain responses to heel lance in neonates with varying risks for NI.
• To investigate if infants at risk for NI exhibit different pain indicators compared to lower-risk infants.

Main Methods:

• Prospective observational cohort study involving 149 neonates (gestational age >25-40 weeks) across three risk groups for NI.
• Pain responses assessed via facial actions, heart rate (HR), oxygen saturation, and cry fundamental frequency during heel lance.
• Heart Rate Variability (HRV) analyzed for differences across risk cohorts and pain phases.

Main Results:

• A significant interaction between risk cohort and pain phase was observed for facial actions, with lower-risk infants showing more facial activity.
• All infants showed significant changes in HR and oxygen saturation during heel lance, with no cohort differences.
• Infants at moderate and high NI risk exhibited higher minimum and mean fundamental cry frequencies and greater decreases in HRV.
• Significant cohort by phase interactions were found for HRV, indicating altered autonomic responses in at-risk infants.

Conclusions:

• While all infants respond to painful stimuli, those at moderate to highest risk for NI demonstrate diminished pain responses in specific indicators.
• Findings suggest that infants at risk for NI may have altered pain processing, necessitating further investigation and potentially individualized pain management strategies.