Branching cross-examination

This is a MedVellum formative viva. It is not an official RACP, MRCPCH, ABP, ACGME or RCPSC station, mark scheme, duration or pass standard. Release each update only after the candidate states the severity, immediate action and reassessment endpoint. [18] [21]

Candidate brief

You are the senior paediatric clinician supporting a rural district emergency department. Speak as you would during resuscitation. Treat immediate threats before the diagnosis is certain, and say what you will reassess. This is one continuous case. Each escalation branch leads to the next update. [1] [12] [21]

Question 1 — Doorway first impression

Stimulus update. A parent carries a four-year-old into the resuscitation room after two days of cough and poor intake. Before touching the child, you see poor tone and little eye contact. The child gives a weak two-word response. There is nasal flaring and marked intercostal recession. The child is not visibly pale, mottled or cyanosed. Question: What do you say and do now? [1] [2] [22]

Consultant-level model answer. “I am immediately concerned. Appearance is abnormal because tone, interaction and speech are reduced. Work of Breathing is abnormal because there is flaring and recession. Circulation to Skin is not visibly abnormal. At this moment, the PAT shows a respiratory-failure pattern. I call the paediatric resuscitation team and start age-adapted ABCDE. Where safe, I keep the child with the parent in a position of comfort. I use the three canonical PAT domains from the American Academy of Pediatrics PEPP framework. I do not let PAT delay treatment.” [1] [2]

Probing follow-up. “What are the three canonical PAT domains?” A strong answer is: “I assess Appearance through tone, interactiveness, consolability, look or gaze, and speech or cry. I assess Work of Breathing through visible or audible effort. I assess Circulation to Skin through pallor, mottling or cyanosis. I measure capillary refill, pulse, blood pressure, oxygen saturation and temperature during ABCDE. I apply PEWS afterwards within its local response system. I do not add these measurements to canonical PAT.” [1] [2] [6]

Common weak answer. “The child looks septic, so I will take bloods and calculate a PEWS.” This assumes a cause before describing the physiology. It also delays ABCDE and confuses PAT with measured assessment and a local response system. [1] [8] [12]

Escalation branch. If the candidate calls for help and starts ABCDE, release the observations in Question 3. If they diagnose pneumonia, bronchiolitis or sepsis, ask Question 2 first. Withhold investigations until they identify what is failing now. [1] [12] [22]

Question 2 — Pattern without premature diagnosis

Stimulus update. The triage note says “probable pneumonia.” There has been no auscultation, imaging or microbiology. Question: What does the PAT show, and which causes remain possible? [1] [4] [22]

Consultant-level model answer. “I interpret abnormal Appearance and Work of Breathing as a respiratory-failure pattern. It does not prove the cause. My immediate threats are ineffective oxygenation, ineffective ventilation and fatigue. I keep airway obstruction, lower-airway disease and parenchymal disease open. I also consider impaired respiratory drive, neuromuscular disease, cardiac or pulmonary-vascular disease, shock, metabolic disease and toxin exposure. Infection is plausible from the history. I still prioritise the failing physiology. I refine the cause through focused history, examination, targeted tests and repeated response assessment.” [1] [12] [22] [23]

Probing follow-up. “Can a normal PAT occur with serious disease?” A strong answer is: “Yes. A normal PAT means only that the first impression is stable at that moment. It does not exclude occult or evolving disease. I still consider age, diagnostic risk, caregiver concern, measured observations and direction of change. I do not use a normal PAT alone to justify discharge.” [3] [4] [15]

Common weak answer. “The PAT diagnoses respiratory failure due to pneumonia.” PAT can describe the respiratory-failure pattern. It cannot establish pneumonia from one respiratory sign or a triage label. [1] [2] [22]

Escalation branch. If the candidate keeps competing causes open, provide the full ABCDE data in Question 3. If they anchor on infection, state that no fever has yet been measured. Ask which respiratory, cardiac, metabolic or toxic threats could be missed while waiting for an infection work-up. [4] [12] [22] [23]

Question 3 — ABCDE threats and response endpoints

Stimulus update. Airway is patent, but the voice is weak. There is intermittent grunting and no stridor. Respiratory rate is 48 per minute, with marked recession and reduced bilateral air entry. Oxygen saturation is 91%. The waveform is reliable, and the displayed pulse matches the palpated pulse. Heart rate is 156 per minute. The limbs are warm, central pulses are strong and blood pressure is preserved. The child responds to voice but cannot sustain interaction. Fever is now documented. There is no rash or obvious bleeding. Question: Lead the next five minutes. What improvement do you expect from each action? [5] [11] [12] [22]

Consultant-level model answer. “I take leadership and allocate airway, breathing, circulation, access or drugs, documentation and family roles. I use age- and weight-appropriate equipment. I call airway and critical-care support now. For A, I want an airway the child can maintain without worsening distress. For B, I use respiratory support from the active local pathway. I want saturation to improve with a reliable waveform and matching pulse. I also want better air entry, effective ventilation, less work and better interaction. For C, I obtain access without allowing repeated attempts to delay care. I assess likely shock type and any loss. I look for improvement in pulse quality, skin, mental state, urine output, blood pressure and direction of change. I do not rely on one number. For D, I protect airway and breathing, assess consciousness and pupils, and check glucose. Altered interaction and poor intake make glucose immediately relevant. For E, I expose only enough to find rash, injury, bleeding or device problems. I preserve temperature and dignity. I then reassess from A. The Resuscitation Council UK 2025 PLS guidance is a named UK source for immediate ABCDE and reassessment. In this rural service, I follow the active regional pathway.” [11] [12] [13] [23]

Probing follow-up. “Why is saturation alone an unsafe breathing endpoint?” A strong answer is: “I first confirm a reliable waveform and check that the displayed pulse matches the child. Pulse oximetry can be technically unreliable and may overestimate oxygenation, including in darker skin. It does not measure ventilation. I therefore reassess air entry, effort, respiratory drive, interaction and perfusion as well as saturation.” [11] [22]

Common weak answer. “Give oxygen, fluids and antibiotics, then repeat observations in an hour.” This starts a cause-led bundle before defining the shock type. It misses airway and neurological threats, gives no action-specific endpoint, and delays reassessment. [12] [13] [14]

Escalation branch. Once the candidate gives several breathing endpoints, reveal that saturation improves while breathing becomes less effective. If they gave no endpoint, ask how a reassuring monitor could coexist with respiratory failure. [11] [12] [22]

Question 4 — The breathless child becomes quiet

Stimulus update. After positioning and initial respiratory support, saturation is 96%. The waveform is reliable, and the displayed pulse matches palpation. Recession looks less marked. However, the child is quieter, and respiratory rate falls to 30 per minute. Air entry is barely audible, and the response to voice is slower. Question: Has the child improved? [11] [12] [22]

Consultant-level model answer. “No. I need improvement in breathing effectiveness, not just less visible effort. Poorer air entry and falling interaction suggest fatigue and impending respiratory failure. I repeat A and B immediately and declare the deterioration aloud. I escalate respiratory support and call airway expertise through the local pathway. I prepare for further deterioration and reassess circulation and glucose. I define success as a maintainable airway, effective ventilation and better air entry. I also require better interaction and stable perfusion. Saturation must improve with a reliable waveform and a displayed pulse matching the child. A quieter chest and one improved saturation do not meet those endpoints.” [11] [12] [22] [23]

Probing follow-up. “When would the lower respiratory rate be reassuring?” A strong answer is: “I would be reassured only if air entry and interaction also improve. Effort should fall without a new neurological concern. Perfusion must remain stable. Oxygen saturation should have a reliable waveform and a displayed pulse matching the child. I judge the change across systems and against the response I expected.” [5] [11] [12]

Common weak answer. “The oxygen worked because saturation rose and respiratory rate fell.” This mistakes monitor change for recovery. It can miss worsening ventilation and fatigue. [11] [12]

Escalation branch. If the candidate recognises fatigue, reveal the new perfusion findings in Question 5. If they wait for a gas or radiograph, ask whether ventilation could fail before the result arrives. Require action before diagnostic completion. [12] [22]

Question 5 — Circulation changes while blood pressure is preserved

Stimulus update. The child becomes pale and mottled. The hands are cool, peripheral pulses are weak and central pulses remain palpable. Capillary refill is prolonged using the local chart’s documented technique. Urine output is unclear. Blood pressure remains within the local age band, and heart rate is now 160 per minute. Question: What does this mean, and how will you assess circulation? [5] [6] [7] [12]

Consultant-level model answer. “I recognise that Circulation to Skin is now abnormal. I interpret the ABCDE findings together as shock despite preserved blood pressure. I do not wait for hypotension. I control any obvious loss. I reassess pulse quality, skin perfusion and mental state. I check urine output, blood pressure, access, cardiac clues and device function. I record the capillary-refill technique and interpret it in context. I keep hypovolaemic, distributive, cardiogenic, obstructive and mixed shock possible. I choose treatment through the local pathway for the likely shock type and available rescue support. Before acting, I state the expected response. I reassess after every aliquot or action. I stop ineffective repetition and stop if overload develops. I activate critical-care or retrieval support in parallel.” [6] [7] [12] [13] [14]

Probing follow-up. “Does normal capillary refill exclude shock?” A strong answer is: “No. Site, compression, temperature, technique and observer affect capillary refill. A normal result is not sensitive enough to exclude shock. I use it during C of ABCDE with the other circulation findings. I do not put it inside canonical PAT.” [6] [7]

Common weak answer. “The blood pressure is normal, so this is compensated dehydration. I will repeat standard fluid boluses until the heart rate normalises.” This fixes the shock type and treatment too early. It ignores respiratory or cardiogenic risk and relies on one response marker. [12] [13] [14]

Escalation branch. If the candidate integrates the shock signs and gives stop endpoints, reveal a falling heart rate with worsening interaction. If they rely on blood pressure, state that mottling and weak pulses worsen while pressure is unchanged. Ask which findings should drive escalation. [5] [12]

Question 6 — Neurological deterioration and reversible threats

Stimulus update. Heart rate falls from 160 to 112 per minute. The child is now difficult to rouse, pulses remain weak and breathing is shallow. A generalised convulsion starts and continues for five minutes. Bedside glucose is unexpectedly low. Question: How do you interpret this, and what do you do? [12] [23]

Consultant-level model answer. “I interpret the lower heart rate as decompensation, not recovery. Breathing, interaction and perfusion have all worsened. I call a peri-arrest emergency and return to A and B. I support airway and breathing while continuing circulation support and monitoring. I time the seizure, prevent injury and address reversible threats. At five minutes, I activate the current status pathway. I correct the clinically dangerous low glucose immediately through the local age- and context-specific pathway. When feasible, I obtain confirmatory and diagnostic samples without delaying correction. I document the glucose recheck and escalate if it does not correct. Resuscitation Council UK 2025 PLS is the named source for activating status care at five minutes. The Royal Children’s Hospital Melbourne hypoglycaemia guideline supports checking, confirming when feasible, correcting, rechecking and escalating. Neither source provides one universal regimen for every child in this viva.” [12] [23]

Probing follow-up. “What does improvement after glucose correction prove?” A strong answer is: “It proves no single diagnosis. It shows that a reversible metabolic threat contributed. Hypoxia, poor ventilation, shock, seizure, toxin, endocrine or metabolic disease, and systemic illness may coexist. I repeat full ABCDE and investigate the cause.” [12] [23]

Common weak answer. “The heart rate has normalised, and the seizure is probably febrile. I will wait for laboratory confirmation of glucose.” This ignores decompensation across several systems. It labels the cause too early and delays correction of a dangerous reversible threat. [12] [23]

Escalation branch. If the candidate treats the seizure and low glucose while continuing ABCDE, reveal the partial recovery in Question 7. If they focus only on the seizure, ask who is maintaining ventilation and perfusion. Ask which recheck will detect recurrence or non-response. [12] [23]

Question 7 — Reassessment after partial response

Stimulus update. Convulsions stop, and glucose corrects on recheck. Interaction improves slightly. Oxygen saturation has a reliable waveform and matches the palpated pulse. Perfusion is better but not normal. The child still needs respiratory support and is again tachycardic for exact age. The child has not returned to the parent-described baseline. Question: Give your reassessment and next decision. [5] [12] [15] [23]

Consultant-level model answer. “I call this a partial response, not recovery. I repeat PAT and full ABCDE. I compare airway maintenance, breathing effectiveness, pulse, perfusion, consciousness and glucose with my stated endpoints. I also reassess temperature, urine output, device function and treatment adverse effects. I record the time, conditions and direction of change. I revise the differential without treating response as proof of one cause. I continue escalation because respiratory support and important threats remain. One reassuring observation does not offset them. I interpret exact-age observations with the active local chart. The Royal Children’s Hospital Melbourne acceptable ranges are one institutional example for unwell children. They are not universal normal values, PEWS triggers or treatment targets.” [5] [12] [23]

Probing follow-up. “When will you reassess?” A strong answer is: “I reassess after every intervention, procedure, position change or location change. I also reassess after any meaningful observation or caregiver-reported change. Greater acuity means more frequent reassessment. I do not substitute one fixed interval for that loop.” [12] [15] [21]

Common weak answer. “The observations have improved, so I will finish the investigations and review later.” This ignores ongoing respiratory support, personal baseline, recurrence risk and treatment harm. [12] [15] [21]

Escalation branch. If the candidate calls this a partial response and continues escalation, reveal the PEWS and caregiver concern. If they declare recovery, quote the parent: “This is still completely unlike them.” Ask whether the score or the concern should determine the next step. [8] [15]

Question 8 — PEWS, clinician judgement and caregiver concern

Stimulus update. The local electronic PEWS is now low after oxygenation and glucose improve. The parent repeatedly says, “They have never been this quiet after treatment.” A nurse is also worried. Question: Does the low score change your escalation? [8] [9] [15]

Consultant-level model answer. “No. I use the score as one part of the local recognition-and-response system. It is not a diagnosis or a veto. I document the remaining physiological problems and the direction of change. I record how the child differs from baseline, the parent’s words and the nurse’s concern. I verify that observations are complete. I check measurement technique, waveform and pulse agreement where relevant. I repeat ABCDE and escalate through the clinician- or family-concern route despite the score. NHS England National PEWS applies to general wards in England and allows independent clinician or carer escalation. The Australian Commission deterioration standard requires individual monitoring and locally agreed criteria, including worry and direct family escalation. It does not impose one national paediatric score.” [8] [9] [15]

Probing follow-up. “Does caregiver concern have one universal likelihood ratio or response tier?” A strong answer is: “No. A strong prospective Australian cohort found an independent association with critical illness. It was a single-centre study, so I do not claim one global likelihood ratio or response tier. I ask about the concern, document it, investigate it and provide an escalation route.” [15]

Common weak answer. “PEWS is objective, so I will reassure the parent and observe.” PEWS tools differ between systems. This answer discards personal baseline and direction of change. EPOCH did not show lower all-cause hospital mortality after BedsidePEWS implementation. [8] [9] [15]

Escalation branch. If concern overrides the low score, reveal the child’s complex baseline in Question 9. If the candidate dismisses the parent, ask what the score cannot know about usual communication, devices and previous responses. [15] [16]

Question 9 — Complex baseline, disability and device dependence

Stimulus update. The parent says the child has severe neurodisability and communicates reliably through gaze and smiling. The child receives gastrostomy feeds and uses nocturnal non-invasive ventilation. The first handover only said “non-verbal at baseline.” The parent says gaze, smile, tone and breathing are all markedly different from usual. The home ventilator circuit alarmed before departure. Question: How does this change your assessment without explaining away danger? [15] [16]

Consultant-level model answer. “I establish the child’s personal baseline. I ask about communication, tone, movement, pain behaviour, usual heart and respiratory rates, and saturation. I ask about respiratory support, feeds, urine output, devices, the emergency plan and previous helpful or harmful treatments. I assess the child and device together. I compare current findings with the usual baseline and use the personal plan. I treat all new ABCDE threats at the same time. I do not assume that chronic abnormal observations are harmless. I also do not claim that adapting the examination has a separately validated diagnostic sensitivity. I speak directly to the child through the preferred method. If language access is needed, I use a professional interpreter rather than an ad hoc family interpreter.” [15] [16] [17] [21]

Probing follow-up. “Can you still use PAT?” A strong answer is: “Yes. I use PAT as the child’s current first impression and compare it with the known baseline. Evidence is sparse in children with complex congenital, developmental or technology-dependent baselines. Loss of usual gaze or interaction may make Appearance abnormal. I still assess the device and complete hands-on ABCDE.” [2] [3] [16]

Common weak answer. “The reduced interaction is their disability, and the abnormal observations are chronic.” This is diagnostic overshadowing. It ignores the parent’s specific account of change and the device alarm. [15] [16]

Escalation branch. If the candidate integrates personal baseline and device function, reveal the retrieval delay in Question 10. If not, repeat the parent’s baseline account. Require a severity statement framed as “usual versus now.” [15] [16] [21]

Question 10 — Rural retrieval and delayed transport

Stimulus update. The district hospital has no paediatric intensive-care service. One clinician has advanced airway skills. The team has limited ability to provide prolonged ventilation or vasoactive support. Weather means retrieval cannot arrive for about 90 minutes. Question: What will you say on the retrieval call, and what is your delay plan? [18] [21]

Consultant-level model answer. “I call retrieval when the child may need support my hospital cannot provide. I do not wait for every local option to fail. I give the age, working weight, personal baseline and device details. I describe the PAT pattern, current ABCDE findings and direction of change. I give each timed action, its intended result, actual response and any harm. I state the unresolved differential, access, monitoring and likely support needed. I describe our staffing and equipment limits, weather and transport time. I include family, communication and relevant safeguarding needs. I ask for the safest destination, retrieval team and remote treatment advice. We agree monitoring, repeated assessment and clear failure markers. We also agree airway and circulation contingencies, named responsibilities and read-back. I package the child and device safely and update the family honestly. Referral thresholds, escorts, transport mode and receiving services remain local.” [18] [21]

Probing follow-up. “Should you wait until the child is more stable before calling?” A strong answer is: “No. The delay makes early consultation more valuable. Expertise, destination planning, team mobilisation and local contingencies can develop while I stabilise the child. Transfer can worsen airway, temperature, access and physiology. I therefore prepare and reassess through every movement.” [21]

Common weak answer. “I will stabilise fully, then ring PICU.” Full stabilisation may require support the hospital does not have. Sequential escalation loses time and increases transport risk. [12] [21]

Escalation branch. If retrieval is activated early with a delay plan, reveal the skin findings in Question 11. If the candidate says only “ISBAR,” ask what would be lost about baseline, response endpoints, local limits, transport constraints and named ownership. [18] [21]

Question 11 — Safeguarding during resuscitation

Stimulus update. During exposure, you find several patterned bruises of different appearances on protected areas. The explanation changes between adults and is not developmentally plausible. The bruises do not explain all the physiological deterioration. Question: What do you do now? [20]

Consultant-level model answer. “I continue physiological stabilisation and protect the child’s immediate safety. Safeguarding work proceeds in parallel. I objectively record each bruise’s location, size, shape and colour. I record the child’s spontaneous words without inferring a mechanism. I ask only open, clinically necessary and non-leading questions. I avoid repeated interviews. When safe and required by local policy, I preserve clothing or other evidence. I clarify who is present and whether contact or discharge creates immediate danger. I inform the senior clinician and active safeguarding team. I follow the jurisdiction’s reporting and information-sharing pathway. I speak directly to the child through the preferred method. If needed, I use a professional non-family interpreter. NICE NG76 Child abuse and neglect is an England-and-Wales source for child-centred communication and referral. Mandatory routes still differ by jurisdiction.” [17] [20]

Probing follow-up. “Will you confront the adult or obtain a full forensic history first?” A strong answer is: “No. I avoid confrontation that may increase risk or contaminate disclosure. I do not perform an unnecessary forensic interview, and I do not delay ABCDE. I protect the child, record accurately and involve trained safeguarding professionals. I follow the active legal pathway.” [20]

Common weak answer. “The bruises are probably from disability equipment. Safeguarding can wait until the respiratory diagnosis is known.” This is unsupported reassurance. It can lose evidence and leave immediate danger unaddressed. It also forces one cause to explain every finding. [16] [20]

Escalation branch. If stabilisation and safeguarding run together, ask for the transfer handover in Question 12. If the candidate ignores the bruising or stops resuscitation to investigate it, require two parallel plans. Each plan must have a named clinical or safeguarding lead. [18] [20] [21]

Question 12 — Structured handover with read-back

Stimulus update. Retrieval accepts the child. A second clinician must take over locally while you speak with the retrieval consultant. Question: Give a handover that prevents information loss. [18] [21]

Consultant-level model answer. “I start with identity and baseline. This is a four-year-old with an estimated weight that I state. The child has severe neurodisability, gaze-based communication, a gastrostomy and nocturnal non-invasive ventilation. I give the usual baseline and emergency plan. I state that the initial PAT showed abnormal Appearance and Work of Breathing. Circulation to Skin was initially normal. The child then developed respiratory failure, abnormal skin circulation, weak pulses and altered consciousness. A five-minute convulsion occurred with clinically dangerous low glucose. I give the current ABCDE findings and direction of change. I list every intervention with its time, route, intended endpoint, actual response and adverse effect. I include the glucose recheck, key results, pending tests and threat-based differential. I describe access, devices and current support. I give the parent’s concern and current understanding. I hand over the patterned bruising, objective documentation and activated safeguarding pathway. I state local limits, retrieval time and destination. I name the next failure marker and action. Finally, I name who owns the child, pending results and contingency, then request read-back.” [15] [18] [20] [21] [23]

Probing follow-up. “Why not require one mnemonic?” A strong answer is: “I use a structured process and read-back to reduce omissions. The exact mnemonic matters less than preserving required content, responsibility and contingency in the local system. Handoff evidence supports standardisation. It does not prove one universal mnemonic for every retrieval setting.” [18] [21]

Common weak answer. “Sick child, likely sepsis, improved after treatment, accepted by PICU.” This omits baseline, time course, physiological pattern, treatment response and harm. It also loses alternative causes, devices, family concern, safeguarding, transport risk and ownership. [16] [18] [21]

Escalation branch. If the handover includes baseline, direction of change, response and contingency, move to disposition in Question 13. If not, interrupt: “What will trigger intubation or an earlier transport change, and who owns that decision?” [18] [21]

Question 13 — Disposition matched to available rescue

Stimulus update. The child is more interactive, and perfusion has improved. Respiratory support continues, and neither physiology nor behaviour has returned to baseline. Retrieval offers transfer to a centre with paediatric critical care. A local bed is also available. Question: Where should the child go, and why? [12] [15] [21]

Consultant-level model answer. “I choose transfer to the centre with paediatric critical care. This child has had multisystem failure, a seizure and a metabolic threat. Improvement is incomplete, respiratory support continues and recurrence remains possible. Local rescue support is limited. One better set of observations does not erase the preceding deterioration. I continue stabilisation and reassessment until responsibility has transferred. I ensure the receiving service can manage the devices and safeguarding needs. I document the transport contingency. Discharge is not defensible in this branch. In a genuinely lower-acuity future case, I would require sustained acceptable progress before discharge. I would resolve immediate threats and important high-harm concerns. I would address caregiver concern, give specific warning signs and urgency, and provide a clear access route. I would arrange review, name the owner of pending results and confirm understanding. NICE fever in under 5s guidance is one England-and-Wales example of specific safety-net content. It does not set a universal follow-up interval.” [15] [19] [21]

Probing follow-up. “Is ‘return if worried’ enough?” A strong answer is: “No. I specify which changes to watch for, how urgently to act and where to seek help. I state the planned review and who owns pending results. I also address language, distance, transport or cost barriers. No leaflet, video or interval is best for every child.” [17] [19]

Common weak answer. “The numbers are better. I will admit locally overnight and review in the morning.” This ignores ongoing support, recent deterioration, transport delay and personal baseline. It also ignores the ability to rescue recurrence. [12] [15] [21]

Escalation branch. If the candidate chooses transfer, ask the evidence challenge in Question 14 while retrieval is pending. If they choose local admission, restate the worst prior physiology. Ask which rescue services are guaranteed overnight. [12] [21]

Question 14 — Evidence limits across settings

Stimulus update. A trainee says, “PAT, PEWS and paediatric shock protocols are validated, so one universal pathway should be used.” Question: Do you agree? [3] [8] [9] [13] [14]

Consultant-level model answer. “I reject the universal claim, but I retain disciplined systems. PAT provides a useful rapid first impression. Its reliability and validity vary with rater, training, domain, setting, exclusions and outcome. I cannot quote one transferable sensitivity, specificity, AUROC or kappa. Evidence is sparse in neonates, remote assessment and complex baselines. PEWS tools also differ. Their performance depends on chart calibration, complete observations, staffing, escalation and governance. EPOCH did not reduce all-cause hospital mortality. Caregiver concern has a strong single-centre association with critical illness, not a universal likelihood ratio. Pulse oximetry may overestimate oxygenation in darker skin, and there is no validated correction factor. Capillary refill is technique-sensitive. Canonical AAP PAT excludes it. The Children’s Health Queensland rapid-assessment sheet is explicitly a local adaptation. I also keep shock and fluid evidence attached to its setting. FEAST found bolus harm in its African severe-febrile-illness population. I do not export that result or a high-resource protocol without considering population, shock type and available rescue. Contemporary sepsis recommendations make the same distinctions.” [2] [3] [6] [8] [9] [11] [13] [14] [15]

Probing follow-up. “How do you compare high- and low-resource guidance?” A strong answer is: “I keep the population and available support beside every rule. WHO ETAT is mainly for low-resource hospitals and non-specialists. I do not blend it with tertiary critical-care pathways. I also keep age-reference intervals, treatment targets, local escalation triggers and personal baselines separate. They answer different questions and do not form one ‘normal observations’ table.” [5] [13] [14]

Common weak answer. “Evidence is limited, so clinical judgement is better than tools.” This creates a false choice. Safe care uses PAT, measured assessment, local PEWS and local pathways within trained teams. It also requires reassessment, caregiver escalation and governance. The clinician neither surrenders judgement to a score nor abandons standardisation. [1] [8] [9] [15]

Escalation branch. If the candidate preserves the evidence boundaries, proceed to Question 15. If they quote one universal threshold or protocol, ask for its issuer, population, clinical phase, setting, available support and stop endpoint. Do not allow the answer to continue until these are stated. [5] [6] [13] [14]

Question 15 — Regional operations and board distinctions

Stimulus update. Retrieval asks how this formative viva relates to different jurisdictions and training systems. Question: What differs between regions and boards? [18] [21]

Consultant-level model answer. “I separate shared physiology from local operational rules. In Australia and Aotearoa New Zealand, ANZCOR Guideline 12.2 is the current binational PALS source. Observation charts, retrieval and safeguarding routes still vary by service and jurisdiction. Australia’s national deterioration standard requires locally agreed escalation, including worry. In the UK, Resuscitation Council UK 2025 PLS guides immediate resuscitation. NHS England National PEWS is a separate recognition-and-response system for general wards in England. In the US, AHA/AAP 2025 PALS provides national resuscitation science. Transfer agreements and safeguarding procedures remain local or state-based. In Canada, transport and child-welfare procedures remain provincial, territorial and service-specific. National specialty competencies still map deterioration and transfer. For every rule, I name the active source, setting and limits. I do not borrow another region’s threshold.” [8] [13] [20] [21]

Probing follow-up. “Separate curriculum, examination, workplace assessment and accreditation.” A strong answer is: “I separate each function. The RACP current PREP curriculum remains the 2026 curriculum. The RACP specialty-development page describes implementation. The renewed standards place new first-year trainees into the renewed curriculum from 2027. RCPCH Progress+ is a curriculum. The public MRCPCH Clinical station description describes examination delivery. The ABP Content Outline classifies written examinations. ABP Core EPAs are workplace activities. ACGME Pediatrics Milestones assess development within accreditation, not ABP certification. The RCPSC Pediatrics Competencies define competencies. The stage-specific Pediatrics EPAs describe entrusted activities by stage. These frameworks remain distinct. This MedVellum viva uses none of their confidential marks, timing or pass standards.” [18] [21]

Common weak answer. “This is a ten-minute RACP or MRCPCH viva, and the same algorithm is examined everywhere.” The duration is invented. RACP and MRCPCH use different assessments, and curricula are not examinations. ABP is not ACGME. Local pathways cannot be collapsed into one operational standard. [8] [18] [21]

Escalation branch. A pass-level close is: “PAT gives me the child’s current physiological first impression, not a diagnosis. I declare threats and treat them during age-adapted ABCDE. I define improvement across several findings and repeat from A. I use caregiver concern and the child’s personal baseline. I escalate before the child needs support my service cannot provide. I keep every threshold and pathway attached to its source and population. I state the phase. I also state the jurisdiction.” [1] [3] [8] [12] [15] [21]

If the candidate cannot give that synthesis, return to the first point where a score, diagnosis or apparent response displaced the child’s direction of change. [1] [3] [8] [12] [15] [21]