Assess a child's pain across developmental and cognitive ability — OSCE

Candidate instructions

You are the paediatric registrar on the ward. A nine-year-old boy with severe cerebral palsy is on day one after posterior spinal fusion. He is non-verbal, documented as "settled," but his mother says he is "not right," grimacing and arching intermittently. You have 8 minutes to assess his pain, choose and apply the correct validated tool, involve the mother, set the reassessment and documentation plan, and explain how the plan changes if he is admitted to the PICU and requires neuromuscular blockade. [6]

The four tasks are: explain why the generic behavioural approach is unsuitable for this child and which validated tool you use instead; involve the mother as the expert on this child's baseline pain behaviour and explain what baseline change means; set the reassessment and documentation plan that protects him across the postoperative course; and explain how the plan changes if he is intubated and paralysed in the PICU. [6] [10]

You may use the mother as the simulated participant. You do not need to prescribe the analgesic regimen in detail, but you must link each score to a documented analgesic decision and a reassessment. [9]

Encounter script (examiner / simulated parent)

Simulated parent (opening): "He's had his big back operation. The nurses say he's settled, but he's not right — he keeps screwing his face up and going stiff and arching, and that's his pain face, I know him. Can't you give him something?" [6]

If the candidate applies generic FLACC without acknowledging it is corrupted by the dystonia: "But he's always stiff and arching with his cerebral palsy — how does that tell you anything about pain today?" [9]

If the candidate ignores the mother's account of the baseline: "I've known him nine years. I know what his pain looks like. Surely that counts?" [6]

If the candidate sets a plan that includes individualised scoring, parent involvement, reassessment and PICU paralysis reasoning: "Okay. So what do you want me to watch for, and what happens if he ends up in intensive care?" [10]

Model answer and marking domains

Domain 1 — Why generic FLACC fails and the correct tool (3 marks). The candidate explains that generic FLACC is corrupted in this child because the Legs and Activity domains are confounded by his baseline dystonia, spasticity, scoliosis and immobility, so a generic score can read as comfort while he is in severe postoperative pain, and that under-recognition of pain in cognitively impaired children is the persistent failure across the literature. The candidate selects the revised FLACC, which retains the FLACC structure but allows individualised, parent-described behaviours to be added under each category and which showed improved reliability and validity in children with cognitive impairment, and the Non-communicating Children's Pain Checklist, validated in its postoperative version for non-verbal children. The candidate cites the head-to-head comparison of clinical utility confirming that individualised instruments serve these children best. [6] [7] [8]

Domain 2 — The mother as expert and baseline change (3 marks). The candidate treats the mother as the expert on this child's pain behaviour, asks her to describe his baseline pain behaviour (his "pain face," the grimacing, the arching, the changes in tone and sleep) and to say how today differs from that baseline. The candidate states the principle that baseline change matters more than baseline level: a child whose behaviour has moved away from his own normal is in trouble even if the absolute score looks modest, because a habituated child may show little absolute behaviour while experiencing significant pain. The candidate acts on the mother's "not right" as a baseline-change signal, and folds her description into the individualised scoring. [6] [9]

Domain 3 — Reassessment and documentation (3 marks). The candidate sets a plan that scores the revised FLACC or Non-communicating Children's Pain Checklist at regular intervals, links each score to an analgesic decision, and reassesses after every analgesic against the predicted response. The candidate documents the score in the chart as the fifth vital sign so the team inherits a trajectory rather than a single number, and escalates to a senior review when the trajectory is flat or rising after a reasonable dose, reconsidering the dose, the route, the diagnosis and whether distress rather than nociception is driving the behaviour. [1] [9]

Domain 4 — The PICU and neuromuscular blockade (3 marks). The candidate states that if the child is admitted to the PICU and requires neuromuscular blockade, COMFORT-behaviour is used within an explicit sedation-and-pain framework, but that neuromuscular blockade removes the movement and much of the behaviour the observational tools depend on, so the behavioural score cannot be the sole basis for analgesia. The child therefore carries an explicit, scheduled analgesic plan that matches the anticipated noxious stimulus — the surgical incision and the critical-care interventions such as suctioning and line insertion — with the behavioural and physiological signs read as supportive rather than decisive, and the plan revisited as sedation lightens. The principle is that the experience of pain continues while the behaviour is pharmacologically removed, so analgesia must be planned rather than inferred. [10]

Examiner global rating anchors

• Pass (clear): Rejects generic FLACC for a child whose dystonia corrupts it, selects the revised FLACC or NCCPC, treats the parent as the expert on baseline behaviour, links each score to an analgesic decision with a documented reassessment, and explains why a paralysed child needs an analgesic plan independent of behaviour. Cites at least the cognitive-impairment tool evidence and the COMFORT-behaviour principle. [6] [10]

High-yield pitfalls for the candidate

• Applying generic FLACC to a child with dystonia and cerebral palsy and trusting the low score — the Legs and Activity domains are confounded by the baseline movement disorder. [9]
• Dismissing the mother's account of the baseline — she is the expert on this child's idiosyncratic pain behaviour, and baseline change is the most sensitive signal available. [6]
• Recording a score once and never reassessing — a single number neither confirms the analgesia worked nor exposes that it did not; the reassessment is the assessment. [1]
• Reading a low behavioural score as comfort in a paralysed PICU child — neuromuscular blockade removes the behaviour while leaving the nociception and the experience intact. [10]