Clinical Report: Physiological Indicators of Pain in Preterm Infants

Overview

This meta-analysis synthesizes evidence on physiological responses to pain in preterm infants, identifying significant increases in heart rate and cortisol levels, alongside decreases in heart rate variability and oxygen saturation.

Background

Preterm infants frequently undergo painful procedures in neonatal intensive care, which can have lasting effects on their neurodevelopment. Understanding physiological responses to pain is crucial.

Data Highlights

Key Findings

• Painful procedures significantly increase heart rate by an average of 12.6 bpm.
• Cortisol levels rise significantly in response to pain (SMD = +0.68).
• Heart rate variability decreases significantly (SMD = −0.81) during painful procedures.
• Oxygen saturation decreases by an average of 4.3% (p < 0.01).
• Melatonin levels decrease significantly (SMD = −0.54).
• Cerebral oxygenation decreases by 8.5% (p < 0.001).

Clinical Implications

The study presents physiological indicators such as heart rate and cortisol levels in relation to pain assessment.

Conclusion

The physiological responses observed in preterm infants during painful procedures highlight the importance of objective pain assessment methods.

Related Resources & Content

1. Frontiers in Pediatrics, 2026 -- Physiological Correlates of Pain in Preterm Infants: Evidence from a Meta-Analytic Approach
2. American Academy of Pediatrics, 2025 -- Prevention and Management of Procedural Pain in the Neonate: An Update
3. Frontiers in Pediatrics — Early-life painful and stressful exposures and neurodevelopment in preterm infants
4. Intensive Care Medicine — Guidelines for Evaluating Pain, Sedation, Withdrawal, and Delirium in Critically Ill Pediatric Patients: An ESPNIC Statement for Healthcare Providers
5. Frontiers in Pediatrics — Nurses’ perspectives on pain management in pediatric care: systematic review and meta-synthesis
6. npj Digital Medicine — Pain assessment using physiological responses/markers in different types of pain: a scoping review
7. Prevention and Management of Procedural Pain in the Neonate: An Update | Pediatrics | American Academy of Pediatrics
8. Frontiers | Physiological Correlates of Pain in Preterm Infants: Evidence from a Meta-Analytic Approach
9. Pain in very preterm infants-prevalence, causes, assessment, and treatment. A nationwide cohort study. - International Association for the Study of Pain (IASP)