Neonatal pain assessment and procedural comfort - formative SAQs

SAQ 1 - The preterm infant and repeated heel lances (20 marks, ~15 minutes)

A 27-week gestation infant, now 10 days old and growing well on continuous gastric feeds, is having capillary gases taken by heel lance twice daily as part of a planned course. With each lance the infant grimaces, desaturates, and goes rigid. The bedside nurse asks you how to make the lances less painful. ^[1]

Questions

1. Explain, with reference to the neuroscience, why this infant is particularly vulnerable to procedural pain. (5 marks) ^[1]
2. Outline the stepwise comfort measures you would apply before and during the heel lance, giving the oral sucrose regimen in full. (8 marks) ^[4]
3. State which validated pain-assessment tool you would use, what it scores, and when you would document the score. (4 marks) ^[2]
4. Give one further measure that reduces the cumulative pain burden of this infant's admission. (3 marks) ^[6]

Model answer (must-hit)

1. The nociceptive system matures early: free nerve endings are present by six to eight weeks, the spinothalamic tract myelinates from around twenty weeks, and thalamo-cortical connections are functional by term. The preterm brain is hyper-excitable because excitatory glutamatergic transmission predominates while descending GABAergic inhibition is immature, so the infant feels more pain per stimulus, not less. Repeated untreated pain is associated with altered somatosensory processing and impaired neurodevelopmental outcome. ^[1]

2. Minimise procedures and cluster cares; calm the environment (low light, low noise); position with facilitated tucking or swaddling; offer non-nutritive sucking and skin-to-skin where feasible. Give oral sucrose 24% at 0.1 to 2 mL/kg with non-nutritive sucking approximately two minutes before the procedure. Prefer venepuncture over heel lance where a sample allows it, because venepuncture is less painful. Sucrose is for procedural pain and is not a substitute for major analgesia. ^{[4] [9]}

3. Use the Premature Infant Pain Profile or its revised form (PIPP/PIPP-R). It combines gestational age, behavioural state, heart-rate change, oxygen-saturation change, brow bulge, eye squeeze and the nasolabial furrow. Score before the procedure and again after the comfort intervention, and document both. ^[2]

4. Reduce the cumulative burden by avoiding non-urgent procedures, bundling blood tests to a single sampling event, and using environmental redesign with protected sleep - every procedure avoided is a pain episode that never happens. ^[6]