Master Child Health (Paediatrics)
for AMC Cat 1

What the AMC Cat 1 Tests in Child Health (Paediatrics)

Child Health (Paediatrics) on the AMC Cat 1 exam tests the ability to manage common acute and chronic paediatric presentations across all ages, from neonates to adolescents. Candidates must demonstrate knowledge of age-specific physiology, developmental milestones, immunisation schedules, and evidence-based guidelines for conditions like bronchiolitis, asthma, gastroenteritis, febrile seizures, and neonatal jaundice. The exam emphasises recognition of red flags (e.g., sepsis, meningitis, abusive head trauma), appropriate investigation (e.g., lumbar puncture, blood cultures, urine dipstick), and safe prescribing (e.g., weight-based doses, avoiding contraindicated drugs). Clinical reasoning includes distinguishing self-limiting illness from emergencies, applying thresholds for admission (e.g., respiratory rate, oxygen saturation), and understanding UK/Australian consensus guidelines (e.g., NICE, RCH Melbourne).

High-Yield Concepts

• Neonatal Resuscitation (NLS Algorithm): Start with drying, warming, and airway positioning. If gasping or heart rate <100 bpm, initiate positive pressure ventilation (PPV) with air (21% O2) via T-piece or bag-mask. If HR <60 bpm despite 30 seconds of effective PPV, intubate and commence chest compressions (3:1 ratio). IV/IO adrenaline (0.01-0.03 mg/kg, 1:10,000) if no response. Do not routinely suction meconium-stained liquor unless airway obstructed.
• Febrile Seizure Management: Simple febrile seizure: generalised, <15 minutes, no recurrence within 24 hours. No routine investigations if well-appearing; treat underlying infection (e.g., otitis media, UTI). Complex febrile seizure: focal, prolonged >15 minutes, or multiple in 24 hours—consider EEG, neuroimaging, and lumbar puncture (if meningeal signs). First-line abortive: buccal midazolam 0.5 mg/kg (max 10 mg) or rectal diazepam 0.5 mg/kg. No long-term prophylaxis needed.
• Bronchiolitis (NICE Guideline NG9): Diagnosis: first episode of wheeze/crackles in infant <12 months, with coryza and respiratory distress. Severity: mild (SpO2 >92%, mild recession), moderate (SpO2 90-92%, grunting, nasal flaring), severe (SpO2 <90%, apnoea, poor feeding). Management: supplemental O2 to target SpO2 >92%, nasogastric/IV fluids if unable to feed. No routine bronchodilators, steroids, or antibiotics. Indications for HDU/PICU: persistent SpO2 <92%, rising CO2, apnoea.
• Paediatric Asthma Exacerbation (BTS/SIGN 2023): Acute severe: unable to complete sentences, respiratory rate >40/min (age 2-5), SpO2 <92%, PEF 33-50% predicted. First-line: back-to-back salbutamol (2.5-5 mg nebulised) with ipratropium (250 mcg nebulised). Add IV magnesium sulfate (40 mg/kg over 20 min) if poor response. Life-threatening: silent chest, cyanosis, exhaustion. IV salbutamol (15 mcg/kg bolus then 1-5 mcg/kg/min) or IV aminophylline (5 mg/kg loading) considered. Oral prednisolone (1-2 mg/kg, max 40 mg) for 3 days.
• Gastroenteritis and Dehydration Assessment: Clinical dehydration signs: dry mucous membranes, sunken eyes, reduced skin turgor, prolonged capillary refill (>2 sec), abnormal breathing pattern. Severe dehydration (>10% loss): lethargic, cold peripheries, oliguria, tachycardia. Management: mild-moderate—oral rehydration solution (ORS) 50-100 mL/kg over 4 hours; severe—IV bolus 20 mL/kg 0.9% saline (repeat if needed). Ondansetron (0.15 mg/kg IV/PO) for vomiting. No routine antibiotics; stool culture if bloody or travel history.
• Neonatal Jaundice (NICE Guideline CG98): Assess risk factors: gestational age <38 weeks, visible jaundice <24 hours, sibling with phototherapy, ABO/Rh incompatibility. Use transcutaneous bilirubin (TcB) or serum bilirubin (SBR) plotted on treatment threshold graph. Phototherapy thresholds: term infant day 1—SBR >100 μmol/L; day 3—>250 μmol/L. Exchange transfusion if SBR > threshold for phototherapy by 50 μmol/L or signs of bilirubin encephalopathy. Treat pathological causes: G6PD deficiency, sepsis, biliary atresia (conjugated hyperbilirubinaemia).
• Urinary Tract Infection in Children (NICE CG54): Diagnosis: clean-catch urine for dipstick (nitrites, leucocytes) and culture. <3 months: urgent referral, IV antibiotics (e.g., cefotaxime 50 mg/kg TDS). >3 months with pyelonephritis (fever >38°C, loin pain): oral cephalexin (25 mg/kg TDS) or co-amoxiclav (30 mg/kg TDS) for 7-10 days. Lower tract: trimethoprim (4 mg/kg BD) for 3 days. Imaging: renal ultrasound if atypical (e.g., poor urine flow, recurrent UTI, non-E. coli). DMSA scan if recurrent pyelonephritis.
• Kawasaki Disease Diagnosis and Treatment: Diagnostic criteria: fever >5 days plus 4/5: bilateral conjunctivitis, strawberry tongue/cracked lips, cervical lymphadenopathy (>1.5 cm), polymorphous rash, extremity changes (oedema, desquamation). Incomplete Kawasaki: fever plus <4 criteria but echocardiogram shows coronary artery abnormalities. Treatment: IVIG 2 g/kg single dose (within 10 days) plus aspirin 30-50 mg/kg/day (acute phase) then 3-5 mg/kg/day (antiplatelet). Monitor for coronary artery aneurysms with echocardiogram at 2 weeks and 6 weeks.

Common Traps in Child Health (Paediatrics) Questions

• Confusing simple and complex febrile seizures—remember simple does not require routine LP or EEG; complex does.
• Giving bronchodilators or steroids for bronchiolitis—first-line is supportive care only unless there is a strong personal/family history of atopy suggesting asthma.
• Using adult-sized equipment or doses for paediatric resuscitation—always use Broselow tape or weight-based calculations (e.g., 0.1 mL/kg of 1:10,000 adrenaline).
• Forgetting to plot neonatal jaundice on the treatment threshold graph—phototherapy and exchange transfusion thresholds are time-specific (hours of life) and gestation-specific.
• Assuming all wheeze in infants <12 months is asthma—bronchiolitis is far more common; only consider asthma if recurrent episodes and atopic background.
• Starting oral antibiotics for UTI in infants <3 months without first performing a septic screen and giving IV antibiotics—this age group requires urgent parenteral treatment.

How to Revise Child Health (Paediatrics) for the AMC Cat 1

Prioritise acute presentations: respiratory distress (bronchiolitis, asthma, pneumonia), febrile child (sepsis, meningitis, UTI, Kawasaki), dehydration/gastroenteritis, and neonatal jaundice. Know NICE and RCH Melbourne guidelines for thresholds (e.g., bilirubin, SpO2, respiratory rate). Practise weight-based dosing calculations (e.g., paracetamol 15 mg/kg, ibuprofen 10 mg/kg, adrenaline 0.01 mg/kg). Questions often present a clinical scenario with vital signs, then ask for the next best step (e.g., 'What is the most appropriate management?')—avoid jumping to antibiotics or imaging without assessing severity. Master the 'red flag' signs for non-accidental injury (e.g., retinal haemorrhage, rib fractures, inconsistent history). Focus on age-specific normal values: heart rate, respiratory rate, blood pressure (e.g., systolic BP >90 + 2 x age in years for children >1 year).

Practise it: MedLumen has 100 Child Health (Paediatrics) questions for the AMC Cat 1, each with a full explanation and references.