Pain assessment across developmental and cognitive abilities — branching viva

Opening (warm-up)

Examiner: A four-year-old is admitted overnight after a scald and lies still and silent; the registrar documents "comfortable," but the nurse scores seven out of ten. Walk me through how you assess this child's pain. [2]

Candidate: I start from the principle that self-report is the gold standard and that absence of behavioural signs is not absence of pain. For this four-year-old I ask the child first, offering the Faces Pain Scale-Revised, which is validated from about four to five years, and I read the self-report alongside behaviour. If self-report is not possible I score with FLACC — Face, Legs, Activity, Cry, Consolability, total out of ten — validated from two months to about seven years for acute and postoperative pain. The reason I do not trust the "comfortable" impression is that a young child in severe pain can freeze rather than cry, become still rather than thrash, and withdraw rather than seek comfort; the freeze response looks like comfort but marks severe pain, and autonomic signs habituate so observations can be normal. The seven-out-of-ten score and the clinical context — a fresh scald — justify analgesia, and I reassess against the predicted response and document the trend as the fifth vital sign. [1] [2]

Branch 1 — the developmental logic of self-report

Examiner: At what age can a child self-report, and which scales do you use? [3]

Candidate: Self-report becomes reliable at about four to five years with a Faces scale. I use the Faces Pain Scale-Revised — six gender-neutral faces scored 0 to 10 in two-point steps — which was validated toward a common metric in paediatric pain measurement and is among the best-validated and most preferred faces scales. From about eight years I add the Numerical Rating Scale, 0 to 10; the datasets supporting its use established that it is reliable and preferred from about eight years, and it should not be used routinely below that age because younger children cannot reliably map an abstract number onto an internal state. The common error is handing a faces scale to a child too young to separate the face-as-pain from the face-as-emotion, or a number scale to a child too young to handle the abstract mapping, so I match the instrument to the developmental age, not the chronological age. [3] [5]

Branch 2 — the child with cognitive impairment

Examiner: Now a non-verbal child with severe cerebral palsy after spinal fusion. How does your assessment change, and why does generic FLACC fail here? [6]

Candidate: Generic FLACC fails 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. I switch to 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 for pain assessment in children with cognitive impairment, and I use the Non-communicating Children's Pain Checklist, validated in its postoperative version, which scores seven domains of behaviour for the non-verbal child. A systematic review and meta-analysis of postoperative pain in children with cognitive impairment found under-recognition to be the persistent failure across studies, and individualised tools to be the remedy. The mother is the expert on his pain behaviour, so I ask her how today differs from his baseline — baseline change matters more than baseline level, because a habituated child may show little absolute behaviour. [6] [7] [9]

Branch 3 — the paralysed child in the PICU

Examiner: That child deteriorates and is intubated and paralysed in the PICU. How do you assess his pain now? [10]

Candidate: I use COMFORT-behaviour within an explicit sedation-and-pain framework, but I recognise that neuromuscular blockade removes the movement and much of the behaviour the observational tools depend on, so his behavioural score cannot be the sole basis for analgesia. He 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 the analgesia must be planned, not inferred from a quiet, still bedside. [10]

Branch 4 — distress versus pain

Examiner: How do you separate pain from fear, distress and delirium at the bedside? [2]

Candidate: I read the score alongside the context and the reversible non-pain drivers. Distress without nociception — fear, anxiety, separation, hunger, a full bladder, the unfamiliar environment — is real and deserves comfort, but treating it as pain and escalating an opioid is both an assessment failure and a medication risk, so I address the non-pain drivers first or in parallel and watch the response. In the critically ill or postoperative child I assess pain and sedation together so that an agitated, under-sedated child is not simply labelled as in pain, and I keep delirium on the differential when attention and awareness are disordered. In the child with neurodisability I separate a dystonic storm, a seizure or raised intracranial pressure from pain using the individualised tool and the carer's account. In every case I keep pain on the differential, score it with the right tool, and weigh the result against the confounders rather than discarding it. [2]

Branch 5 — the cycle and the evidence

Examiner: Give me your assessment cycle, and tell me what the systematic review of the FLACC scale concluded. [1]

Candidate: The cycle is five steps: choose the right instrument for this child at this moment; score honestly without leading the child or leaning on an impression; treat to the score and the clinical context; reassess against the predicted response; and escalate or step down along the documented trend. The reassessment converts a measurement into a clinical argument, because a score that has not moved after a reasonable dose asks whether the dose is too small, the route wrong, the diagnosis incomplete, or the behaviour driven by fear rather than nociception. The systematic review of the FLACC scale across infants and children found moderate to good reliability and validity and good feasibility, with the consistent limitation that the Legs and Activity domains are corrupted by pre-existing movement disorders and that the tool under-detects pain in the cognitively impaired and the habituated child — which is exactly why I switch to the revised FLACC and the NCCPC in those children. [1] [2]

Closing summary

Candidate: The one-line answer: ask the child first with a developmentally matched self-report scale, observe with FLACC when they cannot self-report, individualise with the revised FLACC or the Non-communicating Children's Pain Checklist for cognitive impairment, and treat every score as the fifth vital sign — reassessed after every analgesic, documented as a trend, and read against the clinical context rather than in isolation. [3] [6] [10]