Procedural pain: topical anaesthesia, preparation, distraction and non-pharmacological support — formative SAQs

SAQ 1 (10 marks)

A 6-month-old previously well infant is brought to the emergency department for a febrile illness and requires a venepuncture and cannulation as part of the workup. The infant is alert and being nursed by the mother, who is distressed by the thought of her baby being hurt. The team has about 70 minutes before the bloods must be taken. ^{[1] [11]}

1. Outline the structured pre-procedure comfort assessment and the multi-modal comfort bundle you will apply, naming the specific agents, their concentrations and timings. (5) ^{[2] [9]}
2. Give the exact oral sucrose dose and timing you would use, and explain why the dose must not be expressed as millilitres per kilogram. (3) ^[3]
3. Explain why you will combine the layers rather than rely on a single measure, and cite the evidence. (2) ^[1]

Model answer — SAQ 1

(1) Assessment and bundle (5). I run a short structured assessment covering the child, the procedure, the allergies and the time. The child is a 6-month-old with no prior needle trauma and a parent who can hold; the procedure is a venepuncture and cannulation of moderate, brief pain needing the arm still; the allergies are none, and at six months there is no methaemoglobinaemia contraindication, so EMLA is acceptable; the time is about 70 minutes, which allows a full EMLA hour. The bundle: I apply EMLA (lidocaine 2.5% and prilocaine 2.5%) under an occlusive dressing for at least 60 minutes at the likely site (or two sites), engage the parent in an honest explanation, plan an upright comfort position on the mother's lap (chest-to-chest), run an age-appropriate distraction (a tablet video), and offer breastfeeding during the procedure or oral sucrose as the sweet/oral layer. ^{[2] [9]}

(2) Sucrose dose and timing (3). If breastfeeding is not used, I give oral sucrose 24%, 0.1 to 2 mL (maximum about 2 mL) about two minutes before the procedure and again as the needle goes in, onto the anterior tongue or buccal mucosa. The dose is an absolute volume, never millilitres per kilogram, because dosing per kilogram or in large volumes risks aspiration, chloride loading and overload, while the effective analgesic window is a small volume engaging the taste-bud to endogenous-opioid pathway. Giving it only as the needle is inserted (rather than two minutes before) is under-effective. ^[3]

(3) Why combine the layers (2). Each layer acts on a different limb of the pain response — topical anaesthesia blocks the skin sodium channel, sweet taste recruits endogenous opioid and dopamine, and distraction and comfort positioning engage gate-control and attentional modulation — so no single agent abolishes procedural pain. The Cochrane review on non-pharmacological management of infant and young child procedural pain found that combining non-pharmacological with pharmacological measures reduces procedural pain better than either alone, which is why the fellowship answer is always a bundle. ^[1]